Method of producing tin-free steel sheets having improved resist

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

1983-07-14

1984-02-21

Demers, Arthur P.

Chemistry: electrical and wave energy

Processes and products

204 35R, 204 38A, C25D 502, C25D 1138

Patent

active

044328451

ABSTRACT:
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.sub.4.sup.-- concentration of the chromate solution used in the electrolytic chromate treatment should be limited to the range of 0.01 to 0.10 gram per liter of the solution.

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