WO2023238937A1 - Device for observing hot-dipped steel sheet, and method for observing hot-dipped steel sheet - Google Patents

Device for observing hot-dipped steel sheet, and method for observing hot-dipped steel sheet Download PDF

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Publication number
WO2023238937A1
WO2023238937A1 PCT/JP2023/021564 JP2023021564W WO2023238937A1 WO 2023238937 A1 WO2023238937 A1 WO 2023238937A1 JP 2023021564 W JP2023021564 W JP 2023021564W WO 2023238937 A1 WO2023238937 A1 WO 2023238937A1
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Prior art keywords
hot
plating layer
light
observation
dip
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PCT/JP2023/021564
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French (fr)
Japanese (ja)
Inventor
哲也 鳥羽
保明 河村
順 中川
進太朗 上村
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日本製鉄株式会社
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Priority to JP2023560797A priority Critical patent/JP7488502B2/en
Publication of WO2023238937A1 publication Critical patent/WO2023238937A1/en

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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection

Definitions

  • the present invention relates to a hot-dip-coated steel plate observation device and a hot-dip-coated steel plate observation method.
  • Zn-Al-Mg hot-dip galvanized steel sheets which have higher corrosion resistance than hot-dip galvanized steel sheets, are widely used in various manufacturing industries such as building materials, home appliances, and automobiles, and their usage has been increasing in recent years. .
  • the ink may reduce the corrosion resistance of the hot-dip plating layer.
  • the durability of the design is excellent, the thickness of the hot-dip plating layer at the grinding point is significantly reduced, which inevitably leads to a decrease in corrosion resistance and a decrease in plating properties. There are concerns.
  • Patent Document 1 a technique has been proposed for displaying letters, designs, etc. on the surface of the plating layer of a Zn-Al-Mg hot-dip plated steel sheet.
  • the Zn-Al-Mg hot-dip plated steel sheet described in Patent Document 1 has linear parts, curved parts, figures, numbers, symbols, characters, or these on the surface of the plating layer without ink application or grinding. This allows the intentional pattern formed by the combination to be visible, but depending on the condition of the light rays that enter the surface of the plating layer, that is, the angle of incidence of the environmental light, it may become difficult to see the intentional pattern. .
  • Zn-Al-Mg hot-dip plated steel sheets have a satin pattern on the surface of the plating layer, and the satin pattern itself is recognized as having commercial value. Therefore, in Zn-Al-Mg hot-dipped steel sheets, the appearance of the plating layer is the subject of quality evaluation. However, the impression of the satin pattern of the plating layer when viewed may change depending on the incident angle of environmental light. Therefore, there is a need for a means and method for confirming the satin pattern of a plating layer under certain conditions even in a plated steel sheet in which no pattern is formed.
  • the present invention has been made in view of the above-mentioned circumstances, and provides a hot-dip galvanized steel plate observation device that enables observation of the surface of a plating layer of a Zn-Al-Mg hot-dip galvanized steel plate under certain conditions.
  • the object of the present invention is to provide a method for observing hot-dipped steel sheets.
  • the present invention employs the following configuration.
  • [1] Observe the surface of the plating layer of a hot-dip plated steel sheet having a plating layer containing, in average composition, Al: 0 to 90% by mass, Mg: 0 to 10% by mass, and the remainder containing Zn and impurities.
  • a light-shielding box that can be placed in contact with the plating layer and blocks environmental light from entering the surface of the plating layer; an annular light source having an observation hole installed inside the light-shielding box;
  • the light-shielding box includes an opening for exposing the surface of the plating layer inside the light-shielding box, and an observation window disposed opposite to the opening,
  • the annular light source is arranged between the opening and the observation window, and irradiates light at an irradiation angle of 35° to 80° toward an observation area on the surface of the plating layer.
  • the annular light source includes an annular support having the observation hole, and a plurality of light sources disposed on an inner circumferential surface of the annular support and along a circumferential direction of the inner circumferential surface.
  • a light-shielding box that can be placed on the plating layer and blocks environmental light from entering the surface of the plating layer; an annular light source having an observation hole installed inside the light-shielding box;
  • the light-shielding box includes an opening for exposing the surface of the plating layer inside the light-shielding box, and an observation window disposed opposite to the opening,
  • the annular light source is disposed between the opening and the observation window, and emits illumination at an irradiation angle of 35° to 80° toward an observation area on the surface of the plating layer located directly below the opening.
  • the annular light source includes an annular support having the observation hole, and a plurality of light sources disposed on the inner peripheral surface of the annular support along the circumferential direction of the inner peripheral surface, An observation device for a hot-dipped steel plate, wherein the observation window is arranged on a center line passing through the center of the observation hole.
  • the hot-dip plating layer has an average composition of Al: 4 to 22% by mass, Mg: 1.0 to 10% by mass, and the remainder contains Zn and impurities,
  • the surface appearance of the hot-dip plating layer is satin-like, Aim at the observation area on the surface of the hot-dip plating layer while blocking environmental light whose incident angle to the observation area on the surface of the hot-dip plating layer is within a range of 0° to less than 35°, more than 80° to 90° or less.
  • a method for observing a hot-dip plated steel sheet comprising: observing reflected light from the observation area with respect to the illumination light in the normal direction of the surface of the hot-dip plated layer.
  • the hot-dip plating layer has an average composition of Al: 4 to 22% by mass, Mg: 1.0 to 10% by mass, and the remainder contains Zn and impurities, comprising a pattern part and a non-pattern part arranged on the hot-dip plating layer,
  • a hot-dip plated steel sheet in which the exposed proportion of the Al phase in the patterned portion is less than 30 area %, and the exposed proportion of the Al phase in the non-patterned portion is 30 area % or more; Aim at the observation area on the surface of the hot-dip plating layer while blocking environmental light whose incident angle to the observation area on the surface of the hot-dip plating layer is within a range of 0° to less than 35°, more than 80° to 90° or less.
  • the hot-dip plating layer has an average composition of Al: 4 to 22% by mass, Mg: 1.0 to 10% by mass, and the remainder contains Zn and impurities, comprising a pattern part and a non-pattern part arranged on the hot-dip plating layer,
  • a hot-dip plated steel sheet wherein the patterned portion has an arithmetic mean surface roughness Sa of less than 1 ⁇ m, and the non-patterned portion has an arithmetic mean surface roughness Sa of 1 ⁇ m or more; Aim at the observation area on the surface of the hot-dip plating layer while blocking environmental light whose incident angle to the observation area on the surface of the hot-dip plating layer is within a range of 0° to less than 35°, more than 80° to 90° or less.
  • the hot-dip plating layer has an average composition of Al: 4 to 22% by mass, Mg: 1.0 to 10% by mass, and the remainder contains Zn and impurities,
  • the hot-dip plating layer includes a pattern part and a non-pattern part, Reflection of light from the pattern portion in the normal direction and reflection from the non-pattern portion in the normal direction with respect to incident light having an incident angle in the range of 0° to less than 90° with respect to the normal direction of the steel plate surface.
  • IPH Reflection intensity of a pattern part in the normal direction for incident light with an incident angle of 0° to less than 35°
  • IBH Reflection intensity of a non-pattern part in the normal direction to incident light with an incident angle of 0° to less than 35°
  • IPM Incident Reflection intensity of the pattern part in the normal direction for incident light at an angle of 35° to 80°IBM: Reflection intensity of the non-pattern part in the normal direction to incident light at an incident angle of 35° to 80°IPL: Incident angle of more than 80° Reflection intensity of the pattern portion in the normal direction for incident light at an angle of less than 90°
  • IBL Reflection intensity of the non-pattern portion in the normal direction for incident light at an incident angle of more than 80° to less than 90°.
  • the surface of the plating layer of the hot-dip galvanized steel sheet can be inspected even in environments where the environmental light conditions are unstable, such as outdoors. This makes it possible to observe the image without being affected by it. This makes it easier to observe patterns such as letters and designs on the surface of the plating layer, and also allows stable observation of the satin pattern of the plating layer.
  • the present invention can be suitably applied to a plating layer in which the visibility of patterns such as letters and designs changes depending on the angle of incidence of light rays on the plating layer.
  • FIG. 1 is a schematic diagram illustrating the relationship between the incident angle of illumination light and the visibility of a pattern portion.
  • FIG. 2 is a schematic cross-sectional view showing an observation device that is an embodiment of the present invention.
  • FIG. 3 is a schematic plan view showing an observation device that is an embodiment of the present invention.
  • FIG. 4 is a schematic diagram illustrating illumination light emitted from an annular light source toward an observation area.
  • FIG. 5 is a schematic diagram showing an inspection device according to an embodiment of the present invention.
  • the surface of the plating layer can be formed with straight parts, curved parts, figures, numbers, symbols, and characters.
  • an intentional pattern portion can be formed by combining these.
  • the intentional pattern portion formed on the plating layer is visually recognized when the reflected light reflected from the surface of the plating layer enters the human retina. Therefore, the visibility of the pattern portion on the surface of the plating layer may change depending on the angle of incidence of light incident on the surface of the plating layer. That is, under environmental light incident from an unspecified direction, the pattern portion formed on the plating layer may become difficult to see.
  • the inventors of the present invention conducted extensive research and found that the coating layer of Zn-Al-Mg hot-dipped steel sheet can be coated under certain conditions unaffected by environmental light, that is, only from an irradiation angle of 35° to 80°. We have discovered a means and method for observing under an irradiated light source environment, and have completed the present invention.
  • an observation device for a hot-dip-coated steel sheet may be referred to as an "observation device,” and a method for observing a hot-dip-coated steel sheet may be referred to as an "observation method.”
  • the hot-dip galvanized steel sheet is a so-called Zn-Al-Mg hot-dip galvanized steel sheet, which has a plating layer containing Al: 0 to 90% by mass, Mg: 0 to 10% by mass, and the remainder containing Zn and impurities. It is.
  • the plating layer preferably contains, in average composition, Al: more than 0 to 90% by mass, Mg: more than 0 to 10% by mass, and the balance may be composed of Zn and impurities. : 4 to 22% by mass, Mg: 1 to 10% by mass, and the remainder may consist of Zn and impurities.
  • the plating layer may further contain Si: 0.0001 to 2% by mass in the average composition, Ni, Ti, Zr, Sr, Fe, Sb, Pb, Sn, Ca, Co, Mn. , P, B, Bi, Cr, Sc, Y, REM, Hf, and C in a total amount of 0.0001 to 2% by mass.
  • the total amount of the plating layer deposited on both sides of the steel plate may be 30 to 600 g/m 2 .
  • such a plating layer includes an [Al phase] and [ternary eutectic structure of Al/Zn/MgZn 2 ] in the metal structure.
  • [Al phase] is included in the matrix of [ternary eutectic structure of Al/Zn/MgZn 2] .
  • [MgZn 2 phase] or [Zn phase] may be included in the matrix of [ternary eutectic structure of Al/Zn/MgZn 2 ].
  • Si when Si is contained, [Mg 2 Si phase] may be included in the matrix of [ternary eutectic structure of Al/Zn/MgZn 2 ].
  • Al/Zn/MgZn 2 ternary eutectic structure is a ternary eutectic structure of an Al phase, a Zn phase, and an intermetallic compound MgZn 2 phase.
  • the Al phase forming this ternary eutectic structure is, for example, the "Al" phase at high temperatures in the ternary equilibrium phase diagram of Al-Zn-Mg (an Al solid solution containing Zn, and a small amount of Mg ), and normally appears separated into a fine Al phase and a fine Zn phase at room temperature.
  • the Zn phase in the ternary eutectic structure is a Zn solid solution in which a small amount of Al is dissolved in solid solution, and in some cases, a further small amount of Mg is dissolved in solid solution.
  • the MgZn two phase in the ternary eutectic structure is an intermetallic compound phase that exists in the vicinity of about 84% by mass of Zn in the Zn-Mg binary system equilibrium phase diagram.
  • Al phase is a phase that appears like an island with clear boundaries in the matrix of the above-mentioned ternary eutectic structure, and is the "Al" phase at high temperature in the ternary equilibrium phase diagram of Al-Zn-Mg. (It is an Al solid solution containing Zn as a solid solution and contains a small amount of Mg), and normally separates into a fine Al phase and a fine Zn phase at room temperature. [Al phase] can be clearly distinguished from the Al phase forming the above-mentioned ternary eutectic structure by microscopic observation.
  • [MgZn 2 phase] is a phase that appears like an island with clear boundaries in the matrix of the above-mentioned ternary eutectic structure, and may actually contain a small amount of Al in solid solution. As far as we can see from the phase diagram, it is thought that this phase does not contain any other additive elements, or even if they do, the amount is extremely small.
  • [MgZn two- phase] and the MgZn two- phase forming the above-mentioned ternary eutectic structure can be clearly distinguished by microscopic observation.
  • [Zn phase] is a phase that appears like an island with clear boundaries in the matrix of the above-mentioned ternary eutectic structure, and may actually contain a small amount of Al or a small amount of Mg in solid solution. As far as we can see from the phase diagram, it is thought that this phase does not contain any other additive elements, or even if they do, the amount is extremely small. [Zn phase] can be clearly distinguished from the Zn phase forming the above-mentioned ternary eutectic structure by microscopic observation.
  • [Mg 2 Si phase] is a phase that appears like an island with clear boundaries in the solidified structure of the Si-added plating layer. As far as we can see from the phase diagram, it is thought that Zn, Al, and other additive elements are not solidly dissolved in the [Mg 2 Si phase], or even if they are solidly dissolved, the amount is extremely small. [Mg 2 Si phase] can be clearly distinguished from other phases in the hot-dip plating layer by microscopic observation.
  • the plating layer containing the above chemical components When the plating layer containing the above chemical components is formed by hot-dip plating, it has the above-mentioned metal structure. As a result, the plating layer of the hot-dip plated steel sheet exhibits a satin-like appearance.
  • the plating layer may have a patterned portion and a non-patterned portion.
  • the pattern portion and the non-pattern portion may be arranged to have a predetermined shape.
  • the pattern portion may be arranged to have a shape of any one of a straight line portion, a curved portion, a dot portion, a figure, a number, a symbol, or a character, or a combination of two or more of these.
  • the pattern portions may be arranged in an intentional shape. It is preferable that the straight portions and curved portions in the pattern portion have a width that can be visually recognized, and each have a length of 1 mm or more.
  • the dot portion in the pattern portion preferably has an equivalent circle diameter of 1 mm or more and less than 10 mm, and more preferably consists of a plurality of regularly arranged dots.
  • the pattern portion is a figure, number, symbol, or character, it is preferable that these shapes can be visually recognized. By showing such dimensions and shape, it can be said that the shape was intentionally formed.
  • the non-pattern portion is an area other than the pattern portion. Further, even if the shape of the pattern part is partially missing, such as a missing dot, it is acceptable as long as it can be recognized as a whole. Further, the non-pattern portion may have a shape that borders the pattern portion.
  • the area ratio occupied by the pattern part on the surface of the hot-dip plating layer is significantly smaller than that of the non-pattern part.
  • the area ratio occupied by the pattern portion on the surface of the hot-dip plating layer is 30% or less, 25% or less, 20% or less, or 15% or less.
  • a hot-dip plated steel plate includes a steel plate and a hot-dip plated layer formed on the surface of the steel plate.
  • the average composition of the hot-dip plating layer is Al: 4 to 22% by mass, Mg: 1.0 to 10% by mass, and the remainder contains Zn and impurities.
  • the hot-dip plated steel sheet includes a pattern portion and a non-pattern portion arranged in the hot-dip plating layer.
  • the method for observing a hot-dip galvanized steel sheet in the first example provides a hot-dip galvanized steel sheet in which the exposed proportion of the Al phase in the patterned part is less than 30 area %, and the exposed proportion of the Al phase in the non-patterned part is 30 area % or more. do.
  • Illumination light with an irradiation angle in the range of 35° to 80° is irradiated.
  • a hot-dip plated steel plate includes a steel plate and a hot-dip plated layer formed on the surface of the steel plate.
  • the average composition of the hot-dip plating layer is Al: 4 to 22% by mass, Mg: 1.0 to 10% by mass, and the remainder contains Zn and impurities.
  • the hot-dip plated steel sheet includes a pattern portion and a non-pattern portion arranged in the hot-dip plating layer.
  • the method for observing a hot-dip-coated steel sheet in the second example provides a hot-dip-coated steel sheet in which the arithmetic mean surface roughness Sa in the pattern portion is less than 1 ⁇ m and the arithmetic mean surface roughness Sa in the non-pattern portion is 1 ⁇ m or more.
  • Illumination light with an irradiation angle in the range of 35° to 80° is irradiated.
  • reflected light is observed from an observation area for the illumination light in the normal direction of the surface of the plating layer.
  • the plating layer of the first example above has a satin-like appearance as a whole, and due to the difference in metallic luster between the patterned part and the non-patterned part, and the difference in color tone due to the difference in metallic luster, the plating layer has a patterned part of a predetermined shape. can be visually distinguished from non-pattern areas. The same holds true when observing the plating layer of the second example above.
  • a plating layer including a patterned portion and a non-patterned portion
  • a pattern in the normal direction for incident light having an incident angle in the range of 0° to less than 90° with respect to the normal direction of the steel sheet surface.
  • the plating layer may be such that the relationship between the reflected light of the non-patterned part and the reflected light of the non-patterned part in the normal direction satisfies the following formulas (1) and (2).
  • I PH Reflection intensity of the pattern portion in the normal direction for incident light with an incident angle of 0° to less than 35°
  • I BH Reflection intensity of the non-pattern part in the normal direction for incident light with an incident angle of 0° to less than 35°
  • I PM Reflection intensity of the pattern portion in the normal direction for incident light at an incident angle of 35° to 80°
  • I BM Reflection intensity of a non-pattern part in the normal direction for incident light at an incident angle of 35° to 80°
  • I PL Reflection intensity of the pattern portion in the normal direction for incident light with an incident angle of more than 80° to less than 90°
  • I BL Reflection intensity of the non-pattern part in the normal direction for incident light with an incident angle of more than 80° to less than 90°
  • the hot-dip plated steel plate in the third example includes a steel plate and a hot-dip plated layer formed on the surface of the steel plate, and the average composition of the hot-dip plated layer is Al: 4 to 22% by mass, Mg: 1 .0 to 10% by mass, with the remainder containing Zn and impurities. Further, the hot-dip plating layer includes the above-described pattern portion and non-pattern portion.
