Process for electrolytically coloring aluminum material

Details Process for electrolytically coloring aluminum material Process for electrolytically coloring aluminum material

1987-03-09

1989-02-21

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

204 42, C25D 1122

Patent

active

048062260

ABSTRACT:
A process for electrolytically coloring an aluminum material wherein a base aluminum or aluminum alloy is anodized and the anodized material is electrolyzed in a second electrolytic coloring step using a bath containing nickel and zinc salts, a chelating reagent for nickel ions and a supporting electrolyte at a pH of 4.5 or greater using alternating, direct or dual alternating-direct current electrolytic processes. A molybdate may also be employed in the secondary electrolysis process and the resultant coating has a color ranging from a grey series to black.

REFERENCES:
patent: 4070255 (1978-01-01), Hasegawa
patent: 4659439 (1987-04-01), Watanabe et al.
Abner Brenner, Electrodeposition of Alloys, vol. II, Academic Press, New York, 1963, pp. 194-205.
JIS H 8681 (1980).

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