WO2023182398A1 - 溶融めっき鋼材 - Google Patents
溶融めっき鋼材 Download PDFInfo
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- WO2023182398A1 WO2023182398A1 PCT/JP2023/011387 JP2023011387W WO2023182398A1 WO 2023182398 A1 WO2023182398 A1 WO 2023182398A1 JP 2023011387 W JP2023011387 W JP 2023011387W WO 2023182398 A1 WO2023182398 A1 WO 2023182398A1
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- hot
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- dip
- plating layer
- corrosion resistance
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
-
- 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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
- C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising or reducing atmosphere
-
- 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
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
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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
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
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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
- C23C2/50—Controlling or regulating the coating processes
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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
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
Definitions
- the present invention relates to hot-dip galvanized steel materials. This application claims priority based on Japanese Patent Application No. 2022-046793 filed in Japan on March 23, 2022, the contents of which are incorporated herein.
- hot-dip Zn-Al-Mg plated steel material A steel material with a hot-dip Zn plating layer containing Al and Mg formed on the surface (hot-dip Zn-Al-Mg plated steel material) has excellent corrosion resistance. Therefore, hot-dip Zn--Al--Mg-based plated steel materials are widely used as materials for structural members that require corrosion resistance, such as building materials.
- Patent Document 1 includes a steel plate and a hot-dip coating layer formed on the surface of the steel plate, and the hot-dip coating layer has an average composition of Al: 0 to 90% by mass and Mg: 0 to 10% by mass.
- a pattern portion and a non-pattern portion are formed in the hot-dip plating layer. and one or two types of the second area, and the absolute value of the difference between the area ratio of the first area in the pattern part and the area ratio of the first area in the non-pattern part is 30% or more.
- a hot-dip plated steel sheet is described in which the first region is a region where the orientation ratio is 3.5 or more, and the second region is a region where the orientation ratio is less than 3.5.
- Patent Document 2 describes a steel plate and a hot-dip plated layer containing 4% by mass to 22% by mass of Al, 1% by mass to 5% by mass of Mg, and the balance containing Zn and unavoidable impurities.
- a Zn-Al-Mg hot-dip galvanized steel sheet is described in which the diffraction intensity ratio I(200)/I(111), which is the ratio of
- hot-dip galvanized steel materials for building materials such as roofs and wall materials have two types of corrosion resistance: one is the corrosion resistance of the coating layer itself without coating, and the other is the corrosion resistance after coating, which is the corrosion resistance when coated. A high level of both is required.
- Patent Document 1 defines a first region as a region in which the intensity ratio between the diffraction peak intensity I 0002 of the (0002) plane and the diffraction peak intensity I 10-11 of the (10-11) plane of the Zn phase is 3.5 or more,
- the area where the intensity ratio is less than 3.5 is defined as the second area, by setting the difference between the area ratio of the first area in the pattern part and the area ratio of the first area in the non-pattern part to 30% or more, It is said that letters and designs can be intentionally displayed on the surface of the plating layer, but corrosion resistance after painting has not been investigated.
- Patent Document 2 by controlling the orientation of the Al phase in the plating layer, the appearance of the plating layer is made to have a pear-like appearance with fine texture and many smooth glossy areas, but the corrosion resistance after coating has not been studied. Not yet.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hot-dip plated steel material that is superior in both flat section corrosion resistance and post-painting corrosion resistance.
- the present invention employs the following configuration.
- Steel materials and a hot-dip plating layer arranged on the surface of the steel material The chemical composition of the hot-dip plating layer is in mass%, Al: 10.0-30.0%, Mg: 3.0 to 15.0%, Fe: 0.01-15.0%, Si: 0 to 10.0%, Ni: 0-1.0%, Contains Ca: 0 to 4.0%, Furthermore, Sb: 0 to 0.5%, Pb: 0 to 0.5%, Cu: 0 to 1.0%, Sn: 0 to 2.0%, Ti: 0 to 1.0%, Cr: 0 ⁇ 1.0%, Nb: 0-1.0%, Zr: 0-1.0%, Mn: 0-1.0%, Mo: 0-1.0%, Ag: 0-1.0% , Li: 0-1.0%, La: 0-0.5%, Ce: 0-0.5%, B: 0-0.5%, Y: 0-0.5%, P: 0- 0.5%, Sr: 0-0.5%, Co: 0-0
- I(002) MgZn2 in formula (1a) is the (002) diffraction intensity of the MgZn two phase
- I(100) MgZn2 is the (100) diffraction intensity of the MgZn two phase
- I(101) MgZn2 is the (101) diffraction intensity of the MgZn two- phase
- I(111) ⁇ in equation (2a) is the (111) diffraction intensity of the ⁇ phase
- I(200) ⁇ is the (200) diffraction intensity of the ⁇ phase.
- I(002) MgZn2 in formula (1a) is the (002) diffraction intensity of the MgZn two phase
- I(100) MgZn2 is the (100) diffraction intensity of the MgZn two phase
- I(101) MgZn2 is the (101) diffraction intensity of the MgZn two- phase
- I(111) ⁇ in equation (2b) is the (111) diffraction intensity of the ⁇ phase
- I(200) ⁇ is the (200) diffraction intensity of the ⁇ phase.
- Sn in the chemical composition of the hot-dip plating layer is Sn: 0.05 to 0.5% in mass %,
- FIG. 1 is a schematic cross-sectional view of a hot-dip plated steel material according to an embodiment of the present invention.
- the present inventors conducted extensive studies to improve both the flat surface corrosion resistance and the post-painting corrosion resistance of the hot-dip Zn plating layer containing Al and Mg.
- a dense plane exists in each of the MgZn 2 phase and the ⁇ phase contained in the plating layer.
- the MgZn two- phase having a hexagonal crystal structure has a (002) close-packed plane.
- the ⁇ phase containing Al and a small amount of Zn and having a face-centered cubic structure has a (111) dense plane.
- the MgZn 2 phase and the ⁇ phase each have a property that the corrosion resistance of the crystal orientation plane corresponding to these dense planes is higher than that of the other crystal orientation planes.
- the present inventors set the (002) plane, which is a dense plane of two MgZn phases, and the (111) plane, which is a dense plane of ⁇ phase, to the surface of a hot-dip plating layer. I tried to orient them so that they were parallel to each other. As a result, it was found that such a hot-dip plated layer has significantly improved corrosion resistance after coating, and furthermore, that the corrosion resistance of the flat surface of the hot-dip plated layer is improved.
- the hot-dip plated steel material of the present embodiment includes a steel material and a hot-dip plating layer disposed on the surface of the steel material, and the chemical composition of the hot-dip plating layer is, in mass%, Al: 10.0 to 30.0%; Contains Mg: 3.0-15.0%, Fe: 0.01-15.0%, Si: 0-10.0%, Ni: 0-1.0%, Ca: 0-4.0% Furthermore, Sb: 0 to 0.5%, Pb: 0 to 0.5%, Cu: 0 to 1.0%, Sn: 0 to 2.0%, Ti: 0 to 1.0%, Cr : 0-1.0%, Nb: 0-1.0%, Zr: 0-1.0%, Mn: 0-1.0%, Mo: 0-1.0%, Ag: 0-1.0%.
