Method of forming oxide coatings

Details Method of forming oxide coatings Method of forming oxide coatings

1981-06-10

1983-07-12

Douglas, Winston A.

Chemistry: electrical and wave energy

Processes and products

204 35N, 204 56R, C25D 550, C25B 102

Patent

active

043929206

ABSTRACT:
This invention is concerned with an improved plating process for covering a substrate with a black metal oxide film. The invention is particularly directed to making a heating panel for a solar collector.
A compound is electrodeposited from an aqueous solution containing cobalt metal salts onto a metal substrate. This compound is converted during plating into a black, highly absorbing oxide coating which contains hydrated oxides. This is achieved by the inclusion of an oxidizing agent in the plating bath.
The inclusion of an oxidizing agent in the plating bath is contrary to standard electroplating practice. The hydrated oxides are converted to oxides by treatment in a hot bath, such as boiling water. An oxidizing agent may be added to the hot liquid treating bath.

REFERENCES:
patent: 3723261 (1973-03-01), Byers
patent: 4029541 (1977-06-01), Barlow et al.
patent: 4055707 (1977-10-01), McDonald
patent: 4104134 (1978-08-01), Roberts et al.
patent: 4145263 (1979-03-01), Tsutsui et al.
F. A. Lowenheim, Electroplating, McGraw-Hill Book Co., New York, 1978, pp. 463-464.

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