AC Etching of aluminum capacitor foil

Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge

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20412995, C25F 304

Patent

active

043766862

ABSTRACT:
Aluminum capacitor foil is etched using AC current and an etchant bath comprising 0.8 to 1.5 M hydrochloric acid, 0.4 to 0.5 M aluminum chloride, 0.04 to 0.3 M nitric acid, and 0.05 to 0.2 M tartaric acid. The frequency of the alternating current is 12 to 20 Hz, and the bath temperature is 30.degree. to 40.degree. C.

REFERENCES:
patent: 4276129 (1981-06-01), Kanzaki et al.
patent: 4319972 (1982-03-01), Bernis
patent: 4332652 (1982-06-01), Arora

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