- the hot-dip plated steel material has a diffraction intensity obtained from an X-ray diffraction measurement result of the plating layer that satisfies the relationships of the following formulas (1a) and (2).
- I(002) MgZn2 in formula (1a) is the (002) diffraction intensity of the MgZn two phase
- I(100) MgZn2 is the (100) diffraction intensity of the MgZn two phase
- I(101) MgZn2 is the (101) diffraction intensity of the MgZn two- phase
- I(111) ⁇ in equation (2) is the (111) diffraction intensity of the ⁇ phase
- I(200) ⁇ is the (200) diffraction intensity of the ⁇ phase. This is the diffraction intensity.
- the Al concentration and Mg concentration are in the range of Al: 15.0 to 30.0% and Mg: 5.0 to 10.0%, respectively, the above formula ( In place of 1a), it is preferable that the following equation (1b) is satisfied in addition to the above equation (2).
- the Al concentration and Mg concentration satisfy the ranges of Al: 10.0 to 30.0%, Mg: 3.0 to 15.0%, and Al: When satisfying the ranges of 15.0 to 30.0% and Mg: 5.0 to 10.0%, it is sufficient to satisfy the above formula (1a).
- the Al concentration and Mg concentration satisfy the ranges of Al: 10.0 to 30.0%, Mg: 3.0 to 15.0%, and Al: 15.0%.
- the ranges of 0 to 30.0% and Mg: 5.0 to 10.0% it is preferable to satisfy the above formula (1a) and further satisfy the following formula (1b).
- the content of each element in the chemical composition expressed as “%” means “mass%”.
- the content of elements in a chemical composition is sometimes expressed as element concentration (for example, Zn concentration, Mg concentration, etc.).
- Plant corrosion resistance refers to the property of the hot-dip plating layer (specifically, the Zn--Al--Mg alloy layer) itself being resistant to corrosion.
- Post-painting corrosion resistance refers to the property of the hot-dip plating layer itself being resistant to corrosion when the surface of the plating layer is coated.
- Hot-dip plating layer means a plating film produced by so-called hot-dip galvanizing.
- the hot-dip plated steel material 1 has a steel material 11.
- the shape of the steel material 11 is not particularly limited, and an example of the steel material 11 is a steel plate.
- the steel material 11 is, for example, a steel pipe, a civil engineering construction material (fence culvert, corrugated pipe, drain cover, sand prevention plate, bolt, wire mesh, guardrail, water-stop wall, etc.), a home appliance member (a casing of an outdoor unit of an air conditioner, etc.). etc.), automobile parts (suspension members, etc.), and may also be formed base steel materials.
- the forming process is, for example, various plastic working methods such as press working, roll forming, and bending.
- the steel material 11 is, for example, various steel materials such as general steel, Al-killed steel, ultra-low carbon steel, high carbon steel, various high-strength steels, and some high-alloy steels (such as steel containing reinforcing elements such as Ni and Cr). It can be done.
- the steel material 11 may be a hot rolled steel plate, hot rolled steel strip, cold rolled steel plate, cold rolled steel strip, etc. described in JIS G 3302:2010. There are no particular limitations on the method of manufacturing the steel plate (hot rolling method, pickling method, cold rolling method, etc.) and the specific manufacturing conditions.
- the use of a pre-plated steel material as the steel material 11 is not excluded, but it is preferable to use a steel material that is not pre-plated.
- a steel material that is not pre-plated As will be described later, by applying hot-dip plating to a steel material that has not been pre-plated and controlling the subsequent cooling conditions, it becomes easier to orient the crystal orientations of the MgZn two- phase and ⁇ -phase in a certain direction.
- the hot-dip plated steel material 1 according to this embodiment has a hot-dip plating layer 12 arranged on the surface of the steel material 11.
- the hot-dip plated layer 12 of the hot-dip plated steel material 1 according to the present embodiment is mainly composed of a Zn--Al--Mg alloy layer due to the chemical composition described below. Further, the hot-dip plated layer 12 of the hot-dip plated steel material 1 according to the present embodiment may include an Al--Fe alloy layer between the steel material 11 and the Zn--Al--Mg alloy layer.
- the hot-dip plating layer 12 may have a single layer structure of a Zn--Al--Mg alloy layer, or may have a laminated structure including a Zn--Al--Mg alloy layer and an Al--Fe alloy layer.
- the chemical composition of the hot-dip plating layer according to this embodiment is composed of Zn and other alloying elements.
- the chemical composition of the hot-dip plating layer will be explained in detail below. Note that elements whose lower limit concentration is 0% are not essential to solving the problems of the hot-dip plated steel material according to this embodiment, but may be included in the hot-dip plated layer for the purpose of improving properties. It is an arbitrary element that is allowed to be included.
- Al forms an ⁇ phase, which is a solid solution with Zn, and contributes to improving the corrosion resistance of the flat part, the corrosion resistance after painting, and the workability. Therefore, the Al concentration is set to 10.0% or more.
- the Al concentration may be 11.0% or more, 12.0% or more, or 15.0% or more.
- the Al concentration is set to 30.0% or less.
- the Al concentration may be 28.0% or less, 25.0% or less, or 20.0% or less.
- Mg is an essential element for ensuring corrosion resistance on flat surfaces and corrosion resistance after painting. Therefore, the Mg concentration is set to 3.0% or more.
- the Mg concentration may be 4.0% or more, 5.0% or more, or 6.0% or more.
- the Mg concentration is set to 15.0% or less.
- the Mg concentration may be 12.0% or less, 10.0% or less, or 8.0% or less.
- the concentration of Fe may be 0%.
- the hot-dip plating layer may contain 0.01% or more of Fe. It has been confirmed that when the Fe concentration is 15.0% or less, there is no adverse effect on the performance of the hot-dip plating layer.
- the Fe concentration may be, for example, 0.05% or more, 0.10% or more, 0.5% or more, or 1.0% or more.
- the Fe concentration may be, for example, 10.0% or less, 8.0% or less, or 6.0% or less. Since Fe may be mixed in from the base steel plate, the Fe concentration may be 0.05% or more.
- the Si concentration may be 0%.
- Si contributes to improving the corrosion resistance of the flat surface. Therefore, the Si concentration may be set to 0.05% or more, 0.1% or more, 0.2% or more, or 0.5% or more.
- the Si concentration is set to 10.0% or less.
- the Si concentration may be 8.0% or less, 7.0% or less, or 6.0% or less.
- Ni 0-100%
- Ni contributes to improving the corrosion resistance of the flat surface and the corrosion resistance after painting. Therefore, the Ni concentration may be set to 0.05% or more, 0.08% or more, or 0.1% or more.
