Manufacturing method of hot-dip Zn alloy steel plate
A kind of technology of alloy steel plate and manufacturing method, which is applied in the field of hot-dip Zn alloy steel plate, can solve the problems of coating surface blackening, damage to appearance, etc., and achieve the effect of high productivity
Active Publication Date: 2018-08-24
NISSHIN STEEL CO LTD
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Problems solved by technology
[0004] However, the hot-dip Zn alloy-plated steel sheet produced in this way may blacken over time on the surface of the coating.
The appearance of the hot-dip Zn alloy-plated steel sheet that has become blackened has lost its metallic luster and turned dark gray, which is detrimental to the appearance. Therefore, a method of suppressing blackening has been sought.
Method used
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[0048] (Hot dip Zn alloy plated steel sheet of the present invention)
[0049] The hot-dip Zn alloy plated steel sheet of the present invention has a base steel plate, a hot-dip Zn alloy plated layer, and a composite oxide film. The hot-dipped Zn alloy-plated steel sheet of the present invention has a predetermined composite oxide film, so it is excellent in blackening resistance.
[0050] The kind of base steel sheet is not particularly limited. For example, a steel plate made of low-carbon steel, medium-carbon steel, high-carbon steel, alloy steel, or the like can be used as the base steel plate. When good press formability is required, it is preferable to use a steel sheet for deep drawing made of low-carbon Ti-added steel, low-carbon Nb-added steel, or the like as the base steel sheet. In addition, high-strength steel sheets to which P, Si, Mn, etc. are added can also be used.
[0051]The hot-dip Zn alloy layer is disposed on the surface of the base steel sheet. The co...
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Abstract
The hot-dip Zn alloy-plated steel sheet of the present invention includes a steel sheet; a hot-dip Zn alloy-plated layer disposed on the surface of the steel sheet; and a composite oxide film disposed on the surface of the hot-dip Zn alloy layer. The composite oxide film contains the constituent components of the hot-dip Zn alloy layer and vanadium, and satisfies the following formula (1) over the entire surface. In the formula (1), S[Oxide] is the area represented by the peak centered at about 1022 eV of the oxide derived from Zn in the intensity distribution of the XPS analysis of the surface of the composite oxide film. S[Hydroxide] is the area represented by the peak centered at about 1023 eV of the hydroxide derived from Zn in the intensity distribution of the XPS analysis of the surface of the composite oxide film.
Description
technical field [0001] The present invention relates to a hot-dip Zn alloy plated steel sheet excellent in blackening resistance. Background technique [0002] As a plated steel sheet excellent in corrosion resistance, a hot-dip Zn alloy-plated steel sheet obtained by forming a hot-dip Zn alloy-plated layer containing Al and Mg on the surface of a base steel sheet is known. As the composition of the coating layer of a hot-dip Zn alloy plated steel sheet, for example, it contains Al: 4.0-15.0 mass%, Mg: 1.0-4.0 mass%, Ti: 0.002-0.1 mass%, B: 0.001-0.045 mass%, and the remainder: Zn and unavoidable impurities. The hot-dip Zn alloy steel plate has a composition in [Al / Zn / Zn 2 The ternary eutectic structure of Mg] is mixed with the metal structure of [primary crystal Al] and [Zn single phase] in the blank, and it has sufficient corrosion resistance and surface appearance as an industrial product. [0003] The aforementioned hot-dip Zn alloy plated steel sheet can be continuou...
Claims
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IPC IPC(8): C23C28/00C22C18/00C22C18/04C23C2/06
CPCC22C18/00C22C18/04C23C2/06C23C2/26C23C2/40C23C28/00C23C2/29C23C2/20
Inventor 清水厚雄松野雅典山本雅也武津博文
Owner NISSHIN STEEL CO LTD