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Surface treated steel plate

A technology for surface treatment of steel plates and steel plates, applied to the device for coating liquid on the surface, plating of superimposed layers, synthetic resin layered products, etc., can solve the problem of unoptimized use of plated steel plates, and achieve high corrosion resistance and anti-blackening effect

Active Publication Date: 2022-07-26
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is not preferable to visually confirm the discoloration of the plated steel sheet from the appearance due to the blackening of such a plating layer.

Method used

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  • Surface treated steel plate
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Experimental program
Comparison scheme
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preparation example Construction

[0088]

[0089] The paint can be prepared by mixing a binder resin such as a polyester resin (for example, molecular weight: 16000, Tg: 10°C) dispersed in a solvent and an imino-type melamine resin at a solid content mass ratio of 100:10 to 100:30, and then adding It is obtained by dispersing predetermined amounts of coloring pigments and antirust pigments in this mixture. In addition, as a solvent, an aqueous solvent (for example, water) is used.

[0090] In the surface-treated steel sheet according to the present invention, as described above, the antirust pigment in the coating film is concentrated on the surface side of the coating film, and the color pigment in the coating film is concentrated on the Zn-based alloy plating layer side. The inventors of the present invention found that the formation of the concentration distribution of such rust preventive pigments and coloring pigments can be realized by utilizing the phenomenon that the imino-type melamine resin is conc...

Embodiment

[0101] The surface-treated steel sheet according to the present invention will be described in more detail below with reference to some examples. However, the scope of the present invention described in the claims is not intended to be limited by the specific examples described below.

[0102]

[0103] (Formation of Zn-based alloy plating layer)

[0104] A cold-rolled steel sheet with a thickness of 1 mm is immersed in a hot-dip coating bath of about 450° C. having a chemical composition of Al: about 11%, Mg: about 3%, and Zn: about 86% for 3 to 5 seconds, and then cold-rolled. A Zn-11%Al-3%Mg alloy plating layer with a thickness of about 10 μm was formed on the steel sheet. In addition, the composition of the dissolution coating bath was changed, and a Zn-1%Al-1%Mg alloy coating layer and a Zn-40%Al-8%Mg alloy coating layer with a thickness of about 10 μm were formed on the cold-rolled steel sheet by the same procedure. Alternatively, a cold-rolled steel sheet having a th...

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Abstract

The present invention relates to a surface-treated steel sheet, which is characterized by comprising a steel sheet, a Zn-based alloy plating layer formed on at least one side of the steel sheet, and a coloring pigment, an anti-rust pigment and a binder formed on the Zn-based alloy plating layer Average thickness T of resin 1 The coating film, the average concentration of the color pigment in the coating film is 5 to 15% by mass, and the surface of the coating film is a width T in the thickness direction of the coating film 2 The average concentration of coloring pigments present in the area C A1 The interface with the Zn-based alloy plating layer side of the self-coating film is the width T in the thickness direction of the coating film 2 The average concentration of coloring pigments present in the area C A2 than C A1 / C A2 is 0.2 to 0.9, T 2 (μm)=0.1×T 1 (μm)+1.1 μm.

Description

technical field [0001] The present invention relates to a surface-treated steel sheet having high corrosion resistance and excellent blackening resistance. Background technique [0002] Coated steel sheets such as galvanized steel sheets that are excellent in corrosion resistance and blackening resistance are widely used for home appliances, building materials, and automobiles. [0003] The surface of various plated steel sheets such as galvanized steel sheets may deteriorate due to the surrounding environment. For example, the plating layer is oxidized by electrolytes such as salt contained in the atmosphere, or by oxygen and moisture existing in a high temperature and high humidity environment, and white rust is generated. When white rust is formed, the appearance uniformity of the plated steel sheet is impaired, and therefore, the plated steel sheet is generally required to have corrosion resistance that suppresses the occurrence of white rust. [0004] In particular, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/00B32B15/08B32B27/18B32B27/20
CPCB32B15/08B32B27/20C23C28/00B32B27/18C23C2/26C23C2/06C23C2/40C09D5/08B05D7/16B05D2202/40
Inventor 柴尾史生平井亚希子东新邦彦河村保明植田浩平
Owner NIPPON STEEL CORP