- the Ni concentration is set to 1.0% or less.
- the Ni concentration may be 0.8% or less, 0.6% or less, or 0.5% or less.
- the Ca concentration may be 0%.
- Ca is an element that can adjust the optimal amount of Mg elution to impart corrosion resistance to flat surfaces. Therefore, the Ca concentration may be 0.05% or more, 0.1% or more, or 0.5% or more.
- the Ca concentration is set to 4.0% or less.
- the Ca concentration may be 3.5% or less, 3.0% or less, or 2.8% or less.
- the hot-dip plating layer according to this embodiment includes Sb: 0 to 0.5%, Pb: 0 to 0.5%, Cu: 0 to 1.0%, Sn: 0 to 2.0%, and Ti. : 0-1.0%, Cr: 0-1.0%, Nb: 0-1.0%, Zr: 0-1.0%, Mn: 0-1.0%, Mo: 0-1.0%.
- the concentrations of Sb and Pb may be 0%.
- Sb and Pb contribute to improving the corrosion resistance after painting. Therefore, the respective concentrations of Sb and Pb may be set to 0.05% or more, 0.10% or more, or 0.15% or more.
- each concentration of Sb and Pb is set to 0.5% or less.
- the respective concentrations of Sb and Pb may be 0.4% or less, 0.3% or less, or 0.25% or less.
- ⁇ Cu, Ti, Cr, Nb, Zr, Mn, Mo, Ag and Li 0 to 1.0% each>
- the concentrations of Cu, Ti, Cr, Nb, Zr, Mn, Mo, Ag, and Li may each be 0%.
- these contribute to improving corrosion resistance after painting. Therefore, the respective concentrations of Cu, Ti, Cr, Nb, Zr, Mn, Mo, Ag, and Li may be set to 0.05% or more, 0.08% or more, or 0.10% or more.
- the concentrations of Cu, Ti, Cr, Nb, Zr, Mn, Mo, Ag, and Li are excessive, the corrosion resistance of the flat surface deteriorates.
- the respective concentrations of Cu, Ti, Cr, Nb, Zr, Mn, Mo, Ag, and Li are 1.0% or less.
- the respective concentrations of Cu, Ti, Cr, Nb, Zr, Mn, Mo, Ag, and Li may be 0.8% or less, 0.7% or less, or 0.6% or less.
- the Sn concentration may be 0%.
- Sn is an element that forms an intermetallic compound with Mg and improves the corrosion resistance of the hot-dip plating layer after coating. Therefore, the Sn concentration may be set to 0.05% or more, 0.10% or more, 0.20% or more, or 0.30% or more. However, if the Sn concentration is excessive, the corrosion resistance of the flat surface will deteriorate. Therefore, the Sn concentration is set to 2.0% or less. The Sn concentration may be 0.8% or less, 0.7% or less, 0.6% or less, or 0.5% or less.
- the respective concentrations of La, Ce, B, Y, P and Sr may be 0%.
- La, Ce, B, Y, P and Sr contribute to improving the corrosion resistance after painting. Therefore, each of the concentrations of La, Ce, B, Y, P, and Sr may be set to 0.10% or more, 0.15% or more, or 0.20% or more.
- the concentrations of La, Ce, B, Y, P, and Sr are each set to 0.5% or less.
- the concentrations of La, Ce, B, Y, P, and Sr may be 0.4% or less and 0.3% or less, respectively.
- the respective concentrations of Co, Bi, In, V, and W may be 0%.
- Co, Bi, In, V, and W contribute to improving the corrosion resistance after painting. Therefore, each of the concentrations of Co, Bi, In, V, and W may be set to 0.10% or more, 0.15% or more, or 0.20% or more.
- each of the concentrations of Co, Bi, In, V, and W is set to 0.5% or less.
- the concentrations of Co, Bi, In, V, and W may be 0.4% or less and 0.3% or less, respectively.
- Zn and impurities The remaining components of the hot-dip plating layer according to this embodiment are Zn and impurities.
- Zn is an element that provides the hot-dip plating layer with corrosion resistance on a flat surface and corrosion resistance after painting.
- Impurities refer to components contained in raw materials or components mixed in during the manufacturing process, but not intentionally included. For example, trace amounts of components other than Fe may be mixed into the hot-dip plating layer as impurities due to mutual atomic diffusion between the steel material and the plating bath.
- the chemical components of the hot-dip plating layer are measured by the following method. First, an acid solution containing an inhibitor that suppresses corrosion of steel is used to peel off and dissolve the hot-dip plating layer. Next, the obtained acid solution is analyzed by inductively coupled plasma (ICP). Thereby, the chemical composition of the hot-dip plating layer can be obtained.
- the acid species is not particularly limited as long as it can dissolve the hot-dip plating layer. Note that the chemical composition measured by the above-mentioned means is the average chemical composition of the entire hot-dip plating layer.
- the metal structure of the hot-dip plated layer contains an ⁇ phase and two MgZn phases.
- the ⁇ phase and the MgZn two phases improve the flat surface corrosion resistance of the hot-dip plated layer. Further, as will be described later, by orienting the ⁇ phase and the MgZn two phases in a certain direction, the corrosion resistance of the hot-dip plated steel material after painting is improved, and the corrosion resistance of the flat surface is also improved.
- the area ratio of the ⁇ phase in the hot-dip plating layer is preferably 15 to 80%. Further, the area ratio of the MgZn two- phase is preferably 5 to 60%. The total area ratio of the ⁇ phase and the two MgZn phases is preferably 20% or more and 100% or less. However, this area ratio range is just an example, and the area fraction of the structure of the hot-dip plated layer according to the present invention is not limited to this range at all, and the hot-dip plated layer satisfies the following formula (1a) and It is sufficient if at least one of formula (1b) and formula (2) are satisfied.
- the hot-dip plating layer contains 0.05 to 0.5% Sn
- the Mg 2 Sn phase is definitely included in the hot-dip plating layer. Since the Mg 2 Sn phase is present in a small amount, its presence is confirmed by X-ray diffraction measurement. By containing the Mg 2 Sn phase in the hot-dip plating layer, the post-painting corrosion resistance of the hot-dip plating layer is further improved.
- the hot-dip plating layer may contain a phase other than the ⁇ phase and the MgZn two phases as the remainder.
- the hot-dip plated layer having the above chemical composition may include an ⁇ -Zn phase, an Al-Ca-Si phase, and the like.
- the contents of the ⁇ phase and the MgZn 2 phases are within the above-mentioned ranges, it is possible to ensure corrosion resistance on the flat surface and corrosion resistance after coating, so the structure of phases or structures other than the ⁇ phase and the MgZn 2 phases is not particularly limited.
- the Al concentration and Mg concentration are in the range of Al: 15.00 to 30.00% and Mg: 5.00 to 10.00%, respectively, the above formula ( In place of 1a), it is preferable that the following equation (1b) is satisfied in addition to the above equation (2).