  • the plating layer of the third example above has a satin-like appearance as a whole, and due to the difference in the reflected light intensity of the patterned part and the reflected light intensity of the non-patterned part, the patterned part of the predetermined shape is different from the non-patterned part. It is now possible to distinguish and visually recognize it.
  • the plating layers of the first example, the second example, and the third example have an incident angle in the range of 35° to 80° with respect to the normal direction of the plating layer.
  • the pattern portion becomes easier to see.
  • FIG. 1(b) when the incident angle with respect to the normal direction of the plating layer is outside the range of 35° to 80°, and when the plating layer is viewed from the normal direction, , the pattern part becomes difficult to see.
  • hot-dip plated steel plate to be observed in this embodiment is not limited to the plated steel plate described above.
  • the observation device 1 of this embodiment includes a light-shielding box 2 and an annular light source 3 installed inside the light-shielding box 2.
  • the light-shielding box 2 can be placed on and in contact with the plating layer 10a of the hot-dip plated steel plate 10. By placing the light-shielding box 2 in contact with the plating layer 10a, a part of the plating layer 10a is covered.
  • the plating layer 10a covered by the light shielding box 2 blocks the incidence of environmental light. It is preferable that the light-shielding box 2 shields environmental light having an incident angle with respect to the observation area K, which will be described later, within a range of 0° to less than 35° and more than 80° to 90° or less. Further, considering the incidence of environmental light from the observation window 2b, which will be described later, it is preferable to block the environmental light having an incident angle of 3° or more.
  • patterns such as letters and designs expressed on the surface of the plating layer can be visually recognized.
  • pattern areas such as letters and designs on the surface of the plating layer are mainly composed of minute slopes with an angle of inclination of 17° to 40° with respect to the steel plate surface, and non-pattern areas are mainly outside the above range.
  • the shape of the light-shielding box 2 is not limited as long as it has a hollow box shape.
  • the shape of the light shielding box 2 may be, for example, a rectangular parallelepiped, a cylinder, or a polygonal column.
  • the inner surface of the light-shielding box is preferably colored black, and more preferably has a matte finish.
  • the light-shielding box 2 is provided with an opening 2a on the plating layer 10a side.
  • the opening 2a is provided on the lower surface of the rectangular parallelepiped, cylinder, or polygon.
  • the opening 2a may be the entirety of the plating layer 10a side of the light-shielding box 2, or the opening 2a may be formed by providing a wall portion on the plating layer 10a side of the light-shielding box 2 and opening a part of the wall portion. A portion 2a may be provided.
  • the opening area of the observation window 2b is too large, the amount of environmental light that enters the surface of the plating layer 10a from the observation window 2b will increase, which is not preferable because it will interfere with the observation of the plating layer 10a. Therefore, the opening area of the observation window 2b should be adjusted to such an extent that it will not be affected by environmental light.
  • an imaging device (not shown) may be attached to the observation window 2b. Furthermore, when an imaging device is attached to the observation window 2b, it is preferable that the imaging device blocks out environmental light.
  • the annular light source 3 placed in the light shielding box 2 includes an annular support 3b having an observation hole 3a and a plurality of light sources 3c (for example, light emitting diodes 3c, hereinafter referred to as light emitting diodes 3c).
  • the annular support 3b has an observation hole 3a which is a through hole connecting the observation window 2b and the opening 2a, and the annular support 3b has an inner circumferential surface 3d surrounded by the inner circumferential surface 3d. The area becomes the observation hole 3a.
  • the light emitting diode 3c is arranged on this inner peripheral surface 3d.
  • the light emitting diodes 3c are arranged, for example, in a line along the circumferential direction of the inner peripheral surface 3d.
  • the annular light source 3 is located inside the light shielding box 2 and between the opening 2a and the observation window 2b. Further, it is preferable that the observation window 2b is arranged on a center line passing through the center of the observation hole 3a of the annular light source 3. More preferably, the annular light source 3 is arranged such that the center of the observation hole 3a coincides with the center of the observation window 2b. As a result, the field of view of the observation window 2b overlaps with the observation hole 3a, and an observer or an imaging device (not shown) can see the surface of the plating layer 10a exposed in the opening 2a through the observation window 2b and the observation hole 3a. It becomes possible to observe from the normal direction.
  • the power source for the annular light source 3 may be a fixed power source installed indoors or outdoors, or a portable power source such as a battery. It is preferable that the illuminance of the illumination light from the annular light source 3 can be changed depending on the state of the surface of the plating layer 10a to be observed. A portion of the illumination light emitted from the light emitting diode 3c is irradiated onto a region of the surface of the plating layer 10a located below the annular light source 3, located directly below the observation window 2b. This area is called an observation area K. The annular light source 3 irradiates the observation area K with illumination light having an incident angle in the range of 35° to 80° with respect to the normal direction of the surface of the plating layer 10a. Then, reflected light reflected from the observation area K in the normal direction of the plating layer 10a is extracted from the observation window 2b.
  • FIG. 5 is a diagram showing an example of the inspection device 100 according to this embodiment.
  • the inspection device 100 includes a conveyance device 101 that conveys a hot-dipped steel plate, an observation device 1, a display device 102, and a support 103.
  • the observation device 1 is supported by a support column 103 and is placed above the hot-dip plated steel plate 10 to be inspected. At this time, it is preferable that the observation direction with respect to the surface of the hot-dip plated steel sheet 10 can be changed freely.
  • the inspection device 100 may also be referred to as an observation device. That is, the observation device 1 may include any one of the transport device 101, the display device 102, and the support 103.
  • the annular light source 3 is turned on.
  • the annular light source 3 irradiates illumination light toward an observation area K on the surface of the plating layer 10a.
  • the illumination light is mainly irradiated onto the observation area K located directly under the opening 2a of the annular light source 3 on the surface of the plating layer 10a located below the annular light source 3.
  • the observation area K on the surface of the plating layer 10a is irradiated with illumination light having an incident angle in the range of 35° to 80° with respect to the normal direction to the surface of the plating layer 10a. Furthermore, the incidence of environmental light at other angles of incidence is restricted into the observation area K on the surface of the plating layer 10a.
  • the plating layer 10a having the patterned portion and the non-patterned portion of the first example When the plating layer 10a having the patterned portion and the non-patterned portion of the first example is observed, a satin-like appearance is observed as a whole, and a difference in metallic luster between the patterned portion and the non-patterned portion and a difference in the metallic luster are observed.
  • a pattern portion having a predetermined shape can be visually recognized due to the difference in color tone, especially the difference in brightness. This is also the case when observing the plating layer 10a having patterned portions and non-patterned portions in the second example.
  • the plating layer 10a is observed when the ambient light is sufficiently bright, that is, when the amount of light is sufficient and the ambient light is from an unspecified direction. There are cases where Hereinafter, this will be referred to as the first comparison environment.
  • the pattern portions are not visible and are observed as a uniform satin pattern, as in the above case.
  • the satin-finished pattern may have partial brightness shading.
  • the light-shielding box 2 restricts the incidence of environmental light from an unspecified direction onto the plating layer 10a to be observed.
  • the annular light source 3 provided inside the light-shielding box 2 illuminates the observation area K of the surface of the plating layer 10a located directly under the opening 2a of the annular light source 3 at an irradiation angle of 35° to 80°. By irradiating with light, it becomes possible to observe the surface of the plating layer 10a of the hot-dip plated steel sheet 10 under certain conditions that are not affected by environmental light.
  • the present invention can be suitably applied to a plating layer 10a in which the visibility of patterns such as letters and designs changes depending on the angle of incidence of light rays on the plating layer 10a.
  • the annular support 3b having the observation hole 3a and the inner circumferential surface 3d of the annular support 3b are provided along the circumferential direction of the inner circumferential surface 3d.
  • An annular light source 3 including a plurality of light emitting diodes 3c arranged in a row is provided. Further, it is preferable that the plurality of light emitting diodes be arranged symmetrically or at equal intervals with respect to the observation area K. With such a configuration, the observation area K on the surface of the plating layer 10a located below the observation hole 3a can be irradiated with even illumination light.
  • the hot-dip plated steel plate observation apparatus 1 of this embodiment since an imaging device can be attached to the observation window 2b, it is possible to photograph the surface of the plating layer 10a.
  • the observation window 2b is arranged on the center line passing through the center of the observation hole 3a, reflected light directed in the normal direction of the surface of the plating layer 10a can be taken out from the observation window 2b, making it easier to observe patterns such as letters and designs on the surface of the plating layer 10a, and making it possible to more stably observe the satin pattern of the plating layer 10a.
  • Test example 1 After degreasing and washing the steel plate with water, reduction annealing, immersion in a plating bath, coating amount control, and cooling were performed to form No. 1 steel plate having a plating layer having the chemical composition shown in Table 1. Hot-dip galvanized steel sheets A1 to A10 were manufactured.
  • the obtained hot-dip plated steel sheet was taken outdoors during the day, and the surface of the plating layer was observed using the observation apparatus shown in FIGS. 2 and 3. Furthermore, as a comparative example, the surface of the plating layer was observed without using an observation device. As a result, as shown in Table 2, in the case of the invention example using the observation device, the incident light was incident on the plating layer in the range of 35° to 80°, so the satin pattern of the plating layer could be stably maintained. I was able to observe it. On the other hand, in addition to the light from the range of 35° to 80°, light from directions other than 35° to 80° was incident, resulting in a satin pattern on the plating layer. There were times when it was difficult to see.
  • Test example 2 After degreasing the steel plate and washing it with water, ink containing carbon is applied to a rubber plate with a 50 mm interval transfer grid pattern transferred thereto, and this rubber plate is pressed against the steel plate to cause the ink to adhere to the steel plate. Ta. Thereafter, by performing reduction annealing, immersion in a plating bath, controlling the coating amount, and cooling, No. Hot-dip galvanized steel sheets B1 to B8 were manufactured. As a result, the pattern portion is formed at a preset position.
  • the surface roughness Ra is determined by imaging the surface of the plating layer with an atomic force microscope (AFM) for each region of the patterned part and the non-patterned part at preset positions, and Five visual fields were prepared, the roughness curves were measured in each visual field, and the average value of the arithmetic mean roughness (Ra) of the five visual fields was determined. The average value of this arithmetic mean roughness (Ra) was defined as the surface roughness Ra.
  • AFM atomic force microscope
  • [Method for evaluating exposure ratio of Al phase] Prepare five 100x scanning electron micrographs of multiple locations on the surface of the plating layer for each of the patterned and non-patterned areas at preset positions, and use the obtained images to obtain a field of view of 800 ⁇ m. Five photographs were prepared, and the area of the Al phase exposed on the surface of the hot-dip plating layer was measured using commercially available image analysis software, and the average value of the exposed area of the Al phase in the five photographs was determined. Then, the average exposed area ratio (%) of the Al phase in the observation field was determined by dividing the average value of the exposed area of the Al phase by the total area of the observation field. The average exposed area ratio (%) of this Al phase was defined as the exposed ratio of the Al phase.
  • the obtained hot-dip plated steel sheet was taken outdoors during the day, and the pattern portion formed on the surface of the plating layer was observed using the observation apparatus shown in FIGS. 2 and 3. Moreover, as a comparative example, the pattern portion on the surface of the plating layer was observed without using an observation device. As a result, as shown in Table 3, in the example using the observation device, the incident light was incident on the plating layer at an angle of 35° to 80°, making it difficult to clearly observe the patterned portion of the plating layer. was completed. On the other hand, in the comparative example, in addition to light from a range of 35° to 80°, light from directions other than 35° to 80° was incident, making it difficult to see the patterned portion of the plating layer.
  • the obtained hot-dip plated steel sheet was taken outdoors during the day, and the pattern portion formed on the surface of the plating layer was observed using the observation apparatus shown in FIGS. 2 and 3. Moreover, as a comparative example, the pattern portion on the surface of the plating layer was observed without using an observation device. As a result, as shown in Table 5, in the case of the invention example using the observation device, the incident light was incident on the plating layer in the range of 35° to 80° in all of C1 to C8, so the plating The pattern of the layer could be clearly observed. On the other hand, in addition to the light from the range of 35° to 80°, light from directions other than 35° to 80° was incident on all of C1 to C8. , it was difficult to visually recognize the pattern part of the plating layer.

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Abstract

The present invention employs a device (1) for observing a hot-dipped steel sheet, the device (1) being used for observing the surface of a plating layer (10a) on a hot-dipped steel sheet (10) that is provided with the plating layer (10a), the device (1) for observing a hot-dipped steel sheet comprising a light-shielding box (2) that can be disposed contacting the plating layer (10a) and that shields the surface of the plating layer (10a) from incident environmental light, and an annular light source (3) that is installed inside the light-shielding box (2) and has an observation hole (3a), the light-shielding box (2) being provided with an opening section (2a) for exposing the surface of the plating layer (10a) to the interior of the light-shielding box (2) and an observation window (2b) disposed opposite the opening section (2a), and the annular light source (3) being disposed between the opening section (2a) and the observation window (2b) and irradiating an observation region (K) on the surface of the plating layer (10a) with light having an irradiation angle within the range of 35-80°.

Description

溶融めっき鋼板の観察装置および溶融めっき鋼板の観察方法Hot-dip galvanized steel sheet observation device and hot-dip galvanized steel sheet observation method
　本発明は、溶融めっき鋼板の観察装置および溶融めっき鋼板の観察方法に関する。
　本願は、２０２２年６月１０日に、日本に出願された特願２０２２－０９４３５２号に基づき優先権を主張し、その内容をここに援用する。 The present invention relates to a hot-dip-coated steel plate observation device and a hot-dip-coated steel plate observation method.
This application claims priority based on Japanese Patent Application No. 2022-094352 filed in Japan on June 10, 2022, the contents of which are incorporated herein.
　溶融亜鉛めっき鋼板に比べて高い耐食性を有するＺｎ－Ａｌ－Ｍｇ系溶融めっき鋼板は、建材、家電、自動車分野等種々の製造業において広く使用されており、近年、その使用量が増加している。 Zn-Al-Mg hot-dip galvanized steel sheets, which have higher corrosion resistance than hot-dip galvanized steel sheets, are widely used in various manufacturing industries such as building materials, home appliances, and automobiles, and their usage has been increasing in recent years. .
　ところで、溶融めっき鋼板の溶融めっき層の表面に、文字、模様、デザイン画などを現すことを目的として、溶融めっき層に印刷や塗装などの工程を施すことにより、文字、模様、デザイン画などを溶融めっき層の表面に現す場合がある。 By the way, for the purpose of making letters, patterns, designs, etc. appear on the surface of the hot-dip coating layer of a hot-dip-coated steel plate, by applying processes such as printing and painting to the hot-dip coating layer, letters, patterns, designs, etc. can be printed on the surface of the hot-dip coating layer. It may appear on the surface of the hot-dip plating layer.
　しかし、溶融めっき層に印刷や塗装などの工程を行うと、文字やデザイン等を施すためのコストや時間が増大する問題がある。更に、印刷や塗装によって文字やデザイン等をめっき層の表面に現す場合は、需要者から高い支持を得ている金属光沢外観が失われるだけでなく、塗膜自体の経時劣化や塗膜の密着性の経時劣化の問題から、耐久性が劣り、時間とともに文字やデザイン等が消失してしまう恐れがある。また、インクをスタンプすることで文字やデザイン等をめっき層の表面に現す場合は、コストや時間は比較的抑えられるものの、インクによって溶融めっき層の耐食性が低下する懸念がある。更に、溶融めっき層の研削によって意匠等を現す場合は、意匠等の耐久性は優れるものの、研削箇所の溶融めっき層の厚みが大幅に減少することから耐食性低下が必然であり、めっき特性の低下が懸念される。 However, when processes such as printing and painting are performed on the hot-dip plating layer, there is a problem in that the cost and time for applying letters, designs, etc. increase. Furthermore, when characters or designs are displayed on the surface of the plating layer by printing or painting, not only does the metallic luster appearance that is highly popular among customers be lost, but also the paint film itself deteriorates over time and the adhesion of the paint film deteriorates. Due to the problem of physical deterioration over time, durability is poor, and there is a risk that letters, designs, etc. may disappear over time. In addition, when stamping ink to display characters, designs, etc. on the surface of the plating layer, although cost and time are relatively reduced, there is a concern that the ink may reduce the corrosion resistance of the hot-dip plating layer. Furthermore, when a design is created by grinding a hot-dip plating layer, although the durability of the design is excellent, the thickness of the hot-dip plating layer at the grinding point is significantly reduced, which inevitably leads to a decrease in corrosion resistance and a decrease in plating properties. There are concerns.
　そこで、下記特許文献１に示されるように、Ｚｎ－Ａｌ－Ｍｇ系溶融めっき鋼板のめっき層表面に文字やデザイン等を現す技術が提案されている。 Therefore, as shown in Patent Document 1 below, a technique has been proposed for displaying letters, designs, etc. on the surface of the plating layer of a Zn-Al-Mg hot-dip plated steel sheet.
特許第６６４８８７１号公報Patent No. 6648871
　特許文献１に記載されたＺｎ－Ａｌ－Ｍｇ系溶融めっき鋼板は、インク塗布や研削加工によらずに、めっき層の表面に、直線部、曲線部、図形、数字、記号及び文字またはこれらを組合せてなる意図的なパターンを視認できるようにしたものであるが、めっき層表面に入射する光線の具合、すなわち、環境光の入射角度によっては、意図的なパターンを視認しにくくなる場合がある。 The Zn-Al-Mg hot-dip plated steel sheet described in Patent Document 1 has linear parts, curved parts, figures, numbers, symbols, characters, or these on the surface of the plating layer without ink application or grinding. This allows the intentional pattern formed by the combination to be visible, but depending on the condition of the light rays that enter the surface of the plating layer, that is, the angle of incidence of the environmental light, it may become difficult to see the intentional pattern. .
