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Hot-dip zn-alloy-plated steel sheet and method for producing same

A technology of hot-dip plating and steel plate, applied in the direction of hot-dip plating process, chemical instruments and methods, liquid chemical plating, etc., can solve the problems of blackening of the coating surface, damage to the appearance, etc., and achieve the effect of high productivity

Active Publication Date: 2016-10-05
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 hot-dip Zn alloy plated steel sheet with blackening intensified loses its metallic luster and becomes dark gray, which is detrimental to the appearance, so a method of suppressing blackening has been sought

Method used

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  • Hot-dip zn-alloy-plated steel sheet and method for producing same
  • Hot-dip zn-alloy-plated steel sheet and method for producing same
  • Hot-dip zn-alloy-plated steel sheet and method for producing same

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Embodiment Construction

[0056](Manufacturing method of hot-dip Zn alloy plated steel sheet of the present invention)

[0057] The method for producing a hot-dip Zn alloy-plated steel sheet (hereinafter also referred to as "plated steel sheet") of the present invention has the following steps: (1) forming a hot-dip Zn alloy-plated layer (hereinafter also referred to as "plated layer") on the surface of a base steel sheet and (2) a second step of cooling the base steel sheet and the coating layer heated by the formation of the coating layer by bringing a predetermined aqueous solution into contact with the surface of the coating layer.

[0058] One of the characteristics of the production method of the present invention is that, after forming the hot-dipped Zn alloy layer, a predetermined cooling water solution is brought into contact with the surface of the plating layer to suppress blackening of the plating layer. Hereinafter, each step will be described.

[0059] (1) The first process

[0060] In ...

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Abstract

This hot-dip Zn-alloy-plated steel sheet comprises: a steel sheet; and a hot-dip Zn-alloy-plated layer arranged on a surface of the steel sheet. The entire surface of the hot-dip Zn-alloy-plated layer satisfies the following formula (1): S[Zn(OH)2] / (S[Zn(OH)2]+S[Zn]) * 100 <= 40. In formula (1): S[Zn] is the area exhibited by a peak having a center at approximately 1022 eV ascribable to metallic Zn in an intensity profile in XPS analysis of the surface of the hot-dip Zn-alloy-plated layer; and S[Zn(OH)2] is the area exhibited by a peak having a center at approximately 1023 eV ascribable to Zn(OH)2 in an intensity profile in XPS analysis of the surface of the hot-dip Zn-alloy-plated layer.

Description

technical field [0001] The present invention relates to a hot-dip Zn alloy plated steel sheet excellent in blackening resistance and a manufacturing method thereof. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C22C18/00C22C18/04C23C2/26C23F11/06
CPCC22C18/00C22C18/04C23C22/361C23C22/78C23C2/06B32B15/013C22C21/10C23C2/40C23C2/29C23C2/26C23C18/48C23C22/62C23C2/12C23F11/06
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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