- the Al concentration and Mg concentration satisfy the ranges of Al: 10.0 to 30.0%, Mg: 3.0 to 15.0%, and Al: When satisfying the ranges of 15.0 to 30.0% and Mg: 5.0 to 10.0%, it is sufficient to satisfy the above formula (1a).
- the Al concentration and Mg concentration satisfy the ranges of Al: 10.0 to 30.0%, Mg: 3.0 to 15.0%, and Al: 15.0%.
- the ranges of 0 to 30.0% and Mg: 5.0 to 10.0% it is preferable to satisfy the above formula (1a) and further satisfy the following formula (1b).
- I(002) MgZn2 is the (002) diffraction intensity of the MgZn two- phase
- I(100) MgZn2 is the (100) diffraction intensity of the MgZn two- phase
- I(101) MgZn2 is the (101) diffraction intensity of MgZn two- phase
- I(111) ⁇ in formula (2) is the (111) diffraction intensity of the ⁇ phase
- I(200) ⁇ is the (200) diffraction intensity of the ⁇ phase.
- the (002) plane which is the dense plane of the MgZn two phases, becomes , oriented parallel to the surface of the hot-dip plating layer.
- the Al concentration is 15.0 to 30.0% and the Mg concentration is 5.0 to 10.0%, it is more than 0.6 as shown in formula (1b).
- the upper limit of I(100) MgZn2 / ⁇ I(002) MgZn2 +I(101) MgZn2 ⁇ is 3.0 or less. Even if the orientation of the dense plane of the MgZn two- phase is maximized, the upper limit is 3.0.
- the upper limit of I(111) ⁇ /I(200) ⁇ is 40.0 or less. Even if the orientation of the dense plane of the ⁇ phase is maximized, the upper limit is 40.0.
- the MgZn two- phase having a hexagonal crystal structure has a (002) close-packed plane.
- the ⁇ phase containing Al and a small amount of Zn and having a face-centered cubic structure has a (111) dense plane.
- the MgZn 2 phase and the ⁇ phase each have a property that the corrosion resistance of the crystal orientation plane corresponding to these close-packed planes is higher than that of the other crystal orientation planes.
- the hot-dip plated layer that satisfies at least one of the above formulas (1a) and (1b) and (2) is such that the dense planes of the MgZn two phase and ⁇ phase are oriented parallel to the surface of the hot-dip plated layer. Become.
- the method for measuring the area ratio of MgZn two phases is as follows.
- the surface of the hot-dip plating layer of the sample cut to 30 mm x 30 mm is adjusted to be flat by mechanical polishing (for example, polishing with #2000 emery paper).
- the surface of the plating layer is chemically polished by colloidal polishing until the surface becomes mirror-like.
- the surface of the plated layer after polishing is observed using a scanning electron microscope (SEM).
- SEM scanning electron microscope
- SEM-EDS scanning electron microscope-Energy Dispersive spectroscopy
- a region where Mg: 20 to 40 at% and Zn: 50 to 80 at% is determined to be a phase in which Mg and Zn coexist (MgZn two phases).
- MgZn two phases the area ratio of the ⁇ phase and the MgZn two phases contained in the field of view is calculated by binarization using image analysis software.
- the method for measuring the area ratio of the ⁇ phase is as follows.
- the surface of the hot-dip plating layer of the sample cut to 30 mm x 30 mm is adjusted to be flat by mechanical polishing.
- the surface of the plating layer is chemically polished by colloidal polishing until the surface becomes mirror-like.
- the surface of the plating layer after polishing is observed by SEM. Specifically, an elemental distribution image is photographed using SEM-EDS at a magnification of 5000 times.
- a phase in which Al and Zn coexist is identified as an ⁇ phase.
- a region where Al: 40 to 95 at% and Zn: 0.5 to 50 at% is determined to be a phase in which Al and Zn coexist ( ⁇ phase).
- the area ratio of the ⁇ phase contained in the field of view is calculated by binarization using image analysis software.
- the method for measuring I(002) MgZn2 / ⁇ I(100) MgZn2 +I(101) MgZn2 ⁇ in formulas (1a) and (1b) is as follows. First, the surface of the hot-dip plating layer is mirror polished and, if necessary, chemically polished.
- an X-ray diffraction measurement was carried out with a limit slit width of 2 mm, a light receiving slit width of 8 mm, and a light receiving slit 2 open, and the measurement conditions were a scan speed of 5 deg./min, a step width of 0.01 deg, and a scan axis of 2 ⁇ (5 to 90 degrees).
- the diffraction intensity of the (100) plane (maximum intensity in the range of 19.67 ⁇ 0.2°) and the diffraction intensity of the (002) plane (in the range of 20.78 ⁇ 0.2°) of the MgZn two- phase.
- the diffraction intensity is the intensity excluding the background intensity.From the obtained diffraction intensity , I(002) MgZn2 / ⁇ I(100) MgZn2 +I(101) MgZn2 ⁇ .
- the method for measuring I(111) ⁇ /I(200) ⁇ in formula (2) is as follows. First, the surface of the hot-dip plating layer is mirror polished and, if necessary, chemically polished. Next, for example, X-ray diffraction measurement is performed using the same X-ray diffraction apparatus and measurement conditions as above. Then, the diffraction intensity of the (111) plane of the ⁇ phase (maximum intensity in the range of 38.47 ⁇ 0.2°), and the diffraction intensity of the (200) plane (maximum intensity in the range of 44.74 ⁇ 0.2°) Measure each. The diffraction intensity is the intensity excluding the background intensity. I(111) ⁇ /I(200) ⁇ is determined from the obtained diffraction intensity.
- whether or not the Mg 2 Sn phase is contained in the hot-dip plating layer is determined by whether or not a diffraction peak specific to Mg 2 Sn appears when performing the above-mentioned X-ray diffraction measurement.
- the amount of hot-dip plating layer deposited on one side may be, for example, within the range of 20 to 150 g/m 2 .
- the adhesion amount per side may be, for example, within the range of 20 to 150 g/m 2 .
- the adhesion amount per side By setting the adhesion amount per side to 20 g/m 2 or more, the flat surface corrosion resistance and post-painting corrosion resistance of the hot-dip plated steel material can be further improved.
- the amount of coating per side to 150 g/m 2 or less, the workability of the hot-dip plated steel material can be further improved.
- the method for manufacturing a hot-dip plated steel material according to this embodiment is not particularly limited.
- the hot-dip plated steel material according to this embodiment can be obtained.
- the method for producing hot-dip plated steel materials of the present embodiment includes annealing the steel material in a reducing atmosphere, immersing the steel material immediately after annealing in a hot-dip plating bath, and then pulling it out, thereby forming a hot-dip plating layer on the surface of the steel material. Next, cooling is performed by spraying cooling gas until the temperature of the hot-dip plating layer falls from the bath temperature to 300° C. or less.
- the steel material serving as the original plate is annealed in a reducing atmosphere.
