AC Etching of aluminum capacitor foil

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

1982-09-24

1984-01-24

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412975, 2041299, 20412995, C25F 300, C25F 500

Patent

active

044275064

ABSTRACT:
In the AC etching of aluminum foil in a hydrochloric acid electrolyte containing at least one additive, the presence of 200 to 500 ppm sulfate permits etching thicker foil for higher voltage use than is possible without the sulfate. The additive is chosen from phosphoric, nitric, and tartaric acids or salts. The presence of the relatively small amount of sulfate yields a foil with higher capacitance and generally allows lower temperatures and frequencies to be used.

REFERENCES:
patent: 3284326 (1966-11-01), Martin
patent: 3321389 (1967-05-01), Anderson
patent: 3728237 (1973-04-01), Heijenbrok
patent: 3887447 (1975-06-01), Sheasby et al.
patent: 4052275 (1977-10-01), Gumbinner et al.
patent: 4276129 (1981-06-01), Kanzaki et al.
patent: 4297184 (1981-10-01), Dyer
patent: 4332652 (1982-06-01), Arora et al.
patent: 4376686 (1983-03-01), Arora

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