EP4582579A1 - Plated steel material and method for manufacturing plated steel material - Google Patents

Plated steel material and method for manufacturing plated steel material Download PDF

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Publication number
EP4582579A1
EP4582579A1 EP22957477.7A EP22957477A EP4582579A1 EP 4582579 A1 EP4582579 A1 EP 4582579A1 EP 22957477 A EP22957477 A EP 22957477A EP 4582579 A1 EP4582579 A1 EP 4582579A1
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EP
European Patent Office
Prior art keywords
less
comparative example
layer
coating layer
alloy layer
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EP22957477.7A
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German (de)
English (en)
French (fr)
Other versions
EP4582579A4 (en
Inventor
Mamoru Saito
Yasuto Goto
Hidetoshi Shindo
Naoyuki YAMATO
Yuto FUKUDA
Takuya Miyata
Yasuhiro Majima
Kohei Tokuda
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Nippon Steel Corp
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Nippon Steel Corp
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Publication of EP4582579A4 publication Critical patent/EP4582579A4/en
Publication of EP4582579A1 publication Critical patent/EP4582579A1/en
Pending legal-status Critical Current

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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
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • 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
    • C22C18/00—Alloys based on zinc
    • C22C18/04—Alloys based on zinc with aluminium as the next major constituent
    • 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
    • C23C2/04—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
    • 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
    • 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
    • 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