- the reducing atmosphere and annealing conditions are not particularly limited. By this annealing, as much as possible of oxides existing on the surface of the steel material is removed.
- the steel material immediately after annealing is immersed in a hot-dip plating bath.
- the chemical composition of the hot-dip plating bath may be adjusted as appropriate so that the chemical composition of the hot-dip plating layer described above can be obtained.
- the temperature of the hot-dip plating bath is not particularly limited, and a temperature at which hot-dip plating can be performed can be appropriately selected.
- the plating bath temperature may be about 20° C. or more higher than the melting point of the plating bath.
- the steel material is pulled up from the hot-dip plating bath.
- the amount of the hot-dip coating layer can be controlled.
- the amount of adhesion of the hot-dip plating layer may be controlled by wiping the steel material to which the hot-dip plating layer has adhered.
- the amount of the hot-dip plating layer to be deposited is not particularly limited, and may be within the above-mentioned range, for example.
- the hot-dip plating layer is cooled. Cooling is performed by spraying cooling gas onto the steel material immediately after it has been pulled out of the hot-dip plating bath. Cooling by spraying cooling gas is performed continuously until the temperature of the hot-dip plating layer reaches 300° C. from the bath temperature.
- the cooling conditions below 300° C. are not particularly limited, and cooling may be performed by subsequently blowing cooling gas, or cooling may be performed naturally.
- the cooling start temperature is the temperature of the hot-dip plating bath -40°C or more and the temperature of the hot-dip plating bath or less.
- the cooling start temperature is lower than the temperature of the hot-dip plating bath -40°C, the plating is allowed to cool (for example, at a cooling rate of 2°C/s) before cooling starts. For this reason, many nucleations are formed during the hot-dip plating before the hot-dip plating is cooled down. This makes it difficult to control the orientation of the ⁇ phase and the MgZn two phases in the hot-dip plating layer in subsequent steps.
- a cooling zone For cooling by spraying cooling gas, a cooling zone is placed along the conveyance path of the steel material.
- the cooling zone is equipped with a plurality of blowing nozzles for cooling gas.
- the flux By setting the flux to 5000 L/min/m 2 or more, the hot-dip plating layer can be cooled to 300° C. or less in a relatively short time.
- the flow rate of the cooling gas is lowered while maintaining the cooling rate of the entire steel material, and thus the temperature of the cooling gas is lowered.
- the liquid phase on the surface of the plating layer is supercooled and becomes solidification nuclei, and crystallized substances increase, making it impossible to control orientation.
- the flux by setting the flux to 25,000 L/min/m 2 or less, cooling can be performed without imparting vibration to the steel material.
- the cooling gas to be sprayed is not particularly limited, and may be a non-oxidizing gas such as nitrogen, an inert gas such as argon, or air, or a mixed gas thereof.
- the shape of the gas nozzle from which the cooling gas is spouted is, for example, in the range of 1 to 50 mm in diameter.
- the angle between the tip of the gas nozzle and the surface of the steel plate is, for example, in the range of 70 to 110°, more preferably 90° (right angle).
- the distance between the tip of the gas nozzle and the steel plate shall be in the range of 30 to 1000 mm. Note that the shape, angle, and distance of the gas nozzle are merely examples, and are not limited to the above ranges.
- the number of nucleation sites is reduced by annealing the steel material in a reducing atmosphere immediately before immersing it in a hot-dip plating bath to remove oxides on the surface of the steel material.
- hot-dip plating is performed on such a steel material
- Fe in the steel material and Al in the hot-dip plating bath react to form an Al--Fe alloy layer on the surface of the steel material.
- the Al--Fe alloy layer has relatively few nucleation sites.
- cooling gas is sprayed at a flux of 5,000 L/min/m 2 to 25,000 L/min/m 2 to avoid vibrations on the steel material as much as possible, thereby reducing the nucleation site. further suppresses production. It is presumed that as a result, the ⁇ phase and the MgZn two phases in the hot-dip plating layer are oriented in a certain direction, and the above formula (1a) or (1b) and formula (2) are satisfied.
- the shape of the gas nozzle from which the cooling gas was ejected was 6 mm in diameter, the angle between the tip of the gas nozzle and the steel plate was a right angle, and the distance between the tip of the gas nozzle and the steel plate was 35 mm.
- the chemical composition of the hot-dip plating layer was as shown in Table 1.
- the manufacturing conditions were as shown in Table 2.
- the metal structure of the plating layer was evaluated, and the results are shown in Table 2.
- the surface corrosion resistance and post-painting corrosion resistance of the hot-dip plated steel materials were evaluated, and the results are shown in Table 3.
- the chemical composition of the hot-dip plated layer and the metal structure of the hot-dip plated layer were evaluated by the means described above.
- the evaluation of corrosion resistance of the flat part was as follows.
- the obtained hot-dip plated steel material was cut into pieces of 100 mm x 50 mm and subjected to a flat part corrosion resistance evaluation test.
- the flat part corrosion resistance was evaluated by an accelerated corrosion test specified by JASO-CCT-M609, and after 120 cycles, the corrosion weight loss was compared.
- the evaluation criteria were as follows, and "AAA”, "AA”, and "A" were regarded as passing.
- AAA Corrosion weight loss 40 g/m 2 or less AA: Corrosion weight loss 40 g/m 2 or more and 60 g/m 2 or less A: Corrosion weight loss 60 g/m 2 or more and 80 g/m 2 or less B: Corrosion weight loss 80 g/m 2 or more
- the evaluation of post-painting corrosion resistance was as follows.
- the obtained hot-dip plated steel material was cut into 100 mm x 50 mm and subjected to a corrosion resistance test after painting.
- a chemical conversion treatment layer with a thickness of 1.2 ⁇ m and a coating layer with a thickness of 20 ⁇ m on the test piece
- cut flaws reaching the base metal with a cutter knife were applied to the front surface.
- 120 cycles of CCT were performed, with one cycle consisting of 4 hours of SST ⁇ 2 hours of drying ⁇ 2 hours of wetness, and evaluation was performed.
- Judgment was made based on the maximum swelling width on one side of the cut wound after the test was completed. Details of the chemical conversion treatment layer and the coating layer were as follows.
- ⁇ Chemical conversion treatment layer> A chromate-free chemical conversion treatment solution containing a silane coupling agent, tannic acid, silica, and polyester resin was applied to the plating layer and dried to form a chemical conversion treatment film.
- a paint film layer was formed by applying a primer paint resin and a top coat paint resin described below on the chemical conversion treatment film.
- the thickness of the layer made of primer paint resin was 5 ⁇ m, and the thickness of the layer made of top coat paint resin was 15 ⁇ m, for a total of 20 ⁇ m.