　また、一般に、Ｚｎ－Ａｌ－Ｍｇ系溶融めっき鋼板は、めっき層表面が梨地模様を呈しており、梨地模様自体に商品価値が認められている。そのため、Ｚｎ－Ａｌ－Ｍｇ系溶融めっき鋼板においては、めっき層の外観が品質評価対象になっている。しかし、めっき層の梨地模様は、環境光の入射角度によって、視認した際の印象が変化する場合がある。そこで、パターンが形成されないめっき鋼板であっても、一定の条件下で、めっき層の梨地模様を確認する手段および手法が求められている。 Additionally, in general, Zn-Al-Mg hot-dip plated steel sheets have a satin pattern on the surface of the plating layer, and the satin pattern itself is recognized as having commercial value. Therefore, in Zn-Al-Mg hot-dipped steel sheets, the appearance of the plating layer is the subject of quality evaluation. However, the impression of the satin pattern of the plating layer when viewed may change depending on the incident angle of environmental light. Therefore, there is a need for a means and method for confirming the satin pattern of a plating layer under certain conditions even in a plated steel sheet in which no pattern is formed.
　本発明は、上記事情に鑑みてなされたものであり、Ｚｎ－Ａｌ－Ｍｇ系溶融めっき鋼板のめっき層の表面を、一定の条件下で観察することを可能とする、溶融めっき鋼板の観察装置および溶融めっき鋼板の観察方法を提供することを課題とする。 The present invention has been made in view of the above-mentioned circumstances, and provides a hot-dip galvanized steel plate observation device that enables observation of the surface of a plating layer of a Zn-Al-Mg hot-dip galvanized steel plate under certain conditions. The object of the present invention is to provide a method for observing hot-dipped steel sheets.
　上記課題を解決するため、本発明は以下の構成を採用する。
［１］　平均組成で、Ａｌ：０～９０質量％、Ｍｇ：０～１０質量％を含有し、残部がＺｎおよび不純物を含むめっき層を備えた溶融めっき鋼板の前記めっき層の表面を観察する観察装置であり、
　前記めっき層上に接して配置可能であって前記めっき層表面への環境光の入射を遮光する遮光箱と、
　前記遮光箱の内部に設置された、観察孔を有する環状光源と、が備えられ、
　前記遮光箱は、前記めっき層表面を前記遮光箱の内部に露出させるための開口部と、前記開口部に対向配置する観察窓と、を備え、
　前記環状光源は、前記開口部と前記観察窓との間に配置されるとともに、前記めっき層表面の観察領域に向けて照射角度３５°～８０°の範囲の光を照射する、溶融めっき鋼板の観察装置。
［２］　前記環状光源は、前記観察孔を有する環状支持体と、前記環状支持体の内周面にあって、前記内周面の周方向に沿って配置された複数の光源と、から構成される、［１］に記載の溶融めっき鋼板の観察装置。
［３］　前記観察窓に、撮像装置が装着可能とされている、［１］に記載の溶融めっき鋼板の観察装置。
［４］　前記観察窓に、撮像装置が装着された、［１］に記載の溶融めっき鋼板の観察装置。
［５］　前記観察孔の中心を通る中心線上に前記観察窓が配置されている、［１］に記載の溶融めっき鋼板の観察装置。
［６］　前記観察窓以外から入射する環境光のうち、前記めっき層表面の観察領域に向けて少なくとも照射角度３５°～８０°以外からの環境光を遮断する、［１］に記載の溶融めっき鋼板の観察装置。
［７］　平均組成で、Ａｌ：０～９０質量％、Ｍｇ：０～１０質量％を含有し、残部がＺｎおよび不純物を含むめっき層を備えた溶融めっき鋼板の前記めっき層の表面を観察する観察装置であり、
　前記めっき層上に配置可能であって前記めっき層表面への環境光の入射を遮光する遮光箱と、
　前記遮光箱の内部に設置された、観察孔を有する環状光源と、が備えられ、
　前記遮光箱は、前記めっき層表面を前記遮光箱の内部に露出させるための開口部と、前記開口部に対向配置する観察窓と、を備え、
　前記環状光源は、前記開口部と前記観察窓との間に配置されるとともに、前記開口部の直下に位置する前記めっき層表面の観察領域に向けて照射角度３５°～８０°の範囲の照明光を照射し、
　前記環状光源は、前記観察孔を有する環状支持体と、前記環状支持体の内周面にあって、前記内周面の周方向に沿って配置された複数の光源と、から構成され、
　前記観察孔の中心を通る中心線上に前記観察窓が配置されている、溶融めっき鋼板の観察装置。
［８］　鋼板と、前記鋼板の表面に形成された溶融めっき層と、を備え、
　前記溶融めっき層は、平均組成で、Ａｌ：４～２２質量％、Ｍｇ：１．０～１０質量％を含有し、残部がＺｎおよび不純物を含み、
　前記溶融めっき層の表面外観は梨地状であり、
　前記溶融めっき層表面の観察領域に対する入射角が０°～３５°未満、８０°超～９０°以下のいずれかの範囲内の環境光を遮光しながら、前記溶融めっき層表面の観察領域に向けて照射角度３５°～８０°の範囲の照明光を照射することと、
　前記溶融めっき層表面の法線方向における、前記照明光に対する前記観察領域から反射光を観察すること
　を備える溶融めっき鋼板の観察方法。
［９］　鋼板と、前記鋼板の表面に形成された溶融めっき層と、を備え、
　前記溶融めっき層は、平均組成で、Ａｌ：４～２２質量％、Ｍｇ：１．０～１０質量％を含有し、残部がＺｎおよび不純物を含み、
　前記溶融めっき層に配置されたパターン部と、非パターン部とを備え、
　前記パターン部におけるＡｌ相の露出割合が３０面積％未満であり、前記非パターン部におけるＡｌ相の露出割合が３０面積％以上である溶融めっき鋼板を提供することと、
　前記溶融めっき層表面の観察領域に対する入射角が０°～３５°未満、８０°超～９０°以下のいずれかの範囲内の環境光を遮光しながら、前記溶融めっき層表面の観察領域に向けて照射角度３５°～８０°の範囲の照明光を照射することと、
　前記溶融めっき層表面の法線方向における、前記照明光に対する前記観察領域から反射光を観察すること
　を備える［８］に記載の溶融めっき鋼板の観察方法。
［１０］　鋼板と、前記鋼板の表面に形成された溶融めっき層と、を備え、
　前記溶融めっき層は、平均組成で、Ａｌ：４～２２質量％、Ｍｇ：１．０～１０質量％を含有し、残部がＺｎおよび不純物を含み、
　前記溶融めっき層に配置されたパターン部と、非パターン部とを備え、
　前記パターン部における算術平均面粗さＳａが１μｍ未満であり、前記非パターン部における算術平均面粗さＳａが１μｍ以上である溶融めっき鋼板を提供することと、
　前記溶融めっき層表面の観察領域に対する入射角が０°～３５°未満、８０°超～９０°以下のいずれかの範囲内の環境光を遮光しながら、前記溶融めっき層表面の観察領域に向けて照射角度３５°～８０°の範囲の照明光を照射することと、
　前記溶融めっき層表面の法線方向における、前記照明光に対する前記観察領域から反射光を観察すること
　を備える［８］に記載の溶融めっき鋼板の観察方法。
［１１］　鋼板と、前記鋼板の表面に形成された溶融めっき層と、を備え、
　前記溶融めっき層は、平均組成で、Ａｌ：４～２２質量％、Ｍｇ：１．０～１０質量％を含有し、残部がＺｎおよび不純物を含み、
　前記溶融めっき層に、パターン部と、非パターン部とを備え、
　前記鋼板表面の法線方向に対して入射角度０°～９０°未満の範囲の入射光に対する、前記法線方向への前記パターン部の反射光および前記法線方向への前記非パターン部の反射光の関係が、下記式（１）および式（２）を満足する、溶融めっき鋼板を提供することと、
　前記溶融めっき層表面の観察領域に対する入射角が０°～３５°未満、８０°超～９０°以下のいずれかの範囲内の環境光を遮光しながら、前記溶融めっき層表面の観察領域に向けて照射角度３５°～８０°の範囲の照明光を照射することと、
　前記溶融めっき層表面の法線方向における、前記照明光に対する前記観察領域から反射光を観察すること
　を備える［８］に記載の溶融めっき鋼板の観察方法。
｜ＩＰＨ－ＩＢＨ｜／｜ＩＰＭ－ＩＢＭ｜＜１．０　…（１）
｜ＩＰＬ－ＩＢＬ｜／｜ＩＰＭ－ＩＢＭ｜＜１．０　…（２）
　但し、
ＩＰＨ：入射角度０°～３５°未満の入射光に対する法線方向のパターン部の反射強度
ＩＢＨ：入射角度０°～３５°未満の入射光に対する法線方向の非パターン部の反射強度
ＩＰＭ：入射角度３５°～８０°の入射光に対する法線方向のパターン部の反射強度
ＩＢＭ：入射角度３５°～８０°の入射光に対する法線方向の非パターン部の反射強度
ＩＰＬ：入射角度８０°超～９０°未満の入射光に対する法線方向のパターン部の反射強度
ＩＢＬ：入射角度８０°超～９０°未満の入射光に対する法線方向の非パターン部の反射強度。
［１２］　溶融めっき鋼板のめっき層表面に、［１］乃至［７］の何れか一項に記載の溶融めっき鋼板の観察装置を設置し、前記観察装置に備えられた環状光源を点灯し、前記観察装置に設けられた観察窓から前記めっき層表面を観察する、溶融めっき鋼板の観察方法。
［１３］　［１］から［７］のいずれか一項に記載の観察装置と、
　前記溶融めっき鋼板を搬送する搬送装置と、
　前記観察窓に取り付けられ、前記開口部を介して前記溶融めっき鋼板の表面を撮像する撮像装置と、を具備する、検査装置。
［１４］　前記観察装置は、前記遮光箱と前記溶融めっき鋼板との間に設けられる遮光シールを有し、
　前記遮光シールは、生地又はブラシからなる、［１３］に記載の検査装置。 In order to solve the above problems, the present invention employs the following configuration.
[1] Observe the surface of the plating layer of a hot-dip plated steel sheet having a plating layer containing, in average composition, Al: 0 to 90% by mass, Mg: 0 to 10% by mass, and the remainder containing Zn and impurities. It is an observation device,
a light-shielding box that can be placed in contact with the plating layer and blocks environmental light from entering the surface of the plating layer;
an annular light source having an observation hole installed inside the light-shielding box;
The light-shielding box includes an opening for exposing the surface of the plating layer inside the light-shielding box, and an observation window disposed opposite to the opening,
The annular light source is arranged between the opening and the observation window, and irradiates light at an irradiation angle of 35° to 80° toward an observation area on the surface of the plating layer. Observation device.
[2] The annular light source includes an annular support having the observation hole, and a plurality of light sources disposed on an inner circumferential surface of the annular support and along a circumferential direction of the inner circumferential surface. The hot-dip galvanized steel plate observation device according to [1].
[3] The hot-dip plated steel plate observation device according to [1], wherein an imaging device can be attached to the observation window.
[4] The hot-dip plated steel plate observation device according to [1], wherein the observation window is equipped with an imaging device.
[5] The observation device for a hot-dipped steel plate according to [1], wherein the observation window is arranged on a center line passing through the center of the observation hole.
[6] The hot-dip plating according to [1], which blocks at least ambient light from irradiation angles other than 35° to 80° toward the observation area on the surface of the plating layer among the environmental light incident from other than the observation window. Observation device for steel plates.
[7] Observe the surface of the plating layer of a hot-dip plated steel sheet having a plating layer containing, in average composition, Al: 0 to 90% by mass, Mg: 0 to 10% by mass, and the balance containing Zn and impurities. It is an observation device,
a light-shielding box that can be placed on the plating layer and blocks environmental light from entering the surface of the plating layer;
an annular light source having an observation hole installed inside the light-shielding box;
The light-shielding box includes an opening for exposing the surface of the plating layer inside the light-shielding box, and an observation window disposed opposite to the opening,
The annular light source is disposed between the opening and the observation window, and emits illumination at an irradiation angle of 35° to 80° toward an observation area on the surface of the plating layer located directly below the opening. irradiate light,
The annular light source includes an annular support having the observation hole, and a plurality of light sources disposed on the inner peripheral surface of the annular support along the circumferential direction of the inner peripheral surface,
An observation device for a hot-dipped steel plate, wherein the observation window is arranged on a center line passing through the center of the observation hole.
[8] Comprising a steel plate and a hot-dip plating layer formed on the surface of the steel plate,
The hot-dip plating layer has an average composition of Al: 4 to 22% by mass, Mg: 1.0 to 10% by mass, and the remainder contains Zn and impurities,
The surface appearance of the hot-dip plating layer is satin-like,
Aim at the observation area on the surface of the hot-dip plating layer while blocking environmental light whose incident angle to the observation area on the surface of the hot-dip plating layer is within a range of 0° to less than 35°, more than 80° to 90° or less. irradiating illumination light with an irradiation angle in the range of 35° to 80°;
A method for observing a hot-dip plated steel sheet, comprising: observing reflected light from the observation area with respect to the illumination light in the normal direction of the surface of the hot-dip plated layer.
[9] Comprising a steel plate and a hot-dip plating layer formed on the surface of the steel plate,
The hot-dip plating layer has an average composition of Al: 4 to 22% by mass, Mg: 1.0 to 10% by mass, and the remainder contains Zn and impurities,
comprising a pattern part and a non-pattern part arranged on the hot-dip plating layer,
Provided is a hot-dip plated steel sheet, in which the exposed proportion of the Al phase in the patterned portion is less than 30 area %, and the exposed proportion of the Al phase in the non-patterned portion is 30 area % or more;
Aim at the observation area on the surface of the hot-dip plating layer while blocking environmental light whose incident angle to the observation area on the surface of the hot-dip plating layer is within a range of 0° to less than 35°, more than 80° to 90° or less. irradiating illumination light with an irradiation angle in the range of 35° to 80°;
The method for observing a hot-dip plated steel sheet according to [8], comprising observing reflected light from the observation area with respect to the illumination light in the normal direction of the surface of the hot-dip plated layer.
[10] Comprising a steel plate and a hot-dip plating layer formed on the surface of the steel plate,
The hot-dip plating layer has an average composition of Al: 4 to 22% by mass, Mg: 1.0 to 10% by mass, and the remainder contains Zn and impurities,
comprising a pattern part and a non-pattern part arranged on the hot-dip plating layer,
Provided is a hot-dip plated steel sheet, wherein the patterned portion has an arithmetic mean surface roughness Sa of less than 1 μm, and the non-patterned portion has an arithmetic mean surface roughness Sa of 1 μm or more;
Aim at the observation area on the surface of the hot-dip plating layer while blocking environmental light whose incident angle to the observation area on the surface of the hot-dip plating layer is within a range of 0° to less than 35°, more than 80° to 90° or less. irradiating illumination light with an irradiation angle in the range of 35° to 80°;
The method for observing a hot-dip plated steel sheet according to [8], comprising observing reflected light from the observation area with respect to the illumination light in the normal direction of the surface of the hot-dip plated layer.
[11] Comprising a steel plate and a hot-dip plating layer formed on the surface of the steel plate,
The hot-dip plating layer has an average composition of Al: 4 to 22% by mass, Mg: 1.0 to 10% by mass, and the remainder contains Zn and impurities,
The hot-dip plating layer includes a pattern part and a non-pattern part,
Reflection of light from the pattern portion in the normal direction and reflection from the non-pattern portion in the normal direction with respect to incident light having an incident angle in the range of 0° to less than 90° with respect to the normal direction of the steel plate surface. To provide a hot-dipped steel plate whose light relationship satisfies the following formulas (1) and (2);
Aim at the observation area on the surface of the hot-dip plating layer while blocking environmental light whose incident angle to the observation area on the surface of the hot-dip plating layer is within a range of 0° to less than 35°, more than 80° to 90° or less. irradiating illumination light with an irradiation angle in the range of 35° to 80°;
The method for observing a hot-dip plated steel sheet according to [8], comprising observing reflected light from the observation area with respect to the illumination light in the normal direction of the surface of the hot-dip plated layer.
|IPH-IBH|/|IPM-IBM|<1.0...(1)
|IPL-IBL|/|IPM-IBM|<1.0...(2)
however,
IPH: Reflection intensity of a pattern part in the normal direction for incident light with an incident angle of 0° to less than 35° IBH: Reflection intensity of a non-pattern part in the normal direction to incident light with an incident angle of 0° to less than 35° IPM: Incident Reflection intensity of the pattern part in the normal direction for incident light at an angle of 35° to 80°IBM: Reflection intensity of the non-pattern part in the normal direction to incident light at an incident angle of 35° to 80°IPL: Incident angle of more than 80° Reflection intensity of the pattern portion in the normal direction for incident light at an angle of less than 90° IBL: Reflection intensity of the non-pattern portion in the normal direction for incident light at an incident angle of more than 80° to less than 90°.
[12] Installing the hot-dip-coated steel sheet observation device according to any one of [1] to [7] on the surface of the plating layer of the hot-dip-coated steel sheet, and lighting up an annular light source provided in the observation device, A method for observing a hot-dip plated steel sheet, comprising observing the surface of the plating layer through an observation window provided in the observation device.
[13] The observation device according to any one of [1] to [7],
a conveyance device that conveys the hot-dipped steel plate;
An inspection device comprising: an imaging device attached to the observation window and capturing an image of the surface of the hot-dip plated steel plate through the opening.
[14] The observation device includes a light-shielding seal provided between the light-shielding box and the hot-dip plated steel plate,
The inspection device according to [13], wherein the light-shielding seal is made of fabric or a brush.
　本発明の溶融めっき鋼板の観察装置および溶融めっき鋼板の観察方法によれば、溶融めっき鋼板のめっき層の表面を、例えば屋外等の環境光の条件が不安定な環境においても、環境光の影響を受けずに観察することを可能になる。これにより、めっき層の表面に表された文字やデザイン等のパターンが観察しやすくなり、また、めっき層の梨地模様を安定して観察することができる。特に、めっき層への光線の入射角度によって、文字やデザイン等のパターンの視認性が変化するようなめっき層に対して、本発明を好適に適用できる。 According to the hot-dip galvanized steel sheet observation apparatus and the hot-dip galvanized steel sheet observation method of the present invention, the surface of the plating layer of the hot-dip galvanized steel sheet can be inspected even in environments where the environmental light conditions are unstable, such as outdoors. This makes it possible to observe the image without being affected by it. This makes it easier to observe patterns such as letters and designs on the surface of the plating layer, and also allows stable observation of the satin pattern of the plating layer. In particular, the present invention can be suitably applied to a plating layer in which the visibility of patterns such as letters and designs changes depending on the angle of incidence of light rays on the plating layer.