Definitions

  • the present disclosure relates to a coated steel material and a method for manufacturing a coated steel material.
  • the first high corrosion resistant coated steel material for construction materials was a Zn-5% Al coated steel material (Galfan coated steel material), in which Al was added to a Zn-based coating layer to improve the corrosion resistance. It is a well-known fact that the corrosion resistance is improved by addition of Al into a coating layer, and by addition of 5% of Al, Al phase are formed in the coating layer (specifically Zn phase) and the corrosion resistance is improved.
  • a Zn-55% Al-1.6% Si coated steel material (Galvalume steel product) is also a coated steel material, in which corrosion resistance is basically improved for the same reason.
  • the attractive feature of a Zn-based coated steel material is the sacrificial corrosion protection effect on a base steel.
  • a cracked portion of a coating layer generated at the time of forming, and an exposed portion of a base steel which appears, for example, by exfoliation of a coating layer the coating layer in the vicinity of such portions dissolves out before corrosion of the base steel, and the dissolved coating component forms a protective film. This makes it possible to prevent rusting in the base steel to some extent.
  • Patent Literature 1 As such a coated steel material containing a certain amount of Al and Mg, for example, a coated steel material disclosed in Patent Literature 1 has been also developed.
  • Patent Literature 1 discloses "a hot dip Zn-Al-Mg-Si coated steel material in which 200 or more Al phases exist per 1 mm 2 on the surface of a coated steel material having a coating layer composed of from 5% to 18% by mass of Al, from 1% to 10% by mass of Mg, from 0.01% to 2% by mass of Si, and the balance of Zn and unavoidable impurities".
  • Patent Literature 2 discloses "a coated steel material including a steel product, and a coating layer including a Zn-Al-Mg alloy layer provided on a surface of the steel product, in which the coatcoating layer has a chemical composition composed of Zn at more than 65.0%, Al at more than 5.0% and less than 25.0%, Mg at more than 3.0% and less than 12.5%, and Sn at from 0.1% to 20.0%, and in a backscattered electron image of the Zn-Al-Mg alloy layer, obtained by polishing a surface of the Zn-Al-Mg alloy layer to 1/2 of a layer thickness, and observing the surface at a magnification of 100 x with a scanning electron microscope, Al phase are present, and an average value of a cumulative circumferential length of the Al phase is from 88 to 195 mm/mm 2 ".
  • an object of the disclosure is to provide a coated steel material which is excellent in corrosion resistance even in a heavy salt damage region and can achieve both formability and discoloration resistance, and a method for manufacturing the coated steel material.
  • the disclosure it is possible to provide a coated steel material which is excellent in corrosion resistance even in a heavy salt damage region and can achieve both formability and discoloration resistance, and a method for manufacturing the coated steel material.
  • Fig. 1 is a graph for explaining a method for measuring a thickness of a Mg enrichment layer.
  • a numerical range expressed using “to” means a range including the numerical values stated before and after “to” as the upper limit and lower limit.
  • the numerical range means a range not including the numerical value as the upper limit or lower limit.
  • a coated steel material according to the disclosure includes a base steel and a coating layer including a Zn-Al-Mg alloy layer provided on a surface of the base steel and a Mg enrichment layer provided on a surface of the Zn-Al-Mg alloy layer.
  • a thickness of the Mg enrichment layer is 0.8 ⁇ m or more and (thickness of coating layer ⁇ 1/2) or less.
  • Mg ions and Al ions are supplied to the corrosion environment from the middle to the late stage of corrosion while securing formability. Accordingly, a dense corrosion product film is maintained, and therefore corrosion resistance is improved.
  • coated steel material of the disclosure will be described in detail below.
  • the base steel there is no particular restriction on the shape of the base steel.
  • the base steel include besides a steel sheet, shape formed base steel, such as a steel pipe, a civil engineering and building material (such as fence conduit, corrugated pipe, drain ditch cover, wind-blown sand preventing coate, bolt, wire mesh, guardrail, and cut-off wall), a home electrical appliance component (such as housing for an air conditioner outdoor unit), and an automobile part (such as a suspension system component).
  • shape forming for example, various plastic working methods, such as press working, roll forming, and bending, can be used.
  • a hot-rolled steel sheet, a hot-rolled steel strip, a cold rolled steel sheet, and a cold rolled steel strip described in JIS G 3302 (2010) are also applicable.
  • the base steel may be a precoated steel material which has been precoated.
  • a precoated steel material is obtained, for example, by an electrolytic treatment method or a displacement coating method.
  • electrolytic treatment method a base steel is immersed in a sulfate bath or chloride bath containing various metal ions corresponding to precoating components, and an electrolytic treatment is performed to obtain a precoated steel material.
