Process for electrolytically coloring aluminum and aluminum allo

Details Process for electrolytically coloring aluminum and aluminum allo Process for electrolytically coloring aluminum and aluminum allo

1976-03-03

1978-01-24

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204 35N, C25D 1122

Patent

active

040702553

ABSTRACT:
Aluminum or aluminum alloy is first anodized to form an oxide film thereon. With the pores in this oxide film unsealed, the basis metal is then electrolyzed by use of alternating current at a preselected starting voltage, and this voltage is lowered at least once before completion of the electrolytic coloring of the basis metal. The electrolytic solution in which the electrolysis is effected contains either at least three metallic salts or at least two metallic salts and a strong reducing compound.

REFERENCES:
patent: 3773631 (1973-11-01), Immel et al.
patent: 3912602 (1975-10-01), Zweifel et al.
patent: 3929593 (1975-12-01), Sugiyama et al.
patent: 3977948 (1976-08-01), Martinez

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