- ⁇ Film-forming components of the coating layer> (1) Primer paint resin for front and back surfaces Polyester/melamine + isocyanate combination curing type (FLC687 paint resin manufactured by Nippon Fine Coatings Co., Ltd.) (2) Top coat paint resin on the front surface High molecular polyester/melamine curing type (FLC7000 paint resin manufactured by Nippon Fine Coatings Co., Ltd.) (3) Back top coat paint resin Polyester/melamine curing type (FLC100HQ paint resin manufactured by Nippon Fine Coatings)
- AAA Maximum swelling width less than 5mm AA: Maximum swelling width 5mm or more and less than 8mm A: Maximum swelling width 8mm or more and less than 10mm B: Maximum swelling width 10mm or more
- No. 1 according to the present invention in which the chemical composition and metal structure of the hot-dip plated layer were appropriately controlled.
- Examples 1 to 25 were excellent in both flat surface corrosion resistance and post-painting corrosion resistance.
- the adhesion amount of the hot-dip plating layer in the example was in the range of 20 to 150 g/m 2 .
- Comparative example No. 26 the amount of Al in the hot-dip plating layer was insufficient. Therefore, No. In No. 26, the flat surface corrosion resistance was insufficient. Comparative example No. In No. 27, the amount of Al in the hot-dip plating layer was excessive. Therefore, No. In No. 27, the corrosion resistance after painting was insufficient.
- Comparative example No. 28 the amount of Mg in the hot-dip plating layer was insufficient. Therefore, No. In No. 28, both the flat part corrosion resistance and the post-painting corrosion resistance were insufficient. Comparative example No. In No. 29, the amount of Mg in the hot-dip plating layer was excessive. Therefore, No. In No. 29, the corrosion resistance of the flat part was insufficient.
- Comparative example No. 34 the gas flux of the cooling gas was excessive. Therefore, No. In No. 34, the ⁇ phase and the MgZn two phases were not oriented in a certain direction. As a result, No. In No. 34, both the flat surface corrosion resistance and the post-painting corrosion resistance were insufficient. Comparative example No. 34 and Example No. Comparing No. 12, 22, and 23, even though their cooling rates are relatively similar, No. No. 34 could not satisfy the scope of the invention because the gas flux was excessive.
- both planar corrosion resistance and sacrificial corrosion resistance are excellent, so industrial applicability is high.
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Abstract
Description
本願は、2022年3月23日に、日本に出願された特願2022-046793号に基づき優先権を主張し、その内容をここに援用する。
[1] 鋼材と、
前記鋼材の表面に配された溶融めっき層と、を備え、
前記溶融めっき層の化学組成が、質量%で、
Al:10.0~30.0%、
Mg:3.0~15.0%、
Fe:0.01~15.0%、
Si:0~10.0%、
Ni:0~1.0%、
Ca:0~4.0%を含有し、
更に、Sb:0~0.5%、Pb:0~0.5%、Cu:0~1.0%、Sn:0~2.0%、Ti:0~1.0%、Cr:0~1.0%、Nb:0~1.0%、Zr:0~1.0%、Mn:0~1.0%、Mo:0~1.0%、Ag:0~1.0%、Li:0~1.0%、La:0~0.5%、Ce:0~0.5%、B:0~0.5%、Y:0~0.5%、P:0~0.5%、Sr:0~0.5%、Co:0~0.5%、Bi:0~0.5%、In:0~0.5%、V:0~0.5%、W:0~0.5%の元素群のうちの1種または2種以上の元素を含有するとともに、これらの元素の合計が5%以下とされ、
残部:Zn及び不純物からなり、
前記溶融めっき層のX線回折測定結果から得られる回折強度が、下記式(1a)および式(2a)の関係を満足する、溶融めっき鋼材。
0.3≦I(002)MgZn2/{I(100)MgZn2+I(101)MgZn2}≦3.0 …(1a)
5.0<I(111)α/I(200)α≦40.0 …(2a)
ただし、式(1a)におけるI(002)MgZn2はMgZn2相の(002)の回折強度であり、I(100)MgZn2はMgZn2相の(100)の回折強度であり、I(101)MgZn2はMgZn2相の(101)の回折強度であり、式(2a)におけるI(111)αはα相の(111)の回折強度であり、I(200)αはα相の(200)の回折強度である。
[2] 鋼材と、
前記鋼材の表面に配された溶融めっき層と、を備え、
前記溶融めっき層の化学組成が、質量%で、
Al:15.0~30.0%、
Mg:5.0~10.0%、
Fe:0.01~15.0%、
Si:0~10.0%、
Ni:0~1.0%、
Ca:0~4.0%を含有し、