  • displacement coating method a base steel is immersed in an aqueous solution, which contains various metal ions corresponding to precoating components, and of which a pH has been adjusted with sulfuric acid, for causing displacement deposition of a metal to obtain a precoated steel material.
  • the coating layer includes a Zn-Al-Mg alloy layer and a Mg enrichment layer provided on a surface of the Zn-Al-Mg alloy layer.
  • the coating layer may include an Al-Fe alloy layer in addition to the Zn-Al-Mg alloy layer and the Mg enrichment layer.
  • the Al-Fe alloy layer is provided between the base steel and the Zn-Al-Mg alloy layer.
  • the coating layer may have a laminated structure including the Zn-Al-Mg alloy layer, the Mg enrichment layer, and the Al-Fe alloy layer.
  • an oxide film of a constituent element of the coating layer is formed on the surface of the coating layer in a thickness of about 50 nm, a thickness thereof is thin relative to the thickness of the entire coating layer (about from 8 to 60 ⁇ m) such that the oxide film is deemed not to constitute a main part of the coating layer.
  • a deposited amount of the coating layer is preferably from 40 to 300 g/m 2 per one surface.
  • the deposited amount of the coating layer is 40 g/m 2 or more, corrosion resistance can be ensured more reliably. Also, when the deposited amount of the coating layer is 300 g/m 2 or less, appearance defects such as sagging patterns of the coating layer can be suppressed.
  • the chemical composition of the coating layer is a chemical composition composed of, in terms of % by mass:
  • Sn, Bi, In, Ca, Y, La, Ce, Si, Cr, Ti, Zr, Mo, W, Ag, P, Ni, Co, V, Nb, Cu, Mn, Li, Na, K, Fe, Sr, Sb, Pb, and B are optional components. In other words, these elements need not be contained in the coating layer. When any of these optional components is contained, the content of each optional element is preferably in the range described below.
  • the Zn concentration is set above 65.00%.
  • the Zn concentration is preferably 70.00% or more.
  • the upper limit of the Zn concentration is a remnant concentration excluding elements other than Zn, and impurities.
  • the upper limit of the Mg concentration is set at lower than 12.50% (preferably at 10.00% or less).
  • the lower limit of the Sn concentration is preferably more than 0.00% (preferably 0.05% or more, and more preferably 0.10% or more).
  • the upper limit of the Sn concentration is set at 3.00% or less.
  • the lower limit of the Bi concentration is preferably more than 0.00% (preferably 0.10% or more, and more preferably 3.00% or more).
  • the upper limit of the Bi concentration is set below 5.00% (preferably at 4.80% or less).
  • the upper limit of the In concentration is set below 2.00% (preferably at 1.80% or less).
  • Sr, Sb, Pb, and B are elements that contribute to corrosion resistance. Therefore, the lower limit of the concentration of each of Sr, Sb, Pb, and B is preferably more than 0% (preferably 0.05% or more, and more preferably 0.10% or more).
  • the chemical components of a coating layer are measured by the following method.
  • an acid solution in which a coating layer is separated and dissolved with an acid containing an inhibitor that inhibits the corrosion of a base steel is prepared.
  • the chemical composition of the coating layer can be obtained by measuring the obtained acid solution by ICP analysis.
  • the acid species insofar as it is an acid capable of dissolving the coating layer.
  • the chemical composition is measured as an average chemical composition.
  • Ni precoated steel material when a Ni precoated steel material is used, not only Ni in the coating layer but also Ni in the Ni precoating is detected in the ICP analysis. Specifically, for example, when a precoated steel material having a Ni deposited amount of from 1 g/m 2 to 3 g/m 2 (thickness of about 0.1 to 0.3 ⁇ m) is used as a base steel, even if the concentration of Ni contained in the coating layer is 0%, the Ni concentration is detected as from 0.1% to 15% when measured by the ICP analysis.
  • the vicinity of the interface between the coating layer and the base steel in the steel product is linearly analyzed by an electron probe microanalyzer (FE-EPMA) on the measurement surface of the sample to measure the Ni concentration.
  • the measurement conditions are an acceleration voltage of 15 kV, a beam diameter of about 100 nm, irradiation time per point of 1000 ms, and a measurement pitch of 60 nm.
  • a measurement distance may be any distance insofar as it is possible to confirm whether or not the Ni concentration is concentrated at the interface between a coating layer and a base steel in a steel product.
  • the base steel is discriminated as a Ni precoated steel material.
  • the Ni concentration of the coating layer is defined as a value measured as follows.
  • the emission intensity of Ni is measured for three or more kinds of standard samples (Zn alloy standard samples IMN ZH1, ZH2, and ZH4 manufactured by BAS) having different Ni concentrations.
  • a calibration curve is prepared from the relationship between the obtained emission intensity of Ni and the Ni concentration in the standard test.
  • the Zn concentration of the coating layer is defined as a Zn concentration calculated from the following formula.
  • Zn concentration 100 - (Concentration of elements other than Zn and Ni determined by ICP analysis + Ni concentration determined by GDS)
