Method of producing tin-free steel sheets

Details Method of producing tin-free steel sheets Method of producing tin-free steel sheets

C - Chemistry, Metallurgy

25

D

204/25.5

C25D 11/12 (2006.01) C25D 11/38 (2006.01)

Patent

CA 1223543

ABSTRACT OF THE DISCLOSURE Tin-free steel sheets having improved resistance to retorting treatment are produced by chromium plating a steel sheet through cathodic electrolysis in a chromium ion- containing aqueous solution to form a metallic chromium coating, reversely electrolyzing the chromium plated steel sheet by a successive anodizing treatment in the same solution, and subjecting the sheet to an electrolytic chromate treatment in another aqueous solution of chronic acid, a chromates or dichromate. The chromium plating and reverse electrolysis should be carried out so as to satisfy the equations: x + 1 ? y ? x + 4 1 ? x ? 6 where y and x are the quantities of hydrated chromium oxides formed on one surface of the steel sheet after the chromium plating step and after the reverse electrolysis step, respectively, as expressed in mg (in terms of metallic chromium) per square meters of the surface.

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