Process for anodizing aluminum foil

Details Process for anodizing aluminum foil Process for anodizing aluminum foil

1983-08-31

1984-11-06

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 28, 204 29, 204 42, 204 58, C25D 1116, C25D 1108

Patent

active

044810830

ABSTRACT:
In an integrated process for the anodization of aluminum foil for electrolytic capacitors including the formation of a hydrous oxide layer on the foil prior to anodization and stabilization of the foil in alkaline borax baths during anodization, the foil is electrochemically anodized in an aqueous solution of boric acid and 2 to 50 ppm phosphate having a pH of 4.0 to 6.0. The anodization is interrupted for stabilization by passing the foil through a bath containing the borax solution having a pH of 8.5 to 9.5 and a temperature above 80.degree. C. and then reanodizing the foil. The process is useful in anodizing foil to a voltage of up to 760 V.

REFERENCES:
patent: 1012889 (1910-01-01), Mershon
patent: 2122392 (1938-06-01), Robinson et al.
patent: 2151806 (1939-03-01), Schnoll et al.
patent: 4113579 (1978-09-01), Randall et al.

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