Method of producing tin-free steel sheets

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

1983-05-26

1985-05-28

Tung, T.

Chemistry: electrical and wave energy

Processes and products

204 28, 204 41, 204 51, 204 56R, 204 381, 204 383, C25D 500, C25D 548

Patent

active

045198799

ABSTRACT:
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 chromic acid, a chromate or dichromate. The chromium plating and reverse electrolysis should be carried out so as to satisfy the equations:

REFERENCES:
patent: 3421986 (1969-01-01), Ruff et al.
patent: 3928157 (1975-12-01), Suematsu et al.
patent: 3986940 (1976-10-01), Takano et al.
patent: 4145263 (1979-03-01), Tsutsui et al.
patent: 4157944 (1979-06-01), Inui et al.
patent: 4296182 (1981-10-01), Matsubayashi et al.
patent: 4432845 (1984-02-01), Ogata et al.

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