図１は、照明光の入射角度とパターン部の視認性との関係を説明する模式図。FIG. 1 is a schematic diagram illustrating the relationship between the incident angle of illumination light and the visibility of a pattern portion. 図２は、本発明の一実施形態である観察装置を示す断面模式図。FIG. 2 is a schematic cross-sectional view showing an observation device that is an embodiment of the present invention. 図３は、本発明の一実施形態である観察装置を示す平面模式図。FIG. 3 is a schematic plan view showing an observation device that is an embodiment of the present invention. 図４は、環状光源から観察領域に向けて照射される照明光を説明する模式図。FIG. 4 is a schematic diagram illustrating illumination light emitted from an annular light source toward an observation area. 図５は、本発明の一実施形態である検査装置を示す模式図。FIG. 5 is a schematic diagram showing an inspection device according to an embodiment of the present invention.
　Ｚｎ－Ａｌ－Ｍｇ系溶融めっき鋼板のめっき層において、例えば、表面粗さや、Ａｌ相の露出割合を調整することによって、めっき層の表面に、直線部、曲線部、図形、数字、記号及び文字またはこれらを組合せてなる意図的なパターン部を形成できるようになっている。めっき層に形成された意図的なパターン部は、めっき層表面で反射した反射光が人の網膜に入射することによって、視覚として視認される。このため、めっき層表面のパターン部の視認性は、めっき層表面への入射光の入射角度によって変化する場合がある。すなわち、不特定の方向から入射する環境光の下では、めっき層に形成したパターン部が視認しにくくなる場合がある。 In the plating layer of a Zn-Al-Mg hot-dip galvanized steel sheet, for example, by adjusting the surface roughness and the exposure ratio of the Al phase, the surface of the plating layer can be formed with straight parts, curved parts, figures, numbers, symbols, and characters. Alternatively, an intentional pattern portion can be formed by combining these. The intentional pattern portion formed on the plating layer is visually recognized when the reflected light reflected from the surface of the plating layer enters the human retina. Therefore, the visibility of the pattern portion on the surface of the plating layer may change depending on the angle of incidence of light incident on the surface of the plating layer. That is, under environmental light incident from an unspecified direction, the pattern portion formed on the plating layer may become difficult to see.
　また、Ｚｎ－Ａｌ－Ｍｇ系溶融めっき鋼板は、めっき層表面の梨地模様に商品価値が認められていることから、めっき層の外観が品質評価対象になっている。しかし、不特定な方向から入射する環境光の下では、鋼板を見る角度によって、めっき層の梨地模様を視認した際の印象が変化することがある。 In addition, since Zn-Al-Mg hot-dip coated steel sheets are recognized for their commercial value in the satin pattern on the surface of the plating layer, the appearance of the plating layer is the subject of quality evaluation. However, under ambient light incident from an unspecified direction, the impression of the satin pattern of the plating layer may change depending on the viewing angle of the steel plate.
　そこで、本発明者らが鋭意検討したところ、Ｚｎ－Ａｌ－Ｍｇ系溶融めっき鋼板のめっき層を、環境光の影響を受けない一定の条件下、すなわち照射角度３５°～８０°の範囲のみから照射された光源環境下で、観察する手段および手法を見出し、本発明を完成させるに至った。 Therefore, the inventors of the present invention conducted extensive research and found that the coating layer of Zn-Al-Mg hot-dipped steel sheet can be coated under certain conditions unaffected by environmental light, that is, only from an irradiation angle of 35° to 80°. We have discovered a means and method for observing under an irradiated light source environment, and have completed the present invention.
　以下、本発明の実施形態である溶融めっき鋼板の観察装置および溶融めっき鋼板の観察方法について説明する。以下の説明では、溶融めっき鋼板の観察装置を、「観察装置」と記載し、また、溶融めっき鋼板の観察方法を、「観察方法」と記載する場合がある。 Hereinafter, a hot-dip galvanized steel plate observation apparatus and a hot-dip galvanized steel plate observation method, which are embodiments of the present invention, will be described. In the following description, an observation device for a hot-dip-coated steel sheet may be referred to as an "observation device," and a method for observing a hot-dip-coated steel sheet may be referred to as an "observation method."
（溶融めっき鋼板）
　まず、本実施形態の観察対象である、溶融めっき鋼板について説明する。
　溶融めっき鋼板は、平均組成で、Ａｌ：０～９０質量％、Ｍｇ：０～１０質量％を含有し、残部がＺｎおよび不純物を含むめっき層を備えた所謂Ｚｎ－Ａｌ－Ｍｇ系溶融めっき鋼板である。 (Hot-dip galvanized steel sheet)
First, a hot-dip plated steel plate, which is an observation target of this embodiment, will be explained.
The hot-dip galvanized steel sheet is a so-called Zn-Al-Mg hot-dip galvanized steel sheet, which has a plating layer containing Al: 0 to 90% by mass, Mg: 0 to 10% by mass, and the remainder containing Zn and impurities. It is.
　めっき層は、好ましくは、平均組成で、Ａｌ：０超～９０質量％、Ｍｇ：０超～１０質量％を含有し、残部がＺｎおよび不純物からなるものであってもよく、更には、Ａｌ：４～２２質量％、Ｍｇ：１～１０質量％を含有し、残部がＺｎおよび不純物からなるものであってもよい。 The plating layer preferably contains, in average composition, Al: more than 0 to 90% by mass, Mg: more than 0 to 10% by mass, and the balance may be composed of Zn and impurities. : 4 to 22% by mass, Mg: 1 to 10% by mass, and the remainder may consist of Zn and impurities.
　また、めっき層には、平均組成で、更に、Ｓｉ：０．０００１～２質量％を含有してもよく、Ｎｉ、Ｔｉ、Ｚｒ、Ｓｒ、Ｆｅ、Ｓｂ、Ｐｂ、Ｓｎ、Ｃａ、Ｃｏ、Ｍｎ、Ｐ、Ｂ、Ｂｉ、Ｃｒ、Ｓｃ、Ｙ、ＲＥＭ、Ｈｆ、Ｃのいずれか１種または２種以上を、合計で０．０００１～２質量％含有してもよい。めっき層の付着量は、鋼板両面合計で３０～６００ｇ／ｍ２であってもよい。 In addition, the plating layer may further contain Si: 0.0001 to 2% by mass in the average composition, Ni, Ti, Zr, Sr, Fe, Sb, Pb, Sn, Ca, Co, Mn. , P, B, Bi, Cr, Sc, Y, REM, Hf, and C in a total amount of 0.0001 to 2% by mass. The total amount of the plating layer deposited on both sides of the steel plate may be 30 to 600 g/m 2 .
　めっき組成によって異なるが、このようなめっき層は、金属組織中に、〔Ａｌ相〕と、〔Ａｌ／Ｚｎ／ＭｇＺｎ２の三元共晶組織〕とが含まれる。具体的には、〔Ａｌ／Ｚｎ／ＭｇＺｎ２の三元共晶組織〕の素地中に、〔Ａｌ相〕が包含されている。また、〔Ａｌ／Ｚｎ／ＭｇＺｎ２の三元共晶組織〕の素地中に、〔ＭｇＺｎ２相〕や〔Ｚｎ相〕が含まれていてもよい。また、Ｓｉを含有させた場合には、〔Ａｌ／Ｚｎ／ＭｇＺｎ２の三元共晶組織〕の素地中に、〔Ｍｇ２Ｓｉ相〕が含まれていてもよい。 Although it varies depending on the plating composition, such a plating layer includes an [Al phase] and [ternary eutectic structure of Al/Zn/MgZn 2 ] in the metal structure. Specifically, [Al phase] is included in the matrix of [ternary eutectic structure of Al/Zn/MgZn 2] . Moreover, [MgZn 2 phase] or [Zn phase] may be included in the matrix of [ternary eutectic structure of Al/Zn/MgZn 2 ]. Moreover, when Si is contained, [Mg 2 Si phase] may be included in the matrix of [ternary eutectic structure of Al/Zn/MgZn 2 ].
　〔Ａｌ／Ｚｎ／ＭｇＺｎ２の三元共晶組織〕は、Ａｌ相と、Ｚｎ相と金属間化合物ＭｇＺｎ２相との三元共晶組織である。この三元共晶組織を形成しているＡｌ相は例えばＡｌ－Ｚｎ－Ｍｇの三元系平衡状態図における高温での「Ａｌ″相」（Ｚｎを固溶するＡｌ固溶体であり、少量のＭｇを含む）に相当し、常温では通常は微細なＡｌ相と微細なＺｎ相とに分離して現れる。また、該三元共晶組織中のＺｎ相は、少量のＡｌを固溶し、場合によってはさらに少量のＭｇを固溶したＺｎ固溶体である。更に、三元共晶組織中のＭｇＺｎ２相は、Ｚｎ－Ｍｇの二元系平衡状態図のＺｎ：約８４質量％の付近に存在する金属間化合物相である。 [Al/Zn/MgZn 2 ternary eutectic structure] is a ternary eutectic structure of an Al phase, a Zn phase, and an intermetallic compound MgZn 2 phase. The Al phase forming this ternary eutectic structure is, for example, the "Al" phase at high temperatures in the ternary equilibrium phase diagram of Al-Zn-Mg (an Al solid solution containing Zn, and a small amount of Mg ), and normally appears separated into a fine Al phase and a fine Zn phase at room temperature. Further, the Zn phase in the ternary eutectic structure is a Zn solid solution in which a small amount of Al is dissolved in solid solution, and in some cases, a further small amount of Mg is dissolved in solid solution. Further, the MgZn two phase in the ternary eutectic structure is an intermetallic compound phase that exists in the vicinity of about 84% by mass of Zn in the Zn-Mg binary system equilibrium phase diagram.
　〔Ａｌ相〕は、前記の三元共晶組織の素地中に明瞭な境界をもって島状に見える相であり、Ａｌ－Ｚｎ－Ｍｇの三元系平衡状態図における高温での「Ａｌ″相」（Ｚｎを固溶するＡｌ固溶体であり、少量のＭｇを含む）に相当し、常温では通常は微細なＡｌ相と微細なＺｎ相とに分離する。〔Ａｌ相〕は前記の三元共晶組織を形成しているＡｌ相とは顕微鏡観察において明瞭に区別できる。 [Al phase] is a phase that appears like an island with clear boundaries in the matrix of the above-mentioned ternary eutectic structure, and is the "Al" phase at high temperature in the ternary equilibrium phase diagram of Al-Zn-Mg. (It is an Al solid solution containing Zn as a solid solution and contains a small amount of Mg), and normally separates into a fine Al phase and a fine Zn phase at room temperature. [Al phase] can be clearly distinguished from the Al phase forming the above-mentioned ternary eutectic structure by microscopic observation.
　〔ＭｇＺｎ２相〕は、前記の三元共晶組織の素地中に明瞭な境界をもって島状に見える相であり、実際には少量のＡｌを固溶していることがある。状態図で見る限り、この相にはその他の添加元素を固溶していないか、固溶していても極微量であると考えられる。〔ＭｇＺｎ２相〕と前記の三元共晶組織を形成しているＭｇＺｎ２相とは、顕微鏡観察において明瞭に区別できる。 [MgZn 2 phase] is a phase that appears like an island with clear boundaries in the matrix of the above-mentioned ternary eutectic structure, and may actually contain a small amount of Al in solid solution. As far as we can see from the phase diagram, it is thought that this phase does not contain any other additive elements, or even if they do, the amount is extremely small. [MgZn two- phase] and the MgZn two- phase forming the above-mentioned ternary eutectic structure can be clearly distinguished by microscopic observation.
　〔Ｚｎ相〕は、前記の三元共晶組織の素地中に明瞭な境界をもって島状に見える相であり、実際には少量のＡｌや少量のＭｇを固溶していることがある。状態図で見る限り、この相にはその他の添加元素を固溶していないか、固溶していても極微量であると考えられる。〔Ｚｎ相〕は、前記の三元共晶組織を形成しているＺｎ相とは顕微鏡観察において明瞭に区別できる。 [Zn phase] is a phase that appears like an island with clear boundaries in the matrix of the above-mentioned ternary eutectic structure, and may actually contain a small amount of Al or a small amount of Mg in solid solution. As far as we can see from the phase diagram, it is thought that this phase does not contain any other additive elements, or even if they do, the amount is extremely small. [Zn phase] can be clearly distinguished from the Zn phase forming the above-mentioned ternary eutectic structure by microscopic observation.
　〔Ｍｇ２Ｓｉ相〕は、Ｓｉを添加しためっき層の凝固組織中に、明瞭な境界を持って島状に見える相である。状態図で見る限り、〔Ｍｇ２Ｓｉ相〕にはＺｎ、Ａｌ、その他の添加元素は固溶していないか、固溶していても極微量であると考えられる。〔Ｍｇ２Ｓｉ相〕は、溶融めっき層中では顕微鏡観察において明瞭に他の相と区別できる。 [Mg 2 Si phase] is a phase that appears like an island with clear boundaries in the solidified structure of the Si-added plating layer. As far as we can see from the phase diagram, it is thought that Zn, Al, and other additive elements are not solidly dissolved in the [Mg 2 Si phase], or even if they are solidly dissolved, the amount is extremely small. [Mg 2 Si phase] can be clearly distinguished from other phases in the hot-dip plating layer by microscopic observation.
　上記の化学成分を含有するめっき層は、溶融めっき法によって形成された場合に、上述の金属組織を有するものとなる。これにより、溶融めっき鋼板のめっき層は、梨地状の外観を呈するものとなる。 When the plating layer containing the above chemical components is formed by hot-dip plating, it has the above-mentioned metal structure. As a result, the plating layer of the hot-dip plated steel sheet exhibits a satin-like appearance.
　また、めっき層には、パターン部と、非パターン部とが形成されていてもよい。パターン部と非パターン部は、所定の形状となるように配置されていてもよい。パターン部は、直線部、曲線部、ドット部、図形、数字、記号、若しくは文字のいずれか１種またはこれらのうちの２種以上を組合せた形状となるように配置されていてもよい。更に、パターン部が、意図的な形状に配置されてもよい。パターン部における直線部や曲線部は、目視で認識できる程度の幅を有し、かつそれぞれ１ｍｍ以上の長さであることが好ましい。パターン部におけるドット部は円相当直径１ｍｍ以上１０ｍｍ未満であることが好ましく、規則正しく配列された複数のドットからなることが更に好ましい。また、パターン部が、図形、数字、記号若しくは文字である場合には、これらの形状が目視で認識できることが好ましい。このような寸法及び形状を示すことで更に意図的に形成されたと言える。また、非パターン部は、パターン部以外の領域である。また、パターン部の形状は、ドット抜けのように一部が欠けていても、全体として認識できれば許容される。また、非パターン部は、パターン部の境界を縁取るような形状であってもよい。
　なお、パターン部の視認性を向上させる観点から、パターン部が溶融めっき層の表面に占める面積率が、非パターン部よりも大幅に小さいことが好ましい。例えば、パターン部が溶融めっき層の表面に占める面積率が、３０％以下、２５％以下、２０％以下、又は１５％以下であることが好ましい。 Furthermore, the plating layer may have a patterned portion and a non-patterned portion. The pattern portion and the non-pattern portion may be arranged to have a predetermined shape. The pattern portion may be arranged to have a shape of any one of a straight line portion, a curved portion, a dot portion, a figure, a number, a symbol, or a character, or a combination of two or more of these. Furthermore, the pattern portions may be arranged in an intentional shape. It is preferable that the straight portions and curved portions in the pattern portion have a width that can be visually recognized, and each have a length of 1 mm or more. The dot portion in the pattern portion preferably has an equivalent circle diameter of 1 mm or more and less than 10 mm, and more preferably consists of a plurality of regularly arranged dots. Moreover, when the pattern portion is a figure, number, symbol, or character, it is preferable that these shapes can be visually recognized. By showing such dimensions and shape, it can be said that the shape was intentionally formed. Furthermore, the non-pattern portion is an area other than the pattern portion. Further, even if the shape of the pattern part is partially missing, such as a missing dot, it is acceptable as long as it can be recognized as a whole. Further, the non-pattern portion may have a shape that borders the pattern portion.
In addition, from the viewpoint of improving the visibility of the pattern part, it is preferable that the area ratio occupied by the pattern part on the surface of the hot-dip plating layer is significantly smaller than that of the non-pattern part. For example, it is preferable that the area ratio occupied by the pattern portion on the surface of the hot-dip plating layer is 30% or less, 25% or less, 20% or less, or 15% or less.
