Chemistry: electrical and wave energy – Processes and products
Patent
1981-03-23
1983-11-08
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
204 42, 204DIG9, C25D 1122
Patent
active
044140770
ABSTRACT:
The invention comprises an improved method for producing anodized aluminum articles colored by means of optical interference effects. The method comprises the steps of subjecting an aluminum article that has been anodized by conventional process to a treatment for modifying the pore structure of the anodic film, thereafter subjecting it while connected as anode to an electrolytic treatment for modifying the barrier layer between the oxide and the metal substrate and finally coloring the article while connected as cathode in an electrolyic bath containing one or more dissolved metal salts using DC current on which is superimposed a train of positive current pulses.
REFERENCES:
patent: 4021315 (1977-05-01), Yanagida et al.
patent: 4066816 (1978-01-01), Sheasby et al.
patent: 4128460 (1978-12-01), Nishimura et al.
patent: 4226680 (1980-10-01), Cooke et al.
patent: 4316780 (1982-02-01), Yoshida et al.
Kajiyama Takashi
Miyashita Teruo
Oka Yasuo
Yoshida Kohichi
Daniel William J.
Kaplan G. L.
Leader William
Nippon Light Metal Company Limited
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