Process for producing an aluminum electrolytic capacitor having

Details Process for producing an aluminum electrolytic capacitor having Process for producing an aluminum electrolytic capacitor having

1977-04-28

1978-09-12

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 38A, 204 58, 204 42, C25D 1112, C25D 544

Patent

active

041135792

ABSTRACT:
An electrolytic capacitor is provided with an electrode having a stable aluminum oxide dielectric by anodizing an aluminum foil in a process that includes depolarizing the foil in a bath containing a hydration inhibitor selected from tartrate or citrate or phosphate anions.

REFERENCES:
patent: 2396685 (1946-03-01), Coggins
patent: 3733291 (1973-05-01), Alwitt
"Al. Foil in Electroly. Capacitors", N. F. Jackson, BAFRA H-Book, Aston Univ. Symp., 50-64 (1974).
" Elec. Instab. of Composite Al. Oxide Films", R. S. Alwitt et al., 27th Intern. Soc. Electrochem. Mfg., Zurich (9/76).
"Effect of Prep. Conds. of Anodic Oxide Film Growth Process" by Zudova et al., Electrokhimiya, 1975, 11(8), 1239-1243, C.A. 84:81457p, 1976.
"The React. Bet. Anodic Al Oxide & H.sub.2 O", Bernard et al., J. E.C.S., 108:822-825, (1961).

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