　パターン部及び非パターン部を備えためっき層の第１の例として、パターン部が、表面におけるＡｌ相の露出割合が３０面積％未満の領域であり、非パターン部が、表面におけるＡｌ相の露出割合が３０面積％以上の領域であるめっき層でもよい。
　第１の例における観察方法は、以下の通りである。
　溶融めっき鋼板は、鋼板と、鋼板の表面に形成された溶融めっき層と、を備える。溶融めっき層は、平均組成で、Ａｌ：４～２２質量％、Ｍｇ：１．０～１０質量％を含有し、残部がＺｎおよび不純物を含む。
　溶融めっき鋼板は、溶融めっき層に配置されたパターン部と、非パターン部とを備える。
　第１の例における溶融めっき鋼板の観察方法は、パターン部におけるＡｌ相の露出割合が３０面積％未満であり、非パターン部におけるＡｌ相の露出割合が３０面積％以上である溶融めっき鋼板を提供する。また、めっき層表面の観察領域に対する入射角が０°～３５°未満、８０°超～９０°以下のいずれかの範囲内の環境光を遮光しながら、溶融めっき層表面の観察領域に向けて照射角度３５°～８０°の範囲の照明光を照射する。また、めっき層表面の法線方向における、照明光に対する観察領域から反射光を観察する。
　また、めっき層の第２の例として、パターン部が、算術平均面粗さＳａが１μｍ未満の領域であり、非パターン部が、算術平均面粗さＳａが１μｍ以上の領域であるめっき層でもよい。
　第２の例における観察方法は、以下の通りである。
　溶融めっき鋼板は、鋼板と、鋼板の表面に形成された溶融めっき層と、を備える。溶融めっき層は、平均組成で、Ａｌ：４～２２質量％、Ｍｇ：１．０～１０質量％を含有し、残部がＺｎおよび不純物を含む。
　溶融めっき鋼板は、溶融めっき層に配置されたパターン部と、非パターン部とを備える。
　第２の例における溶融めっき鋼板の観察方法は、パターン部における算術平均面粗さＳａが１μｍ未満であり、非パターン部における算術平均面粗さＳａが１μｍ以上である溶融めっき鋼板を提供する。また、めっき層表面の観察領域に対する入射角が０°～３５°未満、８０°超～９０°以下のいずれかの範囲内の環境光を遮光しながら、溶融めっき層表面の観察領域に向けて照射角度３５°～８０°の範囲の照明光を照射する。また、めっき層表面の法線方向における、照明光に対する観察領域から反射光を観察する。 As a first example of a plating layer including a patterned portion and a non-patterned portion, the patterned portion is an area where the exposed ratio of Al phase on the surface is less than 30% by area, and the non-patterned portion is an area where the exposed Al phase on the surface is The plating layer may have an area having a ratio of 30% by area or more.
The observation method in the first example is as follows.
A hot-dip plated steel plate includes a steel plate and a hot-dip plated layer formed on the surface of the steel plate. The average composition of the hot-dip plating layer is Al: 4 to 22% by mass, Mg: 1.0 to 10% by mass, and the remainder contains Zn and impurities.
The hot-dip plated steel sheet includes a pattern portion and a non-pattern portion arranged in the hot-dip plating layer.
The method for observing a hot-dip galvanized steel sheet in the first example provides a hot-dip galvanized steel sheet in which the exposed proportion of the Al phase in the patterned part is less than 30 area %, and the exposed proportion of the Al phase in the non-patterned part is 30 area % or more. do. In addition, while blocking environmental light whose incident angle to the observation area on the surface of the plating layer is within the range of 0° to less than 35° or more than 80° to less than 90°, Illumination light with an irradiation angle in the range of 35° to 80° is irradiated. In addition, reflected light is observed from an observation area for the illumination light in the normal direction of the surface of the plating layer.
Further, as a second example of the plating layer, a plating layer in which the pattern portion is a region with an arithmetic mean surface roughness Sa of less than 1 μm and the non-pattern portion is a region with an arithmetic mean surface roughness Sa of 1 μm or more may also be used. good.
The observation method in the second example is as follows.
A hot-dip plated steel plate includes a steel plate and a hot-dip plated layer formed on the surface of the steel plate. The average composition of the hot-dip plating layer is Al: 4 to 22% by mass, Mg: 1.0 to 10% by mass, and the remainder contains Zn and impurities.
The hot-dip plated steel sheet includes a pattern portion and a non-pattern portion arranged in the hot-dip plating layer.
The method for observing a hot-dip-coated steel sheet in the second example provides a hot-dip-coated steel sheet in which the arithmetic mean surface roughness Sa in the pattern portion is less than 1 μm and the arithmetic mean surface roughness Sa in the non-pattern portion is 1 μm or more. In addition, while blocking environmental light whose incident angle to the observation area on the surface of the plating layer is within the range of 0° to less than 35° or more than 80° to less than 90°, Illumination light with an irradiation angle in the range of 35° to 80° is irradiated. In addition, reflected light is observed from an observation area for the illumination light in the normal direction of the surface of the plating layer.
　上記の第１の例のめっき層は、全体として梨地状の外観を呈するとともに、パターン部と非パターン部との金属光沢の違いおよび金属光沢の違いによる色調の違いにより、所定の形状のパターン部が非パターン部と区別して視認できるようになっている。上記の第２の例のめっき層を観察した場合もこれと同様である。 The plating layer of the first example above has a satin-like appearance as a whole, and due to the difference in metallic luster between the patterned part and the non-patterned part, and the difference in color tone due to the difference in metallic luster, the plating layer has a patterned part of a predetermined shape. can be visually distinguished from non-pattern areas. The same holds true when observing the plating layer of the second example above.
　更に、パターン部及び非パターン部を備えためっき層の第３の例として、鋼板表面の法線方向に対して入射角度０°～９０°未満の範囲の入射光に対する、法線方向へのパターン部の反射光および法線方向への非パターン部の反射光の関係が、下記式（１）および式（２）を満足するめっき層でもよい。 Furthermore, as a third example of a plating layer including a patterned portion and a non-patterned portion, a pattern in the normal direction for incident light having an incident angle in the range of 0° to less than 90° with respect to the normal direction of the steel sheet surface. The plating layer may be such that the relationship between the reflected light of the non-patterned part and the reflected light of the non-patterned part in the normal direction satisfies the following formulas (1) and (2).
｜ＩＰＨ－ＩＢＨ｜／｜ＩＰＭ－ＩＢＭ｜＜１．０　…（１）
｜ＩＰＬ－ＩＢＬ｜／｜ＩＰＭ－ＩＢＭ｜＜１．０　…（２） |I PH -I BH |/|I PM -I BM |<1.0...(1)
|I PL -I BL |/|I PM -I BM |<1.0...(2)
　但し、式（１）～（２）において、
ＩＰＨ：入射角度０°～３５°未満の入射光に対する、法線方向へのパターン部の反射強度、
ＩＢＨ：入射角度０°～３５°未満の入射光に対する、法線方向への非パターン部の反射強度、
ＩＰＭ：入射角度３５°～８０°の入射光に対する、法線方向へのパターン部の反射強度、
ＩＢＭ：入射角度３５°～８０°の入射光に対する、法線方向への非パターン部の反射強度、
ＩＰＬ：入射角度８０°超～９０°未満の入射光に対する、法線方向へのパターン部の反射強度、
ＩＢＬ：入射角度８０°超～９０°未満の入射光に対する、法線方向への非パターン部の反射強度、
である。
　なお、第３の例における溶融めっき鋼板は、鋼板と、鋼板の表面に形成された溶融めっき層と、を備え、溶融めっき層は、平均組成で、Ａｌ：４～２２質量％、Ｍｇ：１．０～１０質量％を含有し、残部がＺｎおよび不純物を含む。また、溶融めっき層に、上述のパターン部と、非パターン部とを備える。 However, in formulas (1) to (2),
I PH : Reflection intensity of the pattern portion in the normal direction for incident light with an incident angle of 0° to less than 35°,
I BH : Reflection intensity of the non-pattern part in the normal direction for incident light with an incident angle of 0° to less than 35°,
I PM : Reflection intensity of the pattern portion in the normal direction for incident light at an incident angle of 35° to 80°,
I BM : Reflection intensity of a non-pattern part in the normal direction for incident light at an incident angle of 35° to 80°,
I PL : Reflection intensity of the pattern portion in the normal direction for incident light with an incident angle of more than 80° to less than 90°,
I BL : Reflection intensity of the non-pattern part in the normal direction for incident light with an incident angle of more than 80° to less than 90°,
It is.
The hot-dip plated steel plate in the third example includes a steel plate and a hot-dip plated layer formed on the surface of the steel plate, and the average composition of the hot-dip plated layer is Al: 4 to 22% by mass, Mg: 1 .0 to 10% by mass, with the remainder containing Zn and impurities. Further, the hot-dip plating layer includes the above-described pattern portion and non-pattern portion.
　上記の第３の例のめっき層は、全体として梨地状の外観を呈するとともに、パターン部の反射光強度と非パターン部の反射光強度との違いにより、所定の形状のパターン部が非パターン部と区別して視認できるようになっている。 The plating layer of the third example above has a satin-like appearance as a whole, and due to the difference in the reflected light intensity of the patterned part and the reflected light intensity of the non-patterned part, the patterned part of the predetermined shape is different from the non-patterned part. It is now possible to distinguish and visually recognize it.
　そして、第１の例、第２の例および第３の例のめっき層は、図１（ａ）に示すように、めっき層の法線方向に対して入射角度３５°～８０°の範囲の光が入射した場合であって、めっき層を法線方向から観察したときに、パターン部が視認しやすくなる。一方、図１（ｂ）に示したように、めっき層の法線方向に対する入射角度が３５°～８０°以外の範囲から光が入射した場合であって、めっき層を法線方向からみたときには、パターン部が視認しにくくなる。 As shown in FIG. 1(a), the plating layers of the first example, the second example, and the third example have an incident angle in the range of 35° to 80° with respect to the normal direction of the plating layer. When light enters the plating layer and the plating layer is observed from the normal direction, the pattern portion becomes easier to see. On the other hand, as shown in FIG. 1(b), when the incident angle with respect to the normal direction of the plating layer is outside the range of 35° to 80°, and when the plating layer is viewed from the normal direction, , the pattern part becomes difficult to see.
　なお、本実施形態において観察対象となる溶融めっき鋼板は、上述しためっき鋼板に限定されるものではない。 Note that the hot-dip plated steel plate to be observed in this embodiment is not limited to the plated steel plate described above.
（観察装置）
　次に、本実施形態の溶融めっき鋼板の観察装置について説明する。本実施形態の観察装置１は、図２および図３に示すように、遮光箱２と、遮光箱２の内部に設置された環状光源３と、から構成される。 (Observation device)
Next, a hot-dip galvanized steel plate observation apparatus according to the present embodiment will be described. As shown in FIGS. 2 and 3, the observation device 1 of this embodiment includes a light-shielding box 2 and an annular light source 3 installed inside the light-shielding box 2.
　遮光箱２は、溶融めっき鋼板１０のめっき層１０ａ上に接して配置可能である。遮光箱２がめっき層１０ａ上に接して配置されることで、めっき層１０ａの一部が覆われる。遮光箱２に覆われためっき層１０ａにおいては、環境光の入射が遮光される。遮光箱２は、後述する観察領域Ｋに対する入射角が０°～３５°未満、８０°超～９０°以下のいずれかの範囲内の環境光を遮光することが好ましい。又、後述する観察窓２ｂからの環境光の入射を考慮すると、入射角が３°以上の環境光を遮光することが好ましい。入射角が０°～３５°未満、８０°超～９０°以下の環境光を遮光することで、めっき層の表面に表された文字やデザイン等のパターンを視認できるようになる。例えば、めっき層の表面に文字やデザイン等のパターン部が、主として鋼板表面に対して１７°～４０°の傾斜角度を有する微小な傾斜面によって構成されており、非パターン部が主として上記範囲外の傾斜角度を有する微小な傾斜面によって構成されている溶融めっき鋼板を観察する場合、入射光の入射角度を３５°～８０°のみに限定することで、パターン部の反射光の強度が非パターン部の反射光の強度よりも高まるため、反射光の強度差によってパターンをよく視認できるようになる。入射光の入射角度を３５°～８０°以外に限定した場合には上記の効果は得られない。
　なお、入射角が３５°～８０°の環境光を遮光しても良いことは言うまでもない。
　遮光箱２は、中空箱状であれば、その形状に制限はない。遮光箱２の形状は例えば、直方体状、円柱状、多角柱状であってもよい。遮光箱の内面は、環状光源３の反射を防止するため、黒色に着色されていることが好ましく、艶消し処理がされていることがさらに好ましい。 The light-shielding box 2 can be placed on and in contact with the plating layer 10a of the hot-dip plated steel plate 10. By placing the light-shielding box 2 in contact with the plating layer 10a, a part of the plating layer 10a is covered. The plating layer 10a covered by the light shielding box 2 blocks the incidence of environmental light. It is preferable that the light-shielding box 2 shields environmental light having an incident angle with respect to the observation area K, which will be described later, within a range of 0° to less than 35° and more than 80° to 90° or less. Further, considering the incidence of environmental light from the observation window 2b, which will be described later, it is preferable to block the environmental light having an incident angle of 3° or more. By blocking environmental light with an incident angle of 0° to less than 35° and more than 80° to less than 90°, patterns such as letters and designs expressed on the surface of the plating layer can be visually recognized. For example, pattern areas such as letters and designs on the surface of the plating layer are mainly composed of minute slopes with an angle of inclination of 17° to 40° with respect to the steel plate surface, and non-pattern areas are mainly outside the above range. When observing a hot-dip galvanized steel sheet that is made up of minute inclined surfaces with an inclination angle of Since the intensity of the reflected light is higher than that of the reflected light, the pattern can be clearly recognized due to the difference in the intensity of the reflected light. If the angle of incidence of the incident light is limited to a range other than 35° to 80°, the above effect cannot be obtained.
It goes without saying that environmental light having an incident angle of 35° to 80° may be blocked.
The shape of the light-shielding box 2 is not limited as long as it has a hollow box shape. The shape of the light shielding box 2 may be, for example, a rectangular parallelepiped, a cylinder, or a polygonal column. In order to prevent reflection of the annular light source 3, the inner surface of the light-shielding box is preferably colored black, and more preferably has a matte finish.
　遮光箱２には、めっき層１０ａ側に開口部２ａが設けられる。例えば、遮光箱２が直方体状、円柱状または多角形状である場合は、直方体、円柱または多角柱の下面に開口部２ａが設けられる。開口部２ａは、遮光箱２のめっき層１０ａ側の全部が開口部２ａとされてもよく、遮光箱２のめっき層１０ａ側に壁部が設けられ、当該壁部の一部を開口する開口部２ａが設けられていてもよい。開口部２ａを設けることによって、遮光箱２に覆われためっき層１０ａの表面が、外部からの環境光の入射が遮光された状態で、遮光箱２の内部に露出されるようになる。 The light-shielding box 2 is provided with an opening 2a on the plating layer 10a side. For example, when the light-shielding box 2 is a rectangular parallelepiped, a cylinder, or a polygon, the opening 2a is provided on the lower surface of the rectangular parallelepiped, cylinder, or polygon. The opening 2a may be the entirety of the plating layer 10a side of the light-shielding box 2, or the opening 2a may be formed by providing a wall portion on the plating layer 10a side of the light-shielding box 2 and opening a part of the wall portion. A portion 2a may be provided. By providing the opening 2a, the surface of the plating layer 10a covered by the light-shielding box 2 is exposed to the inside of the light-shielding box 2, with the incidence of environmental light from the outside being blocked.
　遮光箱２には、開口部２ａと対向する位置に、めっき層１０ａの表面（めっき層表面）を臨む観察窓２ｂが設けられる。観察窓２ｂは、開口部２ａに対向配置する。例えば、遮光箱２が直方体状、円柱状または多角形状である場合は、直方体、円柱または多角柱の上面に観察窓２ｂが設けられる。観察窓２ｂは、開口部２ａによって遮光箱２内部に露出されるめっき層１０ａを観察するために設けられる。観察窓２ｂは、開口部２ａに対向する面の一部に設けられていればよい。観察窓２ｂの開口面積が大きすぎると、観察窓２ｂからめっき層１０ａの表面に入射する環境光の光量が多くなり、めっき層１０ａの観察に支障をきたすようになるので好ましくない。よって、観察窓２ｂの開口面積は、環境光の影響がない程度に調整するとよい。また、観察窓２ｂは、撮像装置（図示なし）が取り付け可能であってもよい。更に、観察窓２ｂに撮像装置が取り付けられた場合、撮像装置によって環境光を遮光することが好ましい。 The light-shielding box 2 is provided with an observation window 2b facing the surface of the plating layer 10a (the surface of the plating layer) at a position facing the opening 2a. The observation window 2b is arranged to face the opening 2a. For example, when the light-shielding box 2 is a rectangular parallelepiped, a cylinder, or a polygon, the observation window 2b is provided on the upper surface of the rectangular parallelepiped, cylinder, or polygon. The observation window 2b is provided to observe the plating layer 10a exposed inside the light shielding box 2 through the opening 2a. The observation window 2b may be provided on a part of the surface facing the opening 2a. If the opening area of the observation window 2b is too large, the amount of environmental light that enters the surface of the plating layer 10a from the observation window 2b will increase, which is not preferable because it will interfere with the observation of the plating layer 10a. Therefore, the opening area of the observation window 2b should be adjusted to such an extent that it will not be affected by environmental light. Furthermore, an imaging device (not shown) may be attached to the observation window 2b. Furthermore, when an imaging device is attached to the observation window 2b, it is preferable that the imaging device blocks out environmental light.
　遮光箱２内に配置される環状光源３は、観察孔３ａを有する環状支持体３ｂと、複数の光源３ｃ（例えば発光ダイオード３ｃ、以下発光ダイオード３ｃと称す）とを備えることが望ましい。環状支持体３ｂには、観察窓２ｂと開口部２ａを結ぶ貫通孔である観察孔３ａがあり、また、環状支持体３ｂは、内周面３ｄを有し、内周面３ｄに囲まれた領域が観察孔３ａとなる。発光ダイオード３ｃは、この内周面３ｄに配設されている。発光ダイオード３ｃは、内周面３ｄの周方向に沿って、例えば一列に並んで配置されている。環状光源３の発光ダイオードの発光色は特に制限されるわけではないが、観察領域Ｋを視認しやすくするため、白色光とすることが好ましい。なお、発光ダイオード３ｃの配置位置は、観察領域Ｋに対する照明光の入射角（照射角度）が３５°～８０°となればよく、内周面３ｄに限らない。又、光源３ｃは、発光ダイオード３ｃに替えて、白熱灯や有機ＥＬ等の他の光源を用いても構わない。 It is preferable that the annular light source 3 placed in the light shielding box 2 includes an annular support 3b having an observation hole 3a and a plurality of light sources 3c (for example, light emitting diodes 3c, hereinafter referred to as light emitting diodes 3c). The annular support 3b has an observation hole 3a which is a through hole connecting the observation window 2b and the opening 2a, and the annular support 3b has an inner circumferential surface 3d surrounded by the inner circumferential surface 3d. The area becomes the observation hole 3a. The light emitting diode 3c is arranged on this inner peripheral surface 3d. The light emitting diodes 3c are arranged, for example, in a line along the circumferential direction of the inner peripheral surface 3d. Although the color of light emitted from the light emitting diode of the annular light source 3 is not particularly limited, it is preferable to use white light in order to make the observation area K easier to see. Note that the light emitting diode 3c may be disposed at a position where the incident angle (irradiation angle) of the illumination light with respect to the observation area K is 35° to 80°, and is not limited to the inner circumferential surface 3d. Further, as the light source 3c, other light sources such as an incandescent lamp or an organic EL may be used instead of the light emitting diode 3c.
