Coated steel sheet, works, panels for thin televisions and process for production of coated steel sheet

A technology for coating steel plates and steel plates, applied in the direction of metal material coating process, coating, layered products, etc., can solve the problems of unoptimized environment, no consideration, and insufficient stamping workability.

Active Publication Date: 2009-03-25
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The coated steel sheets described in Patent Documents 1 and 2 all assume the use of a chromate-based coating containing chromium as a chemical conversion coating, which is not preferable in terms of the environment, and the polyester resin is not designed as a thin coating, that is, it can withstand The coating film has the strength of the stress at the time of pressing such as drawing, so sufficient press workability cannot be obtained
Moreover, for example, when used as a panel for a thin TV, the inner surface of the coated steel sheet that becomes the inner surface of the panel after stamping must have conductivity from the necessity of welding, electromagnetic shielding, etc. These are not considered at all

Method used

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  • Coated steel sheet, works, panels for thin televisions and process for production of coated steel sheet
  • Coated steel sheet, works, panels for thin televisions and process for production of coated steel sheet
  • Coated steel sheet, works, panels for thin televisions and process for production of coated steel sheet

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Embodiment

[0088] Examples of the present invention will be described.

[0089] As galvanized steel sheets for coating, electro-galvanized steel sheets (coating type code: EG) with a thickness of 0.5 mm, alloyed hot-dip galvanized steel sheets (Fe content: 10% by mass, coating type code: GA), and hot-dip galvanized steel sheets (coating type code: GA) with a thickness of 0.5 mm were prepared. Galvanized steel sheet (coating type code: GI), hot-dip Zn-Al steel sheet (Al content: 4.5% by mass, coating type code: GF) and black electroplated zinc-nickel alloy steel sheet (Ni content: 12% by mass, coating Species designation: EZNB). The coating adhesion amount of the coated steel sheet is shown in Table 1. In addition, the deposition amount and composition of the plating layer on one surface (outer surface) and the other surface (inner surface) of the steel sheet were made the same. After degreasing the prepared coated steel sheet, the following processes (i) to (iv) were performed to produ...

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Abstract

A coated steel sheet which is excellent in bending properties, press working properties, tight adhesion of coating film after working, solvent resistance, chemical resistance, stain resistance, weather resistance, electrical conductivity and corrosion resistance and which has excellent surface appearance and satisfactory hardness of coating film, more specifically, a steel sheet which is characterized in that the both sides of the sheet are each covered with a zinc plating layer and a chromium-free chemical conversion coating formed successively and the chemical conversion coating on either of the sides of the sheet is further covered with a single coating film comprising both a polyester resin cured with a crosslinking agent and resin particles having a mean particle diameter of 3 to 40[mu]m, a glass transition temperature of 70 to 200 DEG C and a hardness higher than that of the polyester resin.

Description

technical field [0001] The present invention relates to a coating in which a zinc-based coating and a chromium-free chemical conversion coating are sequentially formed on both surfaces of a steel sheet, and a thin coating is formed on the chemical conversion coating on one surface of the steel sheet. A laminated steel sheet, a processed product, a panel for a thin television, and a method for manufacturing a coated steel sheet. The coated steel sheet of the present invention can be used, for example, as a raw material for panels for thin televisions, household electric appliances such as refrigerators and fan heaters, building materials, and automobile parts. Background technique [0002] Generally, in precoated steel sheets, modified polyester resins or epoxy resins are mainly used for the primer on the outer surface, thereby ensuring adhesion to the base steel sheet, corrosion resistance, and the like. In addition, polyester-based, acrylic-based paints, etc. are used for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/09B05D7/14B05D7/24C09D5/00C09D7/12C09D163/00C09D167/00C09D175/06C23C28/00
CPCC23C2/26B05D2202/15C23C28/00C09D167/00C09D167/07B05D7/52C09D175/06C09D5/084B05D3/0254B05D7/51C23C22/08Y10T428/12569C23C28/3225
Inventor 尾形浩行多田千代子西山直树藤林亘江
Owner JFE STEEL CORP
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