  • Measurement conditions of the high frequency glow discharge emission surface analyzer are as follows.
  • a total area ratio of Al phase, MgZn 2 phase, and Zn/Al/MgZn 2 ternary eutectics is 90% or more.
  • the area ratio of the structure excluding the Al phase, the MgZn 2 phase, and the Zn/Al/MgZn 2 ternary eutectics, as that of Zn phase is preferably from 0% to 10%, more preferably from 0% to 8% or from 0% to 5%, and still more preferably from 0% to 2%.
  • the area ratio of Zn phase is particularly preferably 0% (that is, it is particularly preferable not to contain Zn phase.).
  • the structure of the Zn-Al-Mg alloy layer is measured as follows.
  • the surface of the coating layer of the sample is polished in the thickness direction of the coating layer (hereinafter also referred to as "Z-axis direction").
  • the surface of the coating layer is dry-polished with a #1200 abrasive sheet, and then finish-polishing is carried out successively using a finishing liquid containing alumina having an average particle diameter of 3 ⁇ m, a finishing liquid containing alumina having an average particle diameter of 1 ⁇ m, and a finishing liquid containing colloidal silica in the mentioned order.
  • the Zn intensity in the surface of the coating layer is measured by XRF (X-ray fluorescence analysis) before and after the polishing, and when the Zn intensity after the polishing reduces to 1/2 the Zn intensity before the polishing, the then thickness of the coating layer is deemed as the 1/2 layer thickness. Since the Zn-Al-Mg alloy layer occupies 1/2 or more of the layer thickness of the coating layer, the polished surface obtained by polishing the surface of the coating layer to 1/2 of the layer thickness is the polished surface of the Zn-Al-Mg alloy layer. Therefore, the metal structure contained in the Zn-Al-Mg alloy layer can be grasped by analyzing the polished surface.
  • XRF X-ray fluorescence analysis
  • SEM backscattered electron image a backscattered electron image (hereinafter also referred to as "SEM backscattered electron image”).
  • the SEM observation conditions are: acceleration voltage at 15 kV, probe-current at 10 nA, and visual field size of 244 ⁇ m ⁇ 198 ⁇ m.
  • FE-EPMA line analysis is performed at a magnification of 2000 x for a length of 10 ⁇ m.
  • a region in which Mg or Al is detected by 1% or more can be discriminated as Zn/Al/MgZn 2 ternary eutectics, and a region in which both Mg and Al are detected by less than 1% can be discriminated as Zn phase.
  • the thickness of the coating layer is preferably 5 ⁇ m or more and 50 ⁇ m or less, and more preferably 10 ⁇ m or more and 45 ⁇ m or less.
  • the surface roughness Ra of the skin pass roll is measured as follows. Roughness is measured at three positions on the surface of the skin pass roll in the width direction of the roll with a stylus-type portable roughness meter, and an average value thereof is obtained.
  • a film may be formed on the coating layer of a coated steel material of this disclosure.
  • the film may be constituted with a single layer, or two or more layers.
  • Examples of the kind of the film directly on the coating layer include a chromate film, a phosphate film, and a chromate-free film.
  • a chromate treatment, a phosphate treatment, or a chromate-free treatment for forming the film may be performed by a known method.
  • the chromate treatment includes an electrolytic chromate treatment, by which a chromate film is formed by electrolysis; a reactive chromate treatment, by which a film is formed utilizing a reaction with a material, and then an excess treatment solution is washed out; and a painting type chromate treatment, by which a treatment solution is applied to an object, and then dried without washing with water to form a film. Any treatment may be adopted.
  • Examples of the electrolytic chromate treatment include those using chromic acid, silica sol, a resin (such as an acrylic resin, a vinyl ester resin, a vinyl acetate/acrylic emulsion, a carboxylated styrene butadiene latex, a diisopropanolamine-modified epoxy resin), or hard silica.
  • a resin such as an acrylic resin, a vinyl ester resin, a vinyl acetate/acrylic emulsion, a carboxylated styrene butadiene latex, a diisopropanolamine-modified epoxy resin
  • hard silica such as an acrylic resin, a vinyl ester resin, a vinyl acetate/acrylic emulsion, a carboxylated styrene butadiene latex, a diisopropanolamine-modified epoxy resin
  • Examples of the phosphate treatment include a zinc phosphate treatment, a zinc calcium phosphate treatment, and a manganese phosphate treatment.
  • the chromate-free treatment is particularly preferable because it does not impose a burden on an environment.
  • the chromate-free treatment includes an electrolytic chromate-free treatment, by which a chromate-free film is formed by electrolysis; a reactive chromate-free treatment, by which a film is formed utilizing a reaction with a material, and then an excess treatment solution is washed out; and a painting type chromate-free treatment, by which a treatment solution is applied to an object, and then dried without washing with water to form a film. Any treatment may be adopted.
  • an organic resin one kind, or a mixture of two or more kinds of (unmodified) organic resins may be used; or one kind, or a mixture of two or more kinds of organic resins obtained by modifying at least one kind of organic resin in the presence of at least one kind of another organic resin may be used.