　環状光源３の形状は、平面視円形の観察孔３ａを有する円環状であってもよく、平面視多角形状の観察孔３ａを有する多角環状であってもよい。角を４つ以上有する多角形の場合は全ての角が９０°以上の鈍角であることが好ましい。特に好ましい形状は、平面視円形の観察孔３ａを有する円環状である。これにより、めっき層１０ａの観察領域Ｋに対して複数の発光ダイオード３ｃから均等な光を照射可能になる。 The shape of the annular light source 3 may be an annular shape having an observation hole 3a that is circular in plan view, or may be a polygonal annular shape having an observation hole 3a that is polygonal in plan view. In the case of a polygon having four or more corners, all corners are preferably obtuse angles of 90° or more. A particularly preferred shape is an annular shape having the observation hole 3a which is circular in plan view. This makes it possible to irradiate uniform light from the plurality of light emitting diodes 3c onto the observation area K of the plating layer 10a.
　環状光源３は、遮光箱２の内部にあって、開口部２ａと観察窓２ｂとの間に配置されている。また、環状光源３の観察孔３ａの中心を通る中心線上に観察窓２ｂが配置されていることが好ましい。より好ましくは、環状光源３は、観察孔３ａの中心が、観察窓２ｂの中心に一致するように配置されているとよい。これにより、観察窓２ｂの視野と観察孔３ａとが重なり、観察者や図示しない撮像装置は、観察窓２ｂおよび観察孔３ａを通して、開口部２ａに露出するめっき層１０ａの表面を、めっき層１０ａの法線方向から観察することが可能になる。 The annular light source 3 is located inside the light shielding box 2 and between the opening 2a and the observation window 2b. Further, it is preferable that the observation window 2b is arranged on a center line passing through the center of the observation hole 3a of the annular light source 3. More preferably, the annular light source 3 is arranged such that the center of the observation hole 3a coincides with the center of the observation window 2b. As a result, the field of view of the observation window 2b overlaps with the observation hole 3a, and an observer or an imaging device (not shown) can see the surface of the plating layer 10a exposed in the opening 2a through the observation window 2b and the observation hole 3a. It becomes possible to observe from the normal direction.
　環状光源３の電源は、屋内又は屋外に設置された固定電源のほか、バッテリー等のポータブル電源であってもよい。環状光源３の照明光の照度は、観察したいめっき層１０ａの表面の状態に合わせて、照度を変更できることが好ましい。
　発光ダイオード３ｃから発した照明光の一部は、環状光源３の下方に位置するめっき層１０ａの表面のうち、観察窓２ｂの直下に位置する領域に照射される。この領域を観察領域Ｋという。観察領域Ｋには、めっき層１０ａの表面の法線方向に対して入射角度３５°～８０°の範囲の照明光が環状光源３によって照射される。そして、観察領域Ｋからめっき層１０ａの法線方向に反射した反射光が、観察窓２ｂから取り出される。 The power source for the annular light source 3 may be a fixed power source installed indoors or outdoors, or a portable power source such as a battery. It is preferable that the illuminance of the illumination light from the annular light source 3 can be changed depending on the state of the surface of the plating layer 10a to be observed.
A portion of the illumination light emitted from the light emitting diode 3c is irradiated onto a region of the surface of the plating layer 10a located below the annular light source 3, located directly below the observation window 2b. This area is called an observation area K. The annular light source 3 irradiates the observation area K with illumination light having an incident angle in the range of 35° to 80° with respect to the normal direction of the surface of the plating layer 10a. Then, reflected light reflected from the observation area K in the normal direction of the plating layer 10a is extracted from the observation window 2b.
　ここで、本実施形態の照明光の入射角度について図４を参照して説明する。図４には、環状光源３から観察領域Ｋに向けて照射される照明光を示す。図４に示すように、環状光源３の発光ダイオード３ｃは、観察領域Ｋを囲むように配置されている。環状光源３の各発光ダイオード３ｃは、観察領域Ｋの斜め上の方向に位置している。そして、各発光ダイオード３ｃは、観察領域Ｋのうち、観察領域Ｋの中央位置Ｏよりも各発光ダイオード３ｃに近い領域に照明光を照射するように、その照射範囲が設定されている。ただし、各発光ダイオード３ｃの照射範囲は、各発光ダイオード３ｃに近い領域のみに限定されるものではなく、発光ダイオード３ｃの特性に合わせて照射範囲が広がってもよい。一つの発光ダイオード３ｃに着目すると、図４に示すように、その発光ダイオード３ｃから観察領域Ｋの中央位置Ｏ付近に照射される照明光の照射角度θ１は、観察領域Ｋの外周付近に照射される光の照射角度θ２よりも小さくなる。本実施形態では、観察領域Ｋの中央位置Ｏ付近に照射される照明光の照射角度θ１が３５°以上となり、観察領域Ｋの外周付近に照射される光の照射角度θ２が８０°以下となるように、環状光源３と観察領域Ｋとの位置関係を設定する。これにより、観察領域Ｋの全領域には、めっき層１０ａの表面の法線方向に対して入射角度３５°～８０°の範囲の照明光が照射されるようになる。 Here, the incident angle of illumination light in this embodiment will be explained with reference to FIG. 4. FIG. 4 shows illumination light emitted toward the observation area K from the annular light source 3. As shown in FIG. 4, the light emitting diodes 3c of the annular light source 3 are arranged to surround the observation area K. Each light emitting diode 3c of the annular light source 3 is located diagonally above the observation area K. The irradiation range of each light emitting diode 3c is set so as to irradiate illumination light to an area of the observation area K that is closer to each light emitting diode 3c than the center position O of the observation area K. However, the irradiation range of each light emitting diode 3c is not limited to only the area close to each light emitting diode 3c, and the irradiation range may be expanded according to the characteristics of the light emitting diode 3c. Focusing on a single light emitting diode 3c, as shown in FIG. is smaller than the irradiation angle θ2 of the light. In this embodiment, the irradiation angle θ1 of the illumination light irradiated near the center position O of the observation area K is 35° or more, and the irradiation angle θ2 of the light irradiated near the outer periphery of the observation area K is 80° or less. The positional relationship between the annular light source 3 and the observation area K is set as follows. As a result, the entire observation area K is irradiated with illumination light having an incident angle of 35° to 80° with respect to the normal direction of the surface of the plating layer 10a.
　本実施の形態の観察装置は上述の溶融めっき鋼板の検査装置に好適に使用される。図５は本実施の形態に係る検査装置１００の一例を示す図である。検査装置１００は、溶融めっき鋼板を搬送する搬送装置１０１、観察装置１、表示装置１０２、支柱１０３を備える。観察装置１は、支柱１０３に支持されることで、検査対象である溶融めっき鋼板１０の上に配置される。このとき、溶融めっき鋼板１０の表面に対する観察方向が自在に変更できることが好ましい。観察装置１の観察窓２ｂには撮像装置４が取り付けられ、開口部２ａを介して溶融めっき鋼板１０の表面画像を撮像する。撮像された表面画像は表示装置１０２にて視認可能に表示される。観察装置１は、遮光箱２と観察対象である溶融めっき鋼板との境界における遮光性を高めるため、遮光箱２と溶融めっき鋼板１０との間に遮光シール２ｃを備えることが好ましい。遮光シール２ｃは例えば、柔軟な布地（例えば、フェルト生地）や軟らかいブラシのように、搬送される溶融めっき鋼板１０の表面を傷つけない軟らかさであることが好ましい。このような検査装置１００を用いることで、周囲が環境光によって明るい状況であっても、高速で移動する溶融めっき鋼板１０上に設けられたパターン部Ｐ（例えば、マークやコード）を精度よく読み取ることが可能となる。なお、検査装置１００は観察装置とも称しても良い。すなわち、観察装置１が搬送装置１０１、表示装置１０２、支柱１０３のいずれかを備えてもよい。 The observation device of this embodiment is suitably used in the above-mentioned inspection device for hot-dip plated steel sheets. FIG. 5 is a diagram showing an example of the inspection device 100 according to this embodiment. The inspection device 100 includes a conveyance device 101 that conveys a hot-dipped steel plate, an observation device 1, a display device 102, and a support 103. The observation device 1 is supported by a support column 103 and is placed above the hot-dip plated steel plate 10 to be inspected. At this time, it is preferable that the observation direction with respect to the surface of the hot-dip plated steel sheet 10 can be changed freely. An imaging device 4 is attached to the observation window 2b of the observation device 1, and captures a surface image of the hot-dip plated steel plate 10 through the opening 2a. The captured surface image is visibly displayed on the display device 102. The observation device 1 preferably includes a light-shielding seal 2c between the light-shielding box 2 and the hot-dip-plated steel plate 10 in order to improve the light-shielding property at the boundary between the light-shielding box 2 and the hot-dip-plated steel plate 10 to be observed. The light-shielding seal 2c is preferably made of a soft material such as a soft cloth (for example, felt cloth) or a soft brush so as not to damage the surface of the hot-dip plated steel plate 10 being conveyed. By using such an inspection device 100, even if the surroundings are bright due to ambient light, the pattern portion P (for example, mark or code) provided on the hot-dipped steel plate 10 moving at high speed can be read with high accuracy. becomes possible. Note that the inspection device 100 may also be referred to as an observation device. That is, the observation device 1 may include any one of the transport device 101, the display device 102, and the support 103.
（溶融めっき鋼板の観察方法）
　次に、本実施形態の溶融めっき鋼板の観察方法を説明する。
　本実施形態の観察方法は、図２および図３に示すように、溶融めっき鋼板１０のめっき層１０ａの表面に、先に説明した観察装置１を設置し、観察装置１に備えられた環状光源３を点灯し、観察装置１に設けられた観察窓２ｂから、めっき層１０ａの表面の観察領域Ｋを観察するというものである。 (Method for observing hot-dip galvanized steel sheets)
Next, a method for observing a hot-dip plated steel sheet according to this embodiment will be explained.
As shown in FIGS. 2 and 3, in the observation method of this embodiment, the above-described observation device 1 is installed on the surface of the plating layer 10a of the hot-dipped steel plate 10, and the annular light source provided in the observation device 1 is used. 3 is turned on, and an observation area K on the surface of the plating layer 10a is observed through an observation window 2b provided in the observation device 1.
　具体的には、まず、溶融めっき鋼板１０のめっき層１０ａの表面に、観察装置１を設置する。パターン部及び非パターン部を有するめっき層１０ａを観察する場合は、環状光源３の観察孔３ａの直下の観察領域Ｋ内に、パターン部とともに非パターン部が収まるようにすることが望ましい。パターン部及び非パターン部を有しないめっき層１０ａを観察する場合は、環状光源３の観察孔３ａの直下の観察領域Ｋ内に、めっき層１０ａの任意の領域が収まるようにすればよい。遮光箱２によって、めっき層１０ａの表面の観察領域Ｋへの環境光の入射が遮断される。 Specifically, first, the observation device 1 is installed on the surface of the plating layer 10a of the hot-dip plated steel plate 10. When observing the plating layer 10a having a patterned portion and a non-patterned portion, it is desirable that the non-patterned portion is contained in the observation area K directly under the observation hole 3a of the annular light source 3 together with the patterned portion. When observing the plating layer 10a that does not have a patterned portion or a non-patterned portion, any region of the plating layer 10a may be placed within the observation area K directly under the observation hole 3a of the annular light source 3. The light-shielding box 2 blocks environmental light from entering the observation area K on the surface of the plating layer 10a.
　この状態で、環状光源３を点灯する。環状光源３は、めっき層１０ａの表面の観察領域Ｋに向けて照明光を照射する。照明光は、環状光源３の下方に位置するめっき層１０ａの表面のうち、環状光源３の開口部２ａの直下に位置する観察領域Ｋに主に照射される。めっき層１０ａの表面の観察領域Ｋには、めっき層１０ａの表面の法線方向に対して入射角度３５°～８０°の範囲の照明光が照射される。また、めっき層１０ａの表面の観察領域Ｋには、他の入射角の環境光の入射が制限される。 In this state, the annular light source 3 is turned on. The annular light source 3 irradiates illumination light toward an observation area K on the surface of the plating layer 10a. The illumination light is mainly irradiated onto the observation area K located directly under the opening 2a of the annular light source 3 on the surface of the plating layer 10a located below the annular light source 3. The observation area K on the surface of the plating layer 10a is irradiated with illumination light having an incident angle in the range of 35° to 80° with respect to the normal direction to the surface of the plating layer 10a. Furthermore, the incidence of environmental light at other angles of incidence is restricted into the observation area K on the surface of the plating layer 10a.
　めっき層１０ａの表面に入射した照明光は、めっき層１０ａの表面において反射されて反射光となる。反射光のうち、めっき層１０ａの表面の法線方向に向けて反射した反射光が、観察窓２ｂから観察装置１の外部に出射される。出射された反射光は、観察窓２ｂからめっき層１０ａを臨む観察者の目に届き、これにより、観察者は、観察領域Ｋのめっき層１０ａの形態を視認する。 The illumination light incident on the surface of the plating layer 10a is reflected on the surface of the plating layer 10a and becomes reflected light. Among the reflected lights, the reflected light that is reflected in the direction normal to the surface of the plating layer 10a is emitted to the outside of the observation device 1 through the observation window 2b. The emitted reflected light reaches the eyes of an observer who views the plating layer 10a through the observation window 2b, and thereby the observer visually recognizes the form of the plating layer 10a in the observation area K.
　第１の例のパターン部および非パターン部を備えためっき層１０ａを観察した場合は、全体として梨地状の外観が観察されるとともに、パターン部及び非パターン部における金属光沢の違いおよび金属光沢の違いに伴う色調、特に明度の違いにより、所定の形状のパターン部が視認される。第２の例のパターン部と非パターン部を備えためっき層１０ａを観察した場合もこれと同様である。 When the plating layer 10a having the patterned portion and the non-patterned portion of the first example is observed, a satin-like appearance is observed as a whole, and a difference in metallic luster between the patterned portion and the non-patterned portion and a difference in the metallic luster are observed. A pattern portion having a predetermined shape can be visually recognized due to the difference in color tone, especially the difference in brightness. This is also the case when observing the plating layer 10a having patterned portions and non-patterned portions in the second example.
　第３の例のパターン部および非パターン部を備えためっき層１０ａを観察した場合は、全体として梨地状の外観が観察されるとともに、パターン部及び非パターン部における反射光の反射強度の違いにより、所定の形状のパターン部が視認される。 When the plating layer 10a of the third example including the patterned portion and the non-patterned portion is observed, a satin-like appearance is observed as a whole, and due to the difference in the reflection intensity of the reflected light in the patterned portion and the non-patterned portion, , a pattern portion having a predetermined shape is visually recognized.
　また、パターン部および非パターン部を備えていないめっき層１０ａを観察した場合は、梨地状の外観を安定して観察できるようになる。 Furthermore, when observing the plating layer 10a that does not include patterned portions and non-patterned portions, a satin-like appearance can be stably observed.
　一方、観察装置１を用いずに溶融めっき鋼板１０を観察する場合として、環境光が十分に明るい場合、すなわち光量が十分であって不特定方向からの環境光の下で、めっき層１０ａを観察する場合がある。以下、これを第１の比較環境という。 On the other hand, when observing the hot-dip plated steel sheet 10 without using the observation device 1, the plating layer 10a is observed when the ambient light is sufficiently bright, that is, when the amount of light is sufficient and the ambient light is from an unspecified direction. There are cases where Hereinafter, this will be referred to as the first comparison environment.
　また、環境光の考量が不十分な場合であって、入射角度３５°～８０°以外の方向からの照明光の下で、めっき層１０ａを観察する場合がある。以下、これを第２の比較環境という。 Furthermore, there are cases where the environmental light is insufficiently considered and the plating layer 10a is observed under illumination light from a direction other than the incident angle of 35° to 80°. Hereinafter, this will be referred to as the second comparison environment.
　第１の比較環境において、上記の第１の例のめっき層１０ａを観察すると、パターン部及び非パターン部における金属光沢に違いが視認できず、これによりパターン部が視認できず、一様な梨地模様として観察されるおそれがある。また、不特定の方向からの環境光が入射することで、梨地状の模様に部分的に明度の濃淡が発生するおそれがある。第１の比較環境において第２の例のめっき層１０ａを観察した場合もこれと同様になる。 In the first comparison environment, when observing the plating layer 10a of the first example above, there is no visible difference in the metallic luster between the patterned area and the non-patterned area, and as a result, the patterned area is not visible and the plating layer 10a has a uniform satin finish. There is a risk that it will be observed as a pattern. In addition, there is a risk that the satin-like pattern may be partially shaded due to the incidence of environmental light from an unspecified direction. This is also the case when the plating layer 10a of the second example is observed in the first comparison environment.
　また、第２の比較環境において、第１の例および第２の例のめっき層１０ａをそれぞれ観察した場合も、上記と同様にパターン部が視認できず、一様な梨地模様として観測される、あるいは梨地模様に部分的に明度の濃淡が発生する恐れがある。 Furthermore, when the plating layers 10a of the first example and the second example are observed in the second comparative environment, the pattern portions are not visible and are observed as a uniform satin pattern, as in the above case. Alternatively, there is a possibility that the satin-finished pattern may have partial brightness shading.
　次に、第１の比較環境において、パターン部および非パターン部を有しないめっき層１０ａを観察すると、めっき層１０ａからの反射光が過剰になって梨地状の模様が観察しにくくなるか、または、めっき層１０ａからの反射光が弱くなりすぎて、梨地状の模様が観察しにくくなり、安定して梨地模様を観察しにくくなるおそれがある。 Next, in the first comparative environment, when observing the plating layer 10a that does not have a patterned portion and a non-patterned portion, the reflected light from the plating layer 10a becomes excessive, making it difficult to observe the satin-like pattern, or There is a possibility that the reflected light from the plating layer 10a becomes too weak, making it difficult to observe the satin-like pattern and making it difficult to stably observe the satin-like pattern.
