Hot-dip zn-alloy-plated steel sheet

A hot-dip plating, steel plate technology, applied in hot-dip plating process, superimposed layer plating, metal material coating process and other directions, can solve the problems of blackening on the surface of the coating, damage to the appearance, etc., and achieve the effect of high productivity

Active Publication Date: 2016-07-20
NISSHIN STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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Embodiment Construction

[0047] (Hot dip Zn alloy plated steel sheet of the present invention)

[0048] The hot-dip Zn alloy-plated steel sheet of the present invention has a base steel sheet, 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.

[0049] 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, a steel sheet for deep drawing made of low-carbon Ti-added steel, low-carbon Nb-added steel, or the like is preferably used as the base steel sheet. In addition, high-strength steel sheets to which P, Si, Mn, etc. are added can also be used.

[0050] The hot-dip Zn alloy layer is disposed on the surface of the base steel sheet. The compos...

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Abstract

This hot-dip Zn-alloy-plated steel sheet comprises: a steel sheet; a hot-dip Zn-alloy-plated layer arranged on a surface of the steel sheet; and a complex oxide coating film arranged on a surface of the hot-dip Zn-alloy-plated layer. The complex oxide coating film includes vanadium and a constituent component of the hot-dip Zn-alloy-plated layer, and the entire surface of the coating film satisfies the following formula (1): S[Hydroxide] / (S[Hydroxide]+S[Oxide]) 100 <= 40. In formula (1): S[Oxide] is the area exhibited by a peak having a center at approximately 1022 eV ascribable to a Zn oxide in an intensity profile in XPS analysis of the surface of the complex oxide coating film; and S[Hydroxide] is the area exhibited by a peak having a center at approximately 1023 eV ascribable to a Zn hydroxide in an intensity profile in XPS analysis of the surface of the complex oxide coating 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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Application Information

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Patent Type & Authority Applications(China)
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
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