Method of producing tin-free steel sheets having improved...

Details Method of producing tin-free steel sheets having improved... Method of producing tin-free steel sheets having improved...

C - Chemistry, Metallurgy

25

D

204/25.5

C25D 5/14 (2006.01) C25D 11/38 (2006.01)

Patent

CA 1226240

ABSTRACT OF THE DISCLOSURE Tin-free steel sheets exhibiting improved retorting resistance with respect to paint adhesion are produced by chromium plating a steel sheet through cathodic electrolysis in a chromium ion-containing solution, reversely electrolyzing the sheet by a successive anodizing treatment in said solution, and subjecting the sheet to an electrolytic treatment in an aqueous chromate solution. The SO?- concentration of the chromate solution used in the electrolytic chromates treatment should be limited to the range of 0.01 to 0.10 gram per liter of the solution.

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