Treating etched aluminum electrolytic capacitor foil

Details Treating etched aluminum electrolytic capacitor foil Treating etched aluminum electrolytic capacitor foil

1979-05-02

1980-05-27

Mack, John H.

Chemistry: electrical and wave energy

Processes and products

204 33, 204 38A, 148 627, C25D 1116

Patent

active

042049199

ABSTRACT:
Aluminum electrolytic capacitor foil is treated prior to anodization in a two-step process in which a hydrous oxide film is first formed on the foil and the hydrous oxide is then modified. In the first step the foil is immersed in boiling water to form an appropriate thickness of hydrous oxide and in the second step it is immersed in a boiling aqueous solution containing phosphate, silicate, or tartrate ions, or combinations thereof. This treatment results in a decreased power consumption during anodization and produces a film having higher film capacitance.

REFERENCES:
patent: Re18833 (1933-05-01), Clark
patent: Re28015 (1974-05-01), Vermilyea et al.
patent: 1946153 (1934-02-01), Edwards
patent: 2126954 (1938-08-01), Edwards
patent: 2396685 (1946-03-01), Coggins
patent: 2853445 (1958-09-01), Catotti et al.
patent: 2859148 (1958-11-01), Altenpohl
patent: 2981647 (1961-04-01), Schwartz
patent: 4113579 (1978-09-01), Randall, Jr. et al.

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