Process for anodizing aluminum foil

Details Process for anodizing aluminum foil Process for anodizing aluminum foil

1983-08-31

1984-03-20

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 38A, 204 42, 204 58, C25C 1108, C25C 1112, C25C 1116

Patent

active

044379455

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 and stabilization of the foil in alkaline borax baths, the foil is electrochemically anodized in an aqueous solution of monosodium phosphate having a pH of 3.5 to 5.0 as electrolyte. The anodization is interrupted for stabilization of the foil by passing it through a bath containing a borax solution having a pH of 8.5 to 9.5 at a temperature of above 80.degree. C., and then reanodizing the foil. The process is useful in anodizing foil to a voltage of up to 550 V.

REFERENCES:
patent: 1012889 (1911-12-01), Mershon
patent: 1068410 (1913-07-01), Chubb
patent: 1658976 (1928-02-01), Edelman
patent: 2076904 (1937-04-01), Lilienfeld
patent: 2116449 (1938-05-01), Robinson
patent: 4252575 (1981-02-01), Bernard

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