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

C - Chemistry, Metallurgy

25

D

204/24.4

C25D 11/38 (2006.01) B32B 15/18 (2006.01) C23C 28/00 (2006.01)

Patent

CA 1311711

28 ABSTRACT OF THE DISCLOSURE 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 Cr3+ oxide layer, and an outermost surface layer of SiO2 and Cr3+ oxide plus Cr6+ 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.

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