  • the organic resin film may contain an optional color pigment or rust preventive pigment.
  • a water-based form prepared through dissolution or dispersion in water may also be used.
  • a general hot-rolled steel sheet (C concentration ⁇ 0.1%) having a sheet thickness of 2.3 mm was used. After a surface to be coated of the base steel was brush-polished, degreasing and pickling were performed immediately before a coating step.
  • a Ni precoated steel material prepared by applying Ni precoating to general hot-rolled steel sheet having a sheet thickness of 2.3 mm was used as the base steel.
  • the deposited amount of Ni was set at from 1 g/m 2 to 3 g/m 2 .
  • a remark of "Ni precoated” was entered in the column of "Base steel” in the Tables.
  • a contact type K thermocouple was attached to a back surface of the surface to be coated of the base steel in order to monitor the temperature of the steel product in a coated steel sheet preparing process.
  • the same reduction treatment method was applied to the base steel up to a step of immersion in the hot-dip coating bath.
  • the base steel was heated from room temperature to 800°C by electric heating in a N 2 -H 2 (5%) environment (dew point of -40°C or less, oxygen concentration of less than 25 ppm), retained there for 60 sec, cooled to the hot-dip coating bath temperature +10°C by N 2 gas blow, and then immediately immersed in the hot-dip coating bath.
  • the immersion time in the hot-dip coating bath was set to the time in the table.
  • the N 2 gas wiping pressure was adjusted and a coated steel sheet was prepared such that a coating thickness was 30 ⁇ m ( ⁇ 1 ⁇ m).
  • the hot-dip coating bath temperature was 500°C.
  • the immersion time in the hot-dip coating bath was 2 seconds.
  • the base steel was pulled up from the hot-dip coating bath, and then subjected to a cooling process under the conditions set forth in Table 1 or 2 with respect to the following average cooling rates at the first to third stages as itemized in Table 1 or 2 to obtain a coating layer.
  • a sample was cut out from an obtained coated steel sheet.
  • the following items were measured according to the method described above.
  • a sample was cut out from an obtained coated steel sheet. Then, the samples were placed vertically, and 21 cycles of a combined cycle corrosion test (CCT) in accordance with the corrosion acceleration test (JASO M609-91) were conducted. After performing the corrosion test, the case where the corrosion loss was 20 g/m 2 or less was evaluated as "A”, and the case where the corrosion loss was more than 20 g/m 2 was evaluated as "NG”.
  • CCT combined cycle corrosion test
  • a sample was cut out from an obtained coated steel sheet. After bending the sample by 1 T, tape was exfoliated from the processed portion, and an area ratio of the coating layer attached to the tape was evaluated. An area ratio of the deposited coating layer of 5% or less was evaluated as "A”, and an area ratio of more than 5% was evaluated as "NG”.
  • a sample was cut out from an obtained coated steel sheet. Then, the sample was placed at an angle of 60° with respect to the horizontal direction on a constant temperature and humidity tester (KCL-2000 manufactured by EYELA) at 50°C and 80%RH, and a color difference ⁇ E after 3 days was evaluated. With respect to the color difference, before and after the test, the L value, a* value, and b* value of the sample in a SCE (specular light removal) method were measured with a colorimeter (CR-400 manufactured by Konica Minolta Optics), and the color difference ⁇ E was investigated at 4 points to determine an average value thereof.
  • KCL-2000 constant temperature and humidity tester
  • Examples corresponding to a coated steel material of the disclosure exhibit more excellent corrosion resistance as compared to Comparative Examples, even in a coastal region in which the amount of airborne chlorides is large and the corrosion environment is severe. In addition, it can also be seen that formability and discoloration resistance are excellent.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
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  • Oil, Petroleum & Natural Gas (AREA)
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  • Coating With Molten Metal (AREA)
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  • Application Of Or Painting With Fluid Materials (AREA)
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EP22957477.7A 2022-08-31 2022-12-16 Plated steel material and method for manufacturing plated steel material Pending EP4582579A1 (en)

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JP2022138732 2022-08-31
PCT/JP2022/046531 WO2024047883A1 (ja) 2022-08-31 2022-12-16 めっき鋼材及びめっき鋼材の製造方法

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EP4582579A4 EP4582579A4 (en) 2025-07-09
EP4582579A1 true EP4582579A1 (en) 2025-07-09

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KR20250047371A (ko) 2025-04-03
CL2025000465A1 (es) 2025-06-23
CN119731364A (zh) 2025-03-28
AU2022476549A1 (en) 2025-02-27
US20260071311A1 (en) 2026-03-12
MX2025002194A (es) 2025-04-02
CO2025002746A2 (es) 2025-03-27
EP4582579A4 (en) 2025-07-09
TW202411439A (zh) 2024-03-16
JPWO2024047883A1 (https=) 2024-03-07
JOP20250047A1 (ar) 2025-02-25
WO2024047883A1 (ja) 2024-03-07
TWI821086B (zh) 2023-11-01

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