Method of treating a surface of an aluminum or aluminum alloy

Details Method of treating a surface of an aluminum or aluminum alloy Method of treating a surface of an aluminum or aluminum alloy

1978-04-12

1980-09-09

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 35N, 204 42, 204 58, C25D 1106, C25D 1108, C25D 1110, C25D 1122

Patent

active

042216400

ABSTRACT:
An aluminum or aluminum alloy is electrolyzed in an electrolytic bath composed of an aqueous solution containing at least one of hydroxides and salts of alkali or alkaline earth metal and further optionally including at least one substance capable of forming barrier-type layer selected from the group consisting of inorganic acids, organic acids and ammonium salts of weak acids by applying an alternating current to form a grain-like or wooden like pattern on the surface thereof. The thus obtained grain-like pattern may be directly subjected to usual coloration treatments or may be anodically oxidized prior to the usual coloration treatment.

REFERENCES:
patent: 1515658 (1924-11-01), Cole
patent: 1735286 (1929-11-01), Kujirai et al.
patent: 1735509 (1929-11-01), Setoh et al.
"Surface Treatment of Al," Wernick et al., 1964, pp. 252-253.
"Electrolytic Alkaline Cleaning," The Surface Treatment & Finishing of Al by S. Wernick et al., 3rd ed., 1964, pp. 171-173, 192.

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