Surface treated steel plate excellent in corrosion resitance electroconductivity and appearance of coating film

A technology for surface treatment of steel sheets and steel sheets, applied to special surfaces, devices for coating liquid on surfaces, and plating of superimposed layers, etc., can solve the problem of inability to achieve corrosion resistance, inability to obtain antirust effects, and inability to display hexavalent chromium Self-healing effect and other issues

Inactive Publication Date: 2006-08-30
JFE STEEL CORP
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Problems solved by technology

[0010] However, in the chromium-free technologies (1) to (3) above, in terms of potential barrier effect, even without relying on chromium, organic resins can be used to achieve a certain level, but in terms of self-healing effect, since it cannot be developed Self-healing effect of hexavalent chromium, so high corrosion resistance cannot be achieved
[0011] On the other hand, in the technique of (4) above, by adding a specific su

Method used

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  • Surface treated steel plate excellent in corrosion resitance electroconductivity and appearance of coating film

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Embodiment

[0225] In order to form the first film, silica (α) shown in Table 1, phosphoric acid and / or phosphoric acid compound (β) shown in Table 2, phosphoric acid as a metal compound (γ) containing metal components shown in Table 3 Mn, Mg phosphate or Al phosphate, tetravalent vanadium compound (δ) shown in Table 4, etc. were properly mixed with water to prepare a treatment liquid. In addition, in order to form the second film, the antirust additive (B) shown in Table 6 was appropriately blended with the resin (A) shown in Table 5 to prepare a coating composition.

[0226] It should be noted that D-modified resin A' and D-modified resin A" in Table 5 were synthesized by the following method.

[0227] [D modified resin A']

[0228] Put 1870 parts of EP828 (manufactured by Yuka Shieru Epokishi Co., Ltd., epoxy equivalent 187), 912 parts of bisphenol A, 2 parts of tetraethylammonium bromide, and 300 parts of methyl isobutyl ketone into a four-necked flask, and raise the temperature to 1...

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Abstract

PROBLEM TO BE SOLVED: To provide a surface-treated steel sheet having superior corrosion resistance in spite of containing no hexavalent chromium in a coating, and besides, having superior conductivity and coating film appearance.SOLUTION: The surface-treated steel sheet has a composite oxide coating on the surface of a galvanized or aluminized steel sheet, as the first layer, and an organic coating thereon as the second layer. The composite oxide coating includes (α) silica, (β) phosphoric acid and/or a phosphate compound, (γ) one or more metals selected among Mg, Mn and Al and (σ) a tetravalent vanadium compound, each in a predetermined amount. The organic coating includes a reaction product (X) of a film-forming organic resin (A) and an active-hydrogen-containing compound (B) formed of a hydrazine derivative (C), of which one part or all parts have active hydrogen; and a particular corrosion-preventing component (Y).

Description

technical field [0001] The present invention relates to a surface-treated steel sheet most suitable for use in automobiles, home appliances, building materials, and the like. In particular, it relates to an environment-friendly surface-treated steel sheet that does not contain hexavalent chromium that may have adverse effects on operators, users, or the environment when performing wastewater treatment and treatment products during manufacture. Background technique [0002] Among steel sheets for automobiles, steel sheets for home appliances, and steel sheets for building materials, chromate-treated steel sheets provided with a zinc or aluminum plating layer on the surface have been widely used. Chromate treatment is to improve its corrosion resistance (white rust resistance, red rust resistance), and a chromate layer is formed with a treatment solution mainly composed of hexavalent chromium. However, since the chromate treatment uses hexavalent chromium, which is a pollutio...

Claims

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Application Information

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IPC IPC(8): B32B15/08C23C28/00B05D5/12B05D7/14C23C22/07C23C22/42C23C30/00
CPCC23C28/00C23C28/345C23C28/3225C23C28/322
Inventor 松田武士松崎晃冈井和久
Owner JFE STEEL CORP
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