Etching of aluminum capacitor foil

Details Etching of aluminum capacitor foil Etching of aluminum capacitor foil

1985-04-19

1986-05-13

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412975, C25F 304

Patent

active

045884862

ABSTRACT:
Aluminum capacitor foil is etched by passing it through a bath of electrolyte under the influence of pulsed direct current. The pulse duration is at least nine times as long as the