Method for manufacturing electrolytically chromated steel sheet

Details Method for manufacturing electrolytically chromated steel sheet Method for manufacturing electrolytically chromated steel sheet

1989-02-10

1990-02-06

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204 29, 204 41, 204 561, C25D 910

Patent

active

048986496

ABSTRACT:
A method for manufacturing an electrolytically chromated steel sheet, comprising the steps of: subjecting a steel sheet intermittently to a plurality of runs of cathodic electrolytic chromate treatment in an acidic electrolytic chromating solution. At least one of these plurality of runs of cathodic electrolytic chromate treatment is carried out at a high electric current density within the range of from 90 to 200 A/dm.sup.2, to form on at least one surface of the steel sheet a chromating film comprising a metallic chromium layer as a lower layer having numerous granular projections over the entire surface thereof, and a hydrated chromium oxide layer as an upper layer. The electrolytically chromated steel sheet manufactured in accordance with the method of the present invention is excellent in a secondary paint adhesion and a weldability, and has a satisfactory surface hue.

REFERENCES:
patent: 3316160 (1967-04-01), Uchida et al.
patent: 3642587 (1972-02-01), Allen et al.
patent: 4547268 (1985-10-01), Bruno et al.
patent: 4608130 (1986-08-01), Shimizu et al.
patent: 4687713 (1987-08-01), Ogata et al.
H. E. Haring et al., "Electrodeposition of Chromium from Chromic Acid Baths", Bureau of Standard, No. 346, pp. 436-437, (1927).
Metal Surface Technology, a journal of the Metal Finishing Society of Japan, vol. 35, No. 7, pp. 34-38, issued on Jul. 1, 1984.

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