　以上説明したように、本実施形態の溶融めっき鋼板の観察装置１および観察方法によれば、遮光箱２によって観察対象のめっき層１０ａへの不特定方向からの環境光の入射を制限した上で、遮光箱２の内部に備えられた環状光源３によって、環状光源３の開口部２ａの直下に位置するめっき層１０ａの表面の観察領域Ｋに向けて照射角度３５°～８０°の範囲の照明光を照射することにより、溶融めっき鋼板１０のめっき層１０ａの表面を、環境光の影響を受けない一定の条件下で観察することを可能になる。これにより、めっき層１０ａの表面に表された、主として凹凸によって形成された文字やデザイン等のパターンが観察しやすくなり、また、めっき層１０ａの梨地模様を安定して観察することができる。特に、めっき層１０ａへの光線の入射角度によって、文字やデザイン等のパターンの視認性が変化するようなめっき層１０ａに対して、本発明を好適に適用できる。 As explained above, according to the observation apparatus 1 and the observation method for hot-dip coated steel sheets of the present embodiment, the light-shielding box 2 restricts the incidence of environmental light from an unspecified direction onto the plating layer 10a to be observed. The annular light source 3 provided inside the light-shielding box 2 illuminates the observation area K of the surface of the plating layer 10a located directly under the opening 2a of the annular light source 3 at an irradiation angle of 35° to 80°. By irradiating with light, it becomes possible to observe the surface of the plating layer 10a of the hot-dip plated steel sheet 10 under certain conditions that are not affected by environmental light. This makes it easier to observe patterns such as letters and designs mainly formed by unevenness on the surface of the plating layer 10a, and also allows stable observation of the satin pattern of the plating layer 10a. In particular, the present invention can be suitably applied to a plating layer 10a in which the visibility of patterns such as letters and designs changes depending on the angle of incidence of light rays on the plating layer 10a.
　また、本実施形態の溶融めっき鋼板の観察装置１によれば、観察孔３ａを有する環状支持体３ｂと、環状支持体３ｂの内周面３ｄにあって、内周面３ｄの周方向に沿って配置された複数の発光ダイオード３ｃとを備えた環状光源３が備えられている。又、複数の発光ダイオードは観察領域Ｋに対して対称的、あるいは等間隔に配置することが好ましい。このような構成により、観察孔３ａの下方に位置するめっき層１０ａの表面の観察領域Ｋに対して、ムラのない照明光を照射することができる。これにより、めっき層１０ａの表面に表された文字やデザイン等のパターンがより観察しやすくなり、また、めっき層１０ａの梨地模様をより安定して観察することができる。又、遮光する領域も観察領域Ｋに対して全方位をカバーすることが好ましい。 Moreover, according to the hot-dipped steel sheet observation apparatus 1 of the present embodiment, the annular support 3b having the observation hole 3a and the inner circumferential surface 3d of the annular support 3b are provided along the circumferential direction of the inner circumferential surface 3d. An annular light source 3 including a plurality of light emitting diodes 3c arranged in a row is provided. Further, it is preferable that the plurality of light emitting diodes be arranged symmetrically or at equal intervals with respect to the observation area K. With such a configuration, the observation area K on the surface of the plating layer 10a located below the observation hole 3a can be irradiated with even illumination light. This makes it easier to observe patterns such as letters and designs on the surface of the plating layer 10a, and it is also possible to more stably observe the satin pattern of the plating layer 10a. Further, it is preferable that the light-blocking area also cover all directions with respect to the observation area K.
　また、本実施形態の溶融めっき鋼板の観察装置１によれば、観察窓２ｂに撮像装置が装着可能とされているので、めっき層１０ａの表面の撮影が可能にある。 Furthermore, according to the hot-dip plated steel plate observation apparatus 1 of this embodiment, since an imaging device can be attached to the observation window 2b, it is possible to photograph the surface of the plating layer 10a.
　また、本実施形態の溶融めっき鋼板の観察装置１によれば、観察孔３ａの中心を通る中心線上に観察窓２ｂが配置されているので、めっき層１０ａの表面の法線方向に向かう反射光を観察窓２ｂから取り出すことができ、めっき層１０ａの表面に表された文字やデザイン等のパターンがより観察しやすくなり、また、めっき層１０ａの梨地模様をより安定して観察することができる。 In addition, according to the hot-dipped steel sheet observation apparatus 1 of the present embodiment, since the observation window 2b is arranged on the center line passing through the center of the observation hole 3a, reflected light directed in the normal direction of the surface of the plating layer 10a can be taken out from the observation window 2b, making it easier to observe patterns such as letters and designs on the surface of the plating layer 10a, and making it possible to more stably observe the satin pattern of the plating layer 10a. .
　次に、本発明の実施例を説明する。
（試験例１）
　鋼板を脱脂、水洗した後に、還元焼鈍、めっき浴浸漬、付着量制御、冷却を行うことで、表１に示す化学組成を有するめっき層を備えたＮｏ．Ａ１～Ａ１０の溶融めっき鋼板を製造した。 Next, examples of the present invention will be described.
(Test example 1)
After degreasing and washing the steel plate with water, reduction annealing, immersion in a plating bath, coating amount control, and cooling were performed to form No. 1 steel plate having a plating layer having the chemical composition shown in Table 1. Hot-dip galvanized steel sheets A1 to A10 were manufactured.
　得られた溶融めっき鋼板を日中の屋外に持ち出し、図２および図３に示す観察装置を用いて、めっき層表面の観察を行った。また、比較例として、観察装置を用いずに、めっき層表面の観察を行った。その結果、表２に示すように、観察装置を利用した発明例の場合は、めっき層に対して３５°～８０°の範囲で入射光が入射されたため、めっき層の梨地模様を安定して観察することができた。一方、観察装置を利用しなかった比較例の場合は、３５°～８０°の範囲からの光に加えて、３５°～８０°以外の方向からの光が入射したため、めっき層の梨地模様が視認しにくい場合があった。 The obtained hot-dip plated steel sheet was taken outdoors during the day, and the surface of the plating layer was observed using the observation apparatus shown in FIGS. 2 and 3. Furthermore, as a comparative example, the surface of the plating layer was observed without using an observation device. As a result, as shown in Table 2, in the case of the invention example using the observation device, the incident light was incident on the plating layer in the range of 35° to 80°, so the satin pattern of the plating layer could be stably maintained. I was able to observe it. On the other hand, in the case of the comparative example in which no observation device was used, in addition to the light from the range of 35° to 80°, light from directions other than 35° to 80° was incident, resulting in a satin pattern on the plating layer. There were times when it was difficult to see.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
（試験例２）
　鋼板を脱脂、水洗した後に、５０ｍｍ間隔の碁盤目状パターンが転写された形状をもつゴム版に、炭素を含むインキを付着させ、このゴム版を鋼板に押し付けることで、インキを鋼板に付着させた。その後、還元焼鈍、めっき浴浸漬、付着量制御、冷却を行うことで、表１に示す化学組成を有するめっき層を備え、かつ、表面に碁盤目状のパターン部を備えたＮｏ．Ｂ１～Ｂ８の溶融めっき鋼板を製造した。これにより、予め設定された位置にパターン部の成形されることになる。 (Test example 2)
After degreasing the steel plate and washing it with water, ink containing carbon is applied to a rubber plate with a 50 mm interval transfer grid pattern transferred thereto, and this rubber plate is pressed against the steel plate to cause the ink to adhere to the steel plate. Ta. Thereafter, by performing reduction annealing, immersion in a plating bath, controlling the coating amount, and cooling, No. Hot-dip galvanized steel sheets B1 to B8 were manufactured. As a result, the pattern portion is formed at a preset position.
［表面粗さＲａの測定方法］
　表面粗さＲａは、予め設定された位置のパターン部と非パターン部のそれぞれの領域に対して、めっき層の表面を原子間力顕微鏡（ＡＦＭ）で撮像し、得られた画像より２５μｍ四方の視野を５つ用意し、各視野において粗さ曲線をそれぞれ測り、５つの視の算術平均粗さ（Ｒａ）の平均値を求めた。この算術平均粗さ（Ｒａ）の平均値を表面粗さＲａとした。 [Method for measuring surface roughness Ra]
The surface roughness Ra is determined by imaging the surface of the plating layer with an atomic force microscope (AFM) for each region of the patterned part and the non-patterned part at preset positions, and Five visual fields were prepared, the roughness curves were measured in each visual field, and the average value of the arithmetic mean roughness (Ra) of the five visual fields was determined. The average value of this arithmetic mean roughness (Ra) was defined as the surface roughness Ra.
［Ａｌ相の露出割合の評価方法］
　予め設定された位置のパターン部と非パターン部のそれぞれの領域に対して、めっき層表面の複数箇所を撮影した１００倍の走査型電子顕微鏡写真を５枚用意し、得られた画像より８００μｍ視野を５つ用意し、市販の画像解析ソフトにより、溶融めっき層表面に露出したＡｌ相の面積をそれぞれ測り、５枚の写真におけるＡｌ相の露出面積の平均値を求めた。そして、Ａｌ相の露出面積の平均値を観察視野の全面積で除することにより、観察視野におけるＡｌ相の平均露出面積率（％）を求めた。このＡｌ相の平均露出面積率（％）をＡｌ相の露出割合とした。 [Method for evaluating exposure ratio of Al phase]
Prepare five 100x scanning electron micrographs of multiple locations on the surface of the plating layer for each of the patterned and non-patterned areas at preset positions, and use the obtained images to obtain a field of view of 800 μm. Five photographs were prepared, and the area of the Al phase exposed on the surface of the hot-dip plating layer was measured using commercially available image analysis software, and the average value of the exposed area of the Al phase in the five photographs was determined. Then, the average exposed area ratio (%) of the Al phase in the observation field was determined by dividing the average value of the exposed area of the Al phase by the total area of the observation field. The average exposed area ratio (%) of this Al phase was defined as the exposed ratio of the Al phase.
　得られた溶融めっき鋼板を日中の屋外に持ち出し、図２および図３に示す観察装置を用いて、めっき層表面に形成されたパターン部の観察を行った。また、比較例として、観察装置を用いずに、めっき層表面のパターン部の観察を行った。その結果、表３に示すように、観察装置を利用した実施例では、めっき層に対して３５°～８０°の範囲で入射光が入射されたため、めっき層のパターン部を明瞭に観察することができた。一方、比較例では、３５°～８０°の範囲からの光に加えて、３５°～８０°以外の方向からの光が入射したため、めっき層のパターン部が視認しにくくなった。 The obtained hot-dip plated steel sheet was taken outdoors during the day, and the pattern portion formed on the surface of the plating layer was observed using the observation apparatus shown in FIGS. 2 and 3. Moreover, as a comparative example, the pattern portion on the surface of the plating layer was observed without using an observation device. As a result, as shown in Table 3, in the example using the observation device, the incident light was incident on the plating layer at an angle of 35° to 80°, making it difficult to clearly observe the patterned portion of the plating layer. was completed. On the other hand, in the comparative example, in addition to light from a range of 35° to 80°, light from directions other than 35° to 80° was incident, making it difficult to see the patterned portion of the plating layer.
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
（試験例３）
　鋼板を脱脂、水洗した後に、還元焼鈍、めっき浴浸漬、付着量制御、冷却を行うことで、表１に示す化学組成を有するめっき層を備えた溶融めっき鋼板を製造した。
次いで、溶融めっき層の表面温度を２５０℃～３００℃にした状態で、一辺が５０ｍｍの正方形パターンを有するロールＡ～Ｂを、溶融めっき層の表面に押し付けることでパターン部を形成した。正方形パターンを有するロールＡ～Ｂの詳細は表４の通りとした。正方形パターンの箇所をパターン部とし、正方形パターン以外の箇所を非パターン部とした。このようにして、表１に示す化学組成を有するめっき層を備え、かつ、表面にパターン部および非パターン部を備えたＮｏ．Ｃ１～Ｃ８の溶融めっき鋼板を製造した。これにより、予め設定された位置にパターン部の成形されることになる。 (Test example 3)
After degreasing and washing the steel plate with water, reduction annealing, immersion in a plating bath, coating amount control, and cooling were performed to produce a hot-dip plated steel plate having a plating layer having the chemical composition shown in Table 1.
Next, with the surface temperature of the hot-dip plating layer set at 250° C. to 300° C., rolls A to B having a square pattern each side of which is 50 mm were pressed against the surface of the hot-dip plating layer to form a pattern portion. Details of rolls A to B having square patterns are shown in Table 4. The area with the square pattern was defined as a pattern part, and the area other than the square pattern was defined as a non-pattern area. In this way, No. 1, which was provided with a plating layer having the chemical composition shown in Table 1, and which had a patterned portion and a non-patterned portion on the surface. Hot-dip galvanized steel sheets of C1 to C8 were manufactured. As a result, the pattern portion is formed at a preset position.
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000004
｜ＩＰＨ－ＩＢＨ｜／｜ＩＰＭ－ＩＢＭ｜、｜ＩＰＬ－ＩＢＬ｜／｜ＩＰＭ－ＩＢＭ｜の測定
　得られた溶融めっき鋼板について、｜ＩＰＨ－ＩＢＨ｜／｜ＩＰＭ－ＩＢＭ｜および｜ＩＰＬ－ＩＢＬ｜／｜ＩＰＭ－ＩＢＭ｜を求めた。具体的には、めっき鋼板のめっき層表面をデジタル光学カメラで撮影して撮像データを得た。デジタル光学カメラで撮影する際は、めっき層表面をその垂直方向から撮影した。このとき、撮影光として、入射角度０°超～３５°未満、３５°～８０°、８０°超～９０°未満の入射角度の光を入射させて、各入射角度毎に撮影した。それぞれの入射角度には１０°以上の差をつけた。得られた撮像データから、各画素における光強度のデータを抽出した。一般に、画素の光強度のデータは、０を黒、２５５を白とする２５６階調の濃淡データで表されるので、このデータを抽出した。そして、パターン部に含まれる画素の光強度の平均値を、反射強度ＩＰＨ、ＩＢＨ、ＩＰＭ、ＩＢＭ、ＩＰＬ、ＩＢＬとした。これらの反射強度から、｜ＩＰＨ－ＩＢＨ｜／｜ＩＰＭ－ＩＢＭ｜および｜ＩＰＬ－ＩＢＬ｜／｜ＩＰＭ－ＩＢＭ｜の値を求めた。 Measurement of |I PH -I BH |/|I PM -I BM |, |I PL -I BL |/|I PM -I BM | Regarding the obtained hot-dip galvanized steel sheet, |I PH -I BH |/| I PM −I BM | and |I PL −I BL |/|I PM −I BM | were determined. Specifically, the surface of the plating layer of the plated steel sheet was photographed with a digital optical camera to obtain imaging data. When photographing with a digital optical camera, the surface of the plating layer was photographed from the perpendicular direction. At this time, light having an incident angle of more than 0° to less than 35°, 35° to 80°, and more than 80° to less than 90° was incident as photographing light, and images were taken for each incident angle. A difference of 10° or more was made between each incident angle. Light intensity data at each pixel was extracted from the obtained imaging data. Generally, data on the light intensity of a pixel is expressed as gradation data of 256 gradations, where 0 is black and 255 is white, so this data was extracted. The average values of the light intensities of the pixels included in the pattern portion were defined as the reflection intensities I PH , I BH , I PM , I BM , I PL , and I BL . From these reflection intensities, the values of |I PH -I BH |/|I PM -I BM | and |I PL -I BL |/|I PM -I BM | were determined.
　なお、パターン部及び非パターン部の境界の判別が難しい例では、ロール表面の正方形パターンに対応する箇所がパターン部であるとして｜ＩＰＨ－ＩＢＨ｜／｜ＩＰＭ－ＩＢＭ｜および｜ＩＰＬ－ＩＢＬ｜／｜ＩＰＭ－ＩＢＭ｜の値を求めた。 In addition, in an example where it is difficult to distinguish the boundary between the pattern part and the non-pattern part, assuming that the part corresponding to the square pattern on the roll surface is the pattern part, |I PH -I BH |/|I PM -I BM | and |I The value of PL −I BL |/|I PM −I BM | was determined.
　得られた溶融めっき鋼板を日中の屋外に持ち出し、図２および図３に示す観察装置を用いて、めっき層表面に形成されたパターン部の観察を行った。また、比較例として、観察装置を用いずに、めっき層表面のパターン部の観察を行った。その結果、表５に示すように、観察装置を利用した発明例の場合は、Ｃ１～Ｃ８のいずれにおいても、めっき層に対して３５°～８０°の範囲で入射光が入射されたため、めっき層のパターン部を明瞭に観察することができた。一方、観察装置を用いなかった比較例の場合は、Ｃ１～Ｃ８のいずれにおいても、３５°～８０°の範囲からの光に加えて、３５°～８０°以外の方向からの光が入射したため、めっき層のパターン部が視認しにくかった。 The obtained hot-dip plated steel sheet was taken outdoors during the day, and the pattern portion formed on the surface of the plating layer was observed using the observation apparatus shown in FIGS. 2 and 3. Moreover, as a comparative example, the pattern portion on the surface of the plating layer was observed without using an observation device. As a result, as shown in Table 5, in the case of the invention example using the observation device, the incident light was incident on the plating layer in the range of 35° to 80° in all of C1 to C8, so the plating The pattern of the layer could be clearly observed. On the other hand, in the case of the comparative example in which no observation device was used, in addition to the light from the range of 35° to 80°, light from directions other than 35° to 80° was incident on all of C1 to C8. , it was difficult to visually recognize the pattern part of the plating layer.
Figure JPOXMLDOC01-appb-T000005
Figure JPOXMLDOC01-appb-T000005
　１…観察装置、２…遮光箱、２ａ…開口部、２ｂ…観察窓、３…環状光源、３ａ…観察孔、３ｂ…環状支持体、３ｃ…光源（発光ダイオード）、３ｄ…内周面、１０…溶融めっき鋼板、１０ａ…めっき層、Ｋ…観察領域。 1... Observation device, 2... Light shielding box, 2a... Opening, 2b... Observation window, 3... Annular light source, 3a... Observation hole, 3b... Annular support, 3c... Light source (light emitting diode), 3d... Inner peripheral surface, DESCRIPTION OF SYMBOLS 10... Hot-dip plated steel plate, 10a... Plating layer, K... Observation area.

