AC Etching of aluminum capacitor foil

Details AC Etching of aluminum capacitor foil AC Etching of aluminum capacitor foil

1981-07-06

1982-06-01

Tufariello, T.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

2041299, C25F 304

Patent

active

043326528

ABSTRACT:
Aluminum electrolytic capacitor foil is etched in a bath containing 0.5 to 1.8 M hydrochloric acid, 0.2 to 0.5 M aluminum chloride, 0.03 to 0.3 M phosphoric acid, and 0.05 to 0.3 M nitric acid, the molar ratio of said nitric acid to said phosphoric acid being 0.3-5, while subjected to the action of alternating current at 28.degree. to 45.degree. C.

REFERENCES:
patent: 2166990 (1939-07-01), Gray
patent: 4072589 (1978-02-01), Golda
patent: 4087341 (1978-05-01), Takahashi
patent: 4276129 (1981-06-01), Kanzaki et al.
patent: 4279714 (1981-07-01), Arora et al.

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