Method for electrolytic coloring of aluminim or aluminum alloys

Details Method for electrolytic coloring of aluminim or aluminum alloys Method for electrolytic coloring of aluminim or aluminum alloys

1987-03-23

1989-02-28

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

204 42, 204 58, C25D 1122

Patent

active

048082805

ABSTRACT:
A method for electrolytic coloring of anodized aluminum or aluminum alloys in an electrolyte containing metal salts is disclosed, in which the aluminum or aluminum alloy is preliminarily treated in an electrolyte by applying a voltage of substantially positive voltage wave form and, thereafter, the electrolytic coloring is carried out in the same electrolyte by applying an asymmetrical alternating current voltage that the positive voltage is smaller than the negative voltage.

REFERENCES:
patent: 3704209 (1972-11-01), Patrie
patent: 4042468 (1977-08-01), Hasegawa et al.
patent: 4147598 (1979-04-01), Shigeta et al.
patent: 4316780 (1982-02-01), Yoshida et al.
patent: 4632735 (1986-12-01), Santa-Olalla et al.

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