Anodization of aluminum electrolyte capacitor foil

Details Anodization of aluminum electrolyte capacitor foil Anodization of aluminum electrolyte capacitor foil

1984-04-16

1984-11-06

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 28, 204 58, C25D 1112

Patent

active

044810849

ABSTRACT:
In order to increase the crystalline oxide content of barrier layer oxide and hence its capacitance, aluminum electrolytic capacitor foil is anodized at an average current density of at most 3 mA/cm.sup.2 of effective surface area in an aqueous electrolyte of C.sub.4 to C.sub.7 unsubstituted aliphatic dicarboxylic acid containing 0 to 0.05 wt. % of citric acid or tartaric acid and preferably at a temperature above 70.degree. C. The anodized foil is subjected to a relaxation and reanodization treatment to stabilize the foil. The anodization at low current density promotes high crystalline oxide content of the barrier layer oxide, and the relaxation and reanodization insure a stable barrier layer oxide of increased capacitance.

REFERENCES:
patent: 4113579 (1978-09-01), Randall et al.
patent: 4437945 (1984-03-01), Sells et al.
patent: 4437946 (1984-03-01), Bernard

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