Process for manufacturing electrolytically chromated steel sheet

Details Process for manufacturing electrolytically chromated steel sheet Process for manufacturing electrolytically chromated steel sheet

1975-12-31

1976-10-19

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 56R, C25D 1138

Patent

active

039869407

ABSTRACT:
In a conventional electrolytic chromating bath, a steel sheet is subjected to a cathodic electrolytic chromate treatment at a relatively high speed of 400 to 1,000m per minute, to form simultaneously a lower layer of metallic chromium and an upper layer of hydrated chromium oxides on the surface of said steel sheet; and then, said electrolytically chromated steel sheet is subjected to an anodic electrolytic treatment under the following conditions in said electrolytic chromating bath, to adjust the amount of said hydrated chromium oxide layer within the range from 0.1 to 0.3mg/dm.sup.2 :

REFERENCES:
patent: 3679554 (1972-07-01), Yamagishi et al.
patent: 3772165 (1973-11-01), Yamagishi et al.

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