更に、Sb:0~0.5%、Pb:0~0.5%、Cu:0~1.0%、Sn:0~2.0%、Ti:0~1.0%、Cr:0~1.0%、Nb:0~1.0%、Zr:0~1.0%、Mn:0~1.0%、Mo:0~1.0%、Ag:0~1.0%、Li:0~1.0%、La:0~0.5%、Ce:0~0.5%、B:0~0.5%、Y:0~0.5%、P:0~0.5%、Sr:0~0.5%、Co:0~0.5%、Bi:0~0.5%、In:0~0.5%、V:0~0.5%、W:0~0.5%の元素群のうちの1種または2種以上の元素を含有するとともに、これらの元素の合計が5%以下とされ、
残部:Zn及び不純物からなり、
前記溶融めっき層のX線回折測定結果から得られる回折強度が、下記式(1b)および式(2b)の関係を満足する、溶融めっき鋼材。
0.6<I(002)MgZn2/{I(100)MgZn2+I(101)MgZn2}≦3.0 …(1b)
5.0<I(111)α/I(200)α≦40.0 …(2b)
ただし、式(1a)におけるI(002)MgZn2はMgZn2相の(002)の回折強度であり、I(100)MgZn2はMgZn2相の(100)の回折強度であり、I(101)MgZn2はMgZn2相の(101)の回折強度であり、式(2b)におけるI(111)αはα相の(111)の回折強度であり、I(200)αはα相の(200)の回折強度である。
[3] 前記溶融めっき層の化学組成のうちのSnが、質量%で、Sn:0.05~0.5%とされ、
前記溶融めっき層のX線回折測定結果によってMg2Sn相が検出される、[1]または[2]に記載の溶融めっき鋼材。
本実施形態の溶融めっき鋼材は、鋼材と、鋼材の表面に配された溶融めっき層と、を備え、溶融めっき層の化学組成が、質量%で、Al:10.0~30.0%、Mg:3.0~15.0%、Fe:0.01~15.0%、Si:0~10.0%、Ni:0~1.0%、Ca:0~4.0%を含有し、更に、Sb:0~0.5%、Pb:0~0.5%、Cu:0~1.0%、Sn:0~2.0%、Ti:0~1.0%、Cr:0~1.0%、Nb:0~1.0%、Zr:0~1.0%、Mn:0~1.0%、Mo:0~1.0%、Ag:0~1.0%、Li:0~1.0%、La:0~0.5%、Ce:0~0.5%、B:0~0.5%、Y:0~0.5%、P:0~0.5%、Sr:0~0.5%、Co:0~0.5%、Bi:0~0.5%、In:0~0.5%、V:0~0.5%、W:0~0.5%の元素群のうちの1種または2種以上の元素を含有するとともに、これらの元素の合計が5%以下とされ、残部:Zn及び不純物からなり、溶融めっき層のX線回折測定結果から得られる回折強度が、下記式(1a)および式(2)の関係を満足する溶融めっき鋼材である。
5.0<I(111)α/I(200)α≦40.0 …(2)
Alは、Znとの固溶体であるα相を形成し、平面部耐食性、塗装後耐食性及び加工性の向上に寄与する。従って、Al濃度は10.0%以上とする。Al濃度を11.0%以上、12.0%以上、又は15.0%以上としてもよい。一方、Alが過剰である場合、Mg濃度およびZn濃度が相対的に低下して、平面部耐食性および塗装後耐食性が劣化する。よって、Al濃度は30.0%以下とする。Al濃度を28.0%以下、25.0%以下、又は20.0%以下としてもよい。
Mgは、平面部耐食性および塗装後耐食性を確保するために必須の元素である。従って、Mg濃度は、3.0%以上とする。Mg濃度を4.0%以上、5.0%以上、又は6.0%以上としてもよい。一方、Mg濃度が過剰であると、加工性、特にパウダリング性が劣化し、更に平面部耐食性および塗装後耐食性が劣化する場合がある。よって、Mg濃度は15.0%以下とする。Mg濃度を12.0%以下、10.0%以下、8.0%以下としてもよい。
Feの濃度は0%でもよい。一方、Feが溶融めっき層に0.01%以上含有されてもよい。Fe濃度が15.0%以下であれば、溶融めっき層の性能に悪影響がないことが確認されている。Fe濃度を例えば0.05%以上、0.10%以上、0.5%以上、又は1.0%以上としてもよい。Fe濃度を例えば10.0%以下、8.0%以下、又は6.0%以下としてもよい。Feは、母材鋼板から混入する場合があるため、Fe濃度は0.05%以上でもよい。
Si濃度は0%であってもよい。一方、Siは、平面部耐食性の向上に寄与する。従って、Si濃度を0.05%以上、0.1%以上、0.2%以上、又は0.5%以上としてもよい。一方、Si濃度が過剰であると、平面部耐食性および塗装後耐食性が劣化する。従って、Si濃度は10.0%以下とする。Si濃度を8.0%以下、7.0%以下、又は6.0%以下としてもよい。
Niの濃度は0%でもよい。一方、Niは平面部耐食性および塗装後耐食性の向上に寄与する。従って、Ni濃度を0.05%以上、0.08%以上、又は0.1%以上としてもよい。一方、Ni濃度が過剰であると、平面部耐食性および塗装後耐食性が劣化する。従って、Ni濃度は、1.0%以下とする。Ni濃度を0.8%以下、0.6%以下、又は0.5%以下としてもよい。
Ca濃度は0%であってもよい。一方、Caは、平面部耐食性を付与するのに最適なMg溶出量を調整することができる元素である。従って、Ca濃度は0.05%以上、0.1%以上、又は0.5%以上であってもよい。一方、Ca濃度が過剰であると、平面部耐食性及び加工性が劣化する。従って、Ca濃度は4.0%以下とする。Ca濃度を3.5%以下、3.0%以下、又は2.8%以下としてもよい。
Sb、Pbの濃度は0%でもよい。一方、Sb、Pbは、塗装後耐食性の向上に寄与する。従って、Sb、Pbそれぞれの濃度を0.05%以上、0.10%以上、又は0.15%以上としてもよい。一方、Sb、Pbの濃度が過剰であると、平面部耐食性が劣化する。従って、Sb、Pbそれぞれの濃度は0.5%以下とする。Sb、Pbそれぞれの濃度を0.4%以下、0.3%以下、又は0.25%以下としてもよい。
Cu、Ti、Cr、Nb、Zr、Mn、Mo、AgおよびLiの濃度はそれぞれ0%でもよい。一方、これらは塗装後耐食性の向上に寄与する。従って、Cu、Ti、Cr、Nb、Zr、Mn、Mo、AgおよびLiそれぞれの濃度を0.05%以上、0.08%以上、又は0.10%以上としてもよい。一方、Cu、Ti、Cr、Nb、Zr、Mn、Mo、AgおよびLiの濃度が過剰であると、平面部耐食性が劣化する。従って、Cu、Ti、Cr、Nb、Zr、Mn、Mo、AgおよびLiそれぞれの濃度は、1.0%以下とする。Cu、Ti、Cr、Nb、Zr、Mn、Mo、AgおよびLiそれぞれの濃度を0.8%以下、0.7%以下、又は0.6%以下としてもよい。
Sn濃度は0%であってもよい。一方、Snは、Mgと金属間化合物を形成し、溶融めっき層の塗装後耐食性を向上させる元素である。従って、Sn濃度を0.05%以上、0.10%以上、0.20%以上、又は0.30%以上としてもよい。ただし、Sn濃度が過剰であると、平面部耐食性が劣化する。従って、Sn濃度は2.0%以下とする。Sn濃度を0.8%以下、0.7%以下、0.6%以下、又は0.5%以下としてもよい。
La、Ce、B、Y、PおよびSrそれぞれの濃度は0%でもよい。一方、La、Ce、B、Y、PおよびSrは、塗装後耐食性の向上に寄与する。従って、La、Ce、B、Y、PおよびSrの濃度それぞれを0.10%以上、0.15%以上、又は0.20%以上としてもよい。一方、La、Ce、B、Y、PおよびSrの濃度が過剰であると、平面部耐食性が劣化する。従って、La、Ce、B、Y、PおよびSrの濃度それぞれを、0.5%以下とする。La、Ce、B、Y、PおよびSrの濃度それぞれを0.4%以下、0.3%以下としてもよい。
Co、Bi、In、V、Wそれぞれの濃度は0%でもよい。一方、Co、Bi、In、V、Wは、塗装後耐食性の向上に寄与する。従って、Co、Bi、In、V、Wの濃度それぞれを0.10%以上、0.15%以上、又は0.20%以上としてもよい。一方、Co、Bi、In、V、Wの濃度が過剰であると、平面部耐食性が劣化する。従って、Co、Bi、In、V、Wの濃度それぞれを、0.5%以下とする。Co、Bi、In、V、Wの濃度それぞれを0.4%以下、0.3%以下としてもよい。