Claims (14)

  1. 　平均組成で、Ａｌ：０～９０質量％、Ｍｇ：０～１０質量％を含有し、残部がＺｎおよび不純物を含むめっき層を備えた溶融めっき鋼板の前記めっき層の表面を観察する観察装置であり、
    　前記めっき層上に接して配置可能であって前記めっき層表面への環境光の入射を遮光する遮光箱と、
    　前記遮光箱の内部に設置された、観察孔を有する環状光源と、が備えられ、
    　前記遮光箱は、前記めっき層表面を前記遮光箱の内部に露出させるための開口部と、前記開口部に対向配置する観察窓と、を備え、
    　前記環状光源は、前記開口部と前記観察窓との間に配置されるとともに、前記開口部の直下に位置する前記めっき層表面の観察領域に向けて照射角度３５°～８０°の範囲の照明光を照射する、溶融めっき鋼板の観察装置。     An observation device for observing the surface of the plating layer of a hot-dip galvanized steel sheet having a plating layer containing Al: 0 to 90% by mass, Mg: 0 to 10% by mass, and the balance containing Zn and impurities in average composition. can be,
    a light-shielding box that can be placed in contact with the plating layer and blocks environmental light from entering the surface of the plating layer;
    an annular light source having an observation hole installed inside the light-shielding box;
    The light-shielding box includes an opening for exposing the surface of the plating layer inside the light-shielding box, and an observation window disposed opposite to the opening,
    The annular light source is disposed between the opening and the observation window, and emits illumination at an irradiation angle of 35° to 80° toward an observation area on the surface of the plating layer located directly below the opening. An observation device for hot-dipped steel sheets that irradiates light.
  2. 　前記環状光源は、前記観察孔を有する環状支持体と、前記環状支持体の内周面にあって、前記内周面の周方向に沿って配置された複数の光源と、から構成される、請求項１に記載の溶融めっき鋼板の観察装置。 The annular light source includes an annular support having the observation hole, and a plurality of light sources disposed on an inner circumferential surface of the annular support and along a circumferential direction of the inner circumferential surface. The hot-dip galvanized steel sheet observation device according to claim 1.
  3. 　前記観察窓に、撮像装置が装着可能とされている、請求項１に記載の溶融めっき鋼板の観察装置。 The hot-dipped steel plate observation device according to claim 1, wherein an imaging device can be attached to the observation window.
  4. 　前記観察窓に、撮像装置が装着された、請求項１に記載の溶融めっき鋼板の観察装置。 The hot-dipped steel plate observation device according to claim 1, wherein the observation window is equipped with an imaging device.
  5. 　前記観察孔の中心を通る中心線上に前記観察窓が配置されている、請求項１に記載の溶融めっき鋼板の観察装置。 The hot-dipped steel plate observation device according to claim 1, wherein the observation window is arranged on a center line passing through the center of the observation hole.
  6. 　前記めっき層表面の観察領域に対する入射角が０°～３５°未満、８０°超～９０°以下のいずれかの範囲内の環境光を遮光する、請求項１に記載の溶融めっき鋼板の観察装置。 The apparatus for observing a hot-dipped steel sheet according to claim 1, which blocks environmental light having an incident angle with respect to the observation area of the surface of the plating layer within a range of 0° to less than 35° and more than 80° to 90° or less. .
  7. 　平均組成で、Ａｌ：０～９０質量％、Ｍｇ：０～１０質量％を含有し、残部がＺｎおよび不純物を含むめっき層を備えた溶融めっき鋼板の前記めっき層の表面を観察する観察装置であり、
    　前記めっき層上に配置可能であって前記めっき層表面への環境光の入射を遮光する遮光箱と、
    　前記遮光箱の内部に設置された、観察孔を有する環状光源と、が備えられ、
    　前記遮光箱は、前記めっき層表面を前記遮光箱の内部に露出させるための開口部と、前記開口部に対向配置する観察窓と、を備え、
    　前記環状光源は、前記開口部と前記観察窓との間に配置されるとともに、前記開口部の直下に位置する前記めっき層表面の観察領域に向けて照射角度３５°～８０°の範囲の照明光を照射し、
    　前記環状光源は、前記観察孔を有する環状支持体と、前記環状支持体の内周面にあって、前記内周面の周方向に沿って配置された複数の光源と、から構成され、
    　前記観察孔の中心を通る中心線上に前記観察窓が配置されている、溶融めっき鋼板の観察装置。     An observation device for observing the surface of the plating layer of a hot-dip galvanized steel sheet having a plating layer containing Al: 0 to 90% by mass, Mg: 0 to 10% by mass, and the balance containing Zn and impurities in average composition. can be,
    a light-shielding box that can be placed on the plating layer and blocks environmental light from entering the surface of the plating layer;
    an annular light source having an observation hole installed inside the light-shielding box;
    The light-shielding box includes an opening for exposing the surface of the plating layer inside the light-shielding box, and an observation window disposed opposite to the opening,
    The annular light source is disposed between the opening and the observation window, and emits illumination at an irradiation angle of 35° to 80° toward an observation area on the surface of the plating layer located directly below the opening. irradiate light,
    The annular light source includes an annular support having the observation hole, and a plurality of light sources disposed on the inner peripheral surface of the annular support along the circumferential direction of the inner peripheral surface,
    An observation device for a hot-dipped steel plate, wherein the observation window is arranged on a center line passing through the center of the observation hole.
  8. 　鋼板と、前記鋼板の表面に形成された溶融めっき層と、を備え、
    　前記溶融めっき層は、平均組成で、Ａｌ：４～２２質量％、Ｍｇ：１．０～１０質量％を含有し、残部がＺｎおよび不純物を含み、
    　前記溶融めっき層の表面外観は梨地状であり、
    　前記溶融めっき層表面の観察領域に対する入射角が０°～３５°未満、８０°超～９０°以下のいずれかの範囲内の環境光を遮光しながら、前記溶融めっき層表面の観察領域に向けて照射角度３５°～８０°の範囲の照明光を照射することと、
    　前記溶融めっき層表面の法線方向における、前記照明光に対する前記観察領域から反射光を観察すること
    　を備える溶融めっき鋼板の観察方法。     comprising a steel plate and a hot-dip plating layer formed on the surface of the steel plate,
    The hot-dip plating layer has an average composition of Al: 4 to 22% by mass, Mg: 1.0 to 10% by mass, and the remainder contains Zn and impurities,
    The surface appearance of the hot-dip plating layer is satin-like,
    Aim at the observation area on the surface of the hot-dip plating layer while blocking environmental light whose incident angle to the observation area on the surface of the hot-dip plating layer is within a range of 0° to less than 35°, more than 80° to 90° or less. irradiating illumination light with an irradiation angle in the range of 35° to 80°;
    A method for observing a hot-dip plated steel sheet, comprising: observing reflected light from the observation area with respect to the illumination light in the normal direction of the surface of the hot-dip plated layer.
  9. 　鋼板と、前記鋼板の表面に形成された溶融めっき層と、を備え、
    　前記溶融めっき層は、平均組成で、Ａｌ：４～２２質量％、Ｍｇ：１．０～１０質量％を含有し、残部がＺｎおよび不純物を含み、
    　前記溶融めっき層に配置されたパターン部と、非パターン部とを備え、
    　前記パターン部におけるＡｌ相の露出割合が３０面積％未満であり、前記非パターン部におけるＡｌ相の露出割合が３０面積％以上である溶融めっき鋼板を提供することと、
    　前記溶融めっき層表面の観察領域に対する入射角が０°～３５°未満、８０°超～９０°以下のいずれかの範囲内の環境光を遮光しながら、前記溶融めっき層表面の観察領域に向けて照射角度３５°～８０°の範囲の照明光を照射することと、
    　前記溶融めっき層表面の法線方向における、前記照明光に対する前記観察領域から反射光を観察すること
    　を備える請求項８に記載の溶融めっき鋼板の観察方法。     comprising a steel plate and a hot-dip plating layer formed on the surface of the steel plate,
    The hot-dip plating layer has an average composition of Al: 4 to 22% by mass, Mg: 1.0 to 10% by mass, and the remainder contains Zn and impurities,
    comprising a pattern part and a non-pattern part arranged on the hot-dip plating layer,
    Provided is a hot-dip plated steel sheet, in which the exposed proportion of the Al phase in the patterned portion is less than 30 area %, and the exposed proportion of the Al phase in the non-patterned portion is 30 area % or more;
    Aim at the observation area on the surface of the hot-dip plating layer while blocking environmental light whose incident angle to the observation area on the surface of the hot-dip plating layer is within a range of 0° to less than 35°, more than 80° to 90° or less. irradiating illumination light with an irradiation angle in the range of 35° to 80°;
    The method for observing a hot-dip plated steel sheet according to claim 8, comprising: observing reflected light from the observation area with respect to the illumination light in the normal direction of the surface of the hot-dip plated layer.
  10. 　鋼板と、前記鋼板の表面に形成された溶融めっき層と、を備え、
    　前記溶融めっき層は、平均組成で、Ａｌ：４～２２質量％、Ｍｇ：１．０～１０質量％を含有し、残部がＺｎおよび不純物を含み、
    　前記溶融めっき層に配置されたパターン部と、非パターン部とを備え、
    　前記パターン部における算術平均面粗さＳａが１μｍ未満であり、前記非パターン部における算術平均面粗さＳａが１μｍ以上である溶融めっき鋼板を提供することと、
    　前記溶融めっき層表面の観察領域に対する入射角が０°～３５°未満、８０°超～９０°以下のいずれかの範囲内の環境光を遮光しながら、前記溶融めっき層表面の観察領域に向けて照射角度３５°～８０°の範囲の照明光を照射することと、
    　前記溶融めっき層表面の法線方向における、前記照明光に対する前記観察領域から反射光を観察すること
    　を備える請求項８に記載の溶融めっき鋼板の観察方法。     comprising a steel plate and a hot-dip plating layer formed on the surface of the steel plate,
    The hot-dip plating layer has an average composition of Al: 4 to 22% by mass, Mg: 1.0 to 10% by mass, and the remainder contains Zn and impurities,
    comprising a pattern part and a non-pattern part arranged on the hot-dip plating layer,
    Provided is a hot-dip plated steel sheet, wherein the patterned portion has an arithmetic mean surface roughness Sa of less than 1 μm, and the non-patterned portion has an arithmetic mean surface roughness Sa of 1 μm or more;
    Aim at the observation area on the surface of the hot-dip plating layer while blocking environmental light whose incident angle to the observation area on the surface of the hot-dip plating layer is within a range of 0° to less than 35°, more than 80° to 90° or less. irradiating illumination light with an irradiation angle in the range of 35° to 80°;
    The method for observing a hot-dip plated steel sheet according to claim 8, comprising: observing reflected light from the observation area with respect to the illumination light in the normal direction of the surface of the hot-dip plated layer.
  11. 　鋼板と、前記鋼板の表面に形成された溶融めっき層と、を備え、
    　前記溶融めっき層は、平均組成で、Ａｌ：４～２２質量％、Ｍｇ：１．０～１０質量％を含有し、残部がＺｎおよび不純物を含み、
    　前記溶融めっき層に、パターン部と、非パターン部とを備え、
    　前記鋼板表面の法線方向に対して入射角度０°～９０°未満の範囲の入射光に対する、前記法線方向への前記パターン部の反射光および前記法線方向への前記非パターン部の反射光の関係が、下記式（１）および式（２）を満足する、溶融めっき鋼板を提供することと、
    　前記溶融めっき層表面の観察領域に対する入射角が０°～３５°未満、８０°超～９０°以下のいずれかの範囲内の環境光を遮光しながら、前記溶融めっき層表面の観察領域に向けて照射角度３５°～８０°の範囲の照明光を照射することと、
    　前記溶融めっき層表面の法線方向における、前記照明光に対する前記観察領域から反射光を観察すること
    　を備える請求項８に記載の溶融めっき鋼板の観察方法。
    ｜ＩＰＨ－ＩＢＨ｜／｜ＩＰＭ－ＩＢＭ｜＜１．０　…（１）
    ｜ＩＰＬ－ＩＢＬ｜／｜ＩＰＭ－ＩＢＭ｜＜１．０　…（２）
    　但し、
    ＩＰＨ：入射角度０°～３５°未満の入射光に対する法線方向のパターン部の反射強度
    ＩＢＨ：入射角度０°～３５°未満の入射光に対する法線方向の非パターン部の反射強度
    ＩＰＭ：入射角度３５°～８０°の入射光に対する法線方向のパターン部の反射強度
    ＩＢＭ：入射角度３５°～８０°の入射光に対する法線方向の非パターン部の反射強度
    ＩＰＬ：入射角度８０°超～９０°未満の入射光に対する法線方向のパターン部の反射強度
    ＩＢＬ：入射角度８０°超～９０°未満の入射光に対する法線方向の非パターン部の反射強度     comprising a steel plate and a hot-dip plating layer formed on the surface of the steel plate,
    The hot-dip plating layer has an average composition of Al: 4 to 22% by mass, Mg: 1.0 to 10% by mass, and the remainder contains Zn and impurities,
    The hot-dip plating layer includes a pattern part and a non-pattern part,
    Reflection of light from the pattern portion in the normal direction and reflection from the non-pattern portion in the normal direction with respect to incident light having an incident angle in the range of 0° to less than 90° with respect to the normal direction of the steel plate surface. To provide a hot-dipped steel plate whose light relationship satisfies the following formulas (1) and (2);
    Aim at the observation area on the surface of the hot-dip plating layer while blocking environmental light whose incident angle to the observation area on the surface of the hot-dip plating layer is within a range of 0° to less than 35°, more than 80° to 90° or less. irradiating illumination light with an irradiation angle in the range of 35° to 80°;
    The method for observing a hot-dip plated steel sheet according to claim 8, comprising: observing reflected light from the observation area with respect to the illumination light in the normal direction of the surface of the hot-dip plated layer.
    |I PH -I BH |/|I PM -I BM |<1.0...(1)
    |I PL -I BL |/|I PM -I BM |<1.0...(2)
    however,
    I PH : Reflection intensity of the pattern part in the normal direction for incident light with an incident angle of 0° to less than 35° I BH : Reflection intensity of the non-pattern part in the normal direction to incident light with an incident angle of 0° to less than 35° I PM : Reflection intensity of the pattern part in the normal direction for incident light with an incident angle of 35° to 80° I BM : Reflection intensity of the non-pattern part in the normal direction to incident light with an incident angle of 35° to 80° I PL : Incident Reflection intensity of the pattern part in the normal direction for incident light at an angle of more than 80° to less than 90° I BL : Reflection intensity of the non-pattern part in the normal direction for incident light at an angle of incidence of more than 80° to less than 90°
  12. 　溶融めっき鋼板のめっき層表面に、請求項１に記載の溶融めっき鋼板の観察装置を設置し、前記観察装置に備えられた環状光源を点灯し、前記観察装置に設けられた観察窓から前記めっき層表面の前記観察領域を観察する、溶融めっき鋼板の観察方法。 The hot-dip-coated steel sheet observation device according to claim 1 is installed on the surface of the plating layer of the hot-dip-coated steel sheet, and the annular light source provided in the observation device is turned on, and the plating is observed through the observation window provided in the observation device. A method for observing a hot-dip galvanized steel sheet, the method comprising observing the observation area on the surface of the layer.
  13. 　請求項１に記載の観察装置と、
    　前記溶融めっき鋼板を搬送する搬送装置と、
    　前記観察窓に取り付けられ、前記開口部を介して前記溶融めっき鋼板の表面を撮像する撮像装置と、を具備する、検査装置。     The observation device according to claim 1;
    a conveyance device that conveys the hot-dipped steel plate;
    An inspection device comprising: an imaging device attached to the observation window and capturing an image of the surface of the hot-dip plated steel plate through the opening.
  14. 　前記観察装置は、前記遮光箱と前記溶融めっき鋼板との間に設けられる遮光シールを有し、
    　前記遮光シールは、生地又はブラシからなる、請求項１３に記載の検査装置。     The observation device includes a light-shielding seal provided between the light-shielding box and the hot-dip plated steel plate,
    The inspection device according to claim 13, wherein the light-shielding seal is made of fabric or a brush.
PCT/JP2023/021564 2022-06-10 2023-06-09 Device for observing hot-dipped steel sheet, and method for observing hot-dipped steel sheet WO2023238937A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10176991A (en) * 1996-10-14 1998-06-30 Sumitomo Metal Ind Ltd Method for detecting surface state of chromium-series stainless steel plate
WO2003010525A1 (en) * 2001-07-27 2003-02-06 Nippon Sheet Glass Co., Ltd. Method for evaluating contamination of object surface and imaging box used for this method
JP2018190572A (en) * 2017-04-29 2018-11-29 株式会社キーエンス Luminaire, and attachment for luminaire, and appearance inspection device
WO2019230894A1 (en) * 2018-05-30 2019-12-05 日本製鉄株式会社 Zn-Al-Mg-BASED HOT-DIP PLATED STEEL SHEET AND METHOD FOR PRODUCING SAME
JP2021085085A (en) * 2019-11-29 2021-06-03 日本製鉄株式会社 Hot-dip metal coated steel sheet

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10176991A (en) * 1996-10-14 1998-06-30 Sumitomo Metal Ind Ltd Method for detecting surface state of chromium-series stainless steel plate
WO2003010525A1 (en) * 2001-07-27 2003-02-06 Nippon Sheet Glass Co., Ltd. Method for evaluating contamination of object surface and imaging box used for this method
JP2018190572A (en) * 2017-04-29 2018-11-29 株式会社キーエンス Luminaire, and attachment for luminaire, and appearance inspection device
WO2019230894A1 (en) * 2018-05-30 2019-12-05 日本製鉄株式会社 Zn-Al-Mg-BASED HOT-DIP PLATED STEEL SHEET AND METHOD FOR PRODUCING SAME
JP2021085085A (en) * 2019-11-29 2021-06-03 日本製鉄株式会社 Hot-dip metal coated steel sheet

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