Chromate-treated zinc-plated steel strip and method for making

Details Chromate-treated zinc-plated steel strip and method for making Chromate-treated zinc-plated steel strip and method for making

1987-02-26

1989-02-14

Rutledge, L. Dewayne

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428629, 428633, 428659, 428666, B32B 1504

Patent

active

048045870

ABSTRACT:
A chromate-treated steel strip comprising a chromate film on a zinc plated steel strip is improved in corrosion resistance and coating adherence by forming the chromate film of three layer structure consisting of a metallic Cr layer, a Cr.sup.3+ oxide layer, and an outermost surface layer of SiO.sub.2 and Cr.sup.3+ oxide plus Cr.sup.6+ oxide plus Cr.sup.6+ oxide. The three layered chromate film is deposited on a zinc plated steel strip by effecting cathodic electrolysis in a bath containing hexavalent chromium, colloidal silica, optional alumina sol, and a fluoride, by supplying electricity at a specific current density to a controlled quantity.

REFERENCES:
patent: 4137132 (1979-01-01), Ward et al.
patent: 4437944 (1984-03-01), Bruno et al.
patent: 4548868 (1985-10-01), Yonezawa et al.
patent: 4659394 (1987-04-01), Hara et al.

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