本実施形態に係る溶融めっき層の成分の残部は、Zn及び不純物である。Znは、平面部耐食性及び塗装後耐食性を溶融めっき層にもたらす元素である。不純物は、原材料に含まれる成分、または、製造の工程で混入する成分であって、意図的に含有させたものではない成分を指す。例えば、溶融めっき層には、鋼材とめっき浴との相互の原子拡散によって、不純物として、Fe以外の成分も微量混入することがある。
本実施形態の溶融めっき層では、溶融めっき層のX線回折測定結果から得られるX線回折強度が、下記式(1a)および式(2)の関係を満足する場合に、後述するように、MgZn2相およびα相の結晶方位が一定の方向に配向するようになり、塗装後耐食性および平面部耐食性がともに向上する。
5.0<I(111)α/I(200)α≦40.0 …(2)
AA :腐食減量 40g/m2以上60g/m2未満
A :腐食減量 60g/m2以上80g/m2未満
B :腐食減量 80g/m2以上
シランカップリング剤、タンニン酸、シリカ、及びポリエステル樹脂を混合したクロメートフリー化成処理液をめっき層に塗布し、乾燥することで化成処理膜を形成した。
化成処理膜の上に、下記に記載のプライマー塗料樹脂及びトップコート塗料樹脂を塗布することで、塗膜層を形成した。プライマー塗料樹脂からなる層の厚みは5μmとし、トップコート塗料樹脂からなる層の厚みは15μmとし、合計で20μmとした。
(1)おもて面・裏面のプライマー塗料樹脂
ポリエステル/メラミン+イソシアネート併用硬化型(日本ファインコーティングス社製FLC687塗料樹脂)
(2)おもて面のトップコート塗料樹脂
高分子ポリエステル/メラミン硬化型(日本ファインコーティングス社製FLC7000塗料樹脂)
(3)裏面のトップコート塗料樹脂
ポリエステル/メラミン硬化型(日本ファインコーティングス社製FLC100HQ塗料樹脂)
AA :最大膨れ幅 5mm以上8mm未満
A :最大膨れ幅 8mm以上10mm未満
B :最大膨れ幅 10mm以上
比較例のNo.27では、溶融めっき層のAl量が過剰であった。そのため、No.27では、塗装後耐食性が不足した。
比較例のNo.29では、溶融めっき層のMg量が過剰であった。そのため、No.29では平面部耐食性が不足した。
比較例のNo.31では、溶融めっき層のSn量が過剰であった。そのため、No.31では、平面部耐食性、塗装後耐食性の両方が不足した。
Claims (3)
- 鋼材と、
前記鋼材の表面に配された溶融めっき層と、を備え、
前記溶融めっき層の化学組成が、質量%で、
Al:10.0~30.0%、
Mg:3.0~15.0%、
Fe:0.01~15.0%、
Si:0~10.0%、
Ni:0~1.0%、
Ca:0~4.0%を含有し、
更に、Sb:0~0.5%、Pb:0~0.5%、Cu:0~1.0%、Sn:0~2.0%、Ti:0~1.0%、Cr:0~1.0%、Nb:0~1.0%、Zr:0~1.0%、Mn:0~1.0%、Mo:0~1.0%、Ag:0~1.0%、Li:0~1.0%、La:0~0.5%、Ce:0~0.5%、B:0~0.5%、Y:0~0.5%、P:0~0.5%、Sr:0~0.5%、Co:0~0.5%、Bi:0~0.5%、In:0~0.5%、V:0~0.5%、W:0~0.5%の元素群のうちの1種または2種以上の元素を含有するとともに、これらの元素の合計が5%以下とされ、
残部:Zn及び不純物からなり、
前記溶融めっき層のX線回折測定結果から得られる回折強度が、下記式(1a)および式(2a)の関係を満足する、溶融めっき鋼材。
0.3≦I(002)MgZn2/{I(100)MgZn2+I(101)MgZn2}≦3.0 …(1a)
5.0<I(111)α/I(200)α≦40.0 …(2a)
ただし、式(1a)におけるI(002)MgZn2はMgZn2相の(002)の回折強度であり、I(100)MgZn2はMgZn2相の(100)の回折強度であり、I(101)MgZn2はMgZn2相の(101)の回折強度であり、式(2a)におけるI(111)αはα相の(111)の回折強度であり、I(200)αはα相の(200)の回折強度である。 - 鋼材と、
前記鋼材の表面に配された溶融めっき層と、を備え、
前記溶融めっき層の化学組成が、質量%で、
Al:15.0~30.0%、
Mg:5.0~10.0%、
Fe:0.01~15.0%、
Si:0~10.0%、
Ni:0~1.0%、
Ca:0~4.0%を含有し、
更に、Sb:0~0.5%、Pb:0~0.5%、Cu:0~1.0%、Sn:0~2.0%、Ti:0~1.0%、Cr:0~1.0%、Nb:0~1.0%、Zr:0~1.0%、Mn:0~1.0%、Mo:0~1.0%、Ag:0~1.0%、Li:0~1.0%、La:0~0.5%、Ce:0~0.5%、B:0~0.5%、Y:0~0.5%、P:0~0.5%、Sr:0~0.5%、Co:0~0.5%、Bi:0~0.5%、In:0~0.5%、V:0~0.5%、W:0~0.5%の元素群のうちの1種または2種以上の元素を含有するとともに、これらの元素の合計が5%以下とされ、
残部:Zn及び不純物からなり、
前記溶融めっき層のX線回折測定結果から得られる回折強度が、下記式(1b)および式(2b)の関係を満足する、溶融めっき鋼材。
0.6<I(002)MgZn2/{I(100)MgZn2+I(101)MgZn2}≦3.0 …(1b)
5.0<I(111)α/I(200)α≦40.0 …(2b)
ただし、式(1a)におけるI(002)MgZn2はMgZn2相の(002)の回折強度であり、I(100)MgZn2はMgZn2相の(100)の回折強度であり、I(101)MgZn2はMgZn2相の(101)の回折強度であり、式(2b)におけるI(111)αはα相の(111)の回折強度であり、I(200)αはα相の(200)の回折強度である。 - 前記溶融めっき層の化学組成のうちのSnが、質量%で、Sn:0.05~0.5%とされ、
前記溶融めっき層のX線回折測定結果によってMg2Sn相が検出される、請求項1または請求項2に記載の溶融めっき鋼材。
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- 2023-03-22 TW TW112110752A patent/TWI835607B/zh active
- 2023-03-23 CN CN202380011420.7A patent/CN117255871A/zh active Pending
- 2023-03-23 JP JP2023556494A patent/JP7385167B1/ja active Active
- 2023-03-23 WO PCT/JP2023/011387 patent/WO2023182398A1/ja active Application Filing
- 2023-03-23 KR KR1020237035706A patent/KR102664747B1/ko active IP Right Grant
- 2023-03-23 US US18/285,460 patent/US20240084422A1/en active Pending
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US20240084422A1 (en) | 2024-03-14 |
JP7385167B1 (ja) | 2023-11-22 |
JPWO2023182398A1 (ja) | 2023-09-28 |
TWI835607B (zh) | 2024-03-11 |
CN117255871A (zh) | 2023-12-19 |
EP4299786A8 (en) | 2024-03-20 |
TW202338118A (zh) | 2023-10-01 |
KR102664747B1 (ko) | 2024-05-10 |
KR20230149874A (ko) | 2023-10-27 |
EP4299786A1 (en) | 2024-01-03 |
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