Method for forming colorless or colored pattern having shade dif

Details Method for forming colorless or colored pattern having shade dif Method for forming colorless or colored pattern having shade dif

1976-06-11

1978-01-03

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

204 18R, 204 58, C25D 1104, C25D 1112, C25D 1114, C25D 1122

Patent

active

040665160

ABSTRACT:
Colored pattern having shade difference on an aluminum or aluminum alloy article is formed by anodically oxidizing said article in a conventional manner, and applying the anodically oxidized aluminum or aluminum alloy article to a voltage 5-190 V higher than the voltage applied in the anodic oxidation at a portion corresponding to the pattern in an electrolytic bath to increase thickness of barrier layer and then coloring the thus treated article in a solution containing a metal salt.

REFERENCES:
patent: 2085988 (1937-07-01), McNally
patent: 2540602 (1951-02-01), Thomas et al.
patent: 3284321 (1966-11-01), Fromson
patent: 3450606 (1969-06-01), Darrow
patent: 3532607 (1970-10-01), Roberts
patent: 3839163 (1974-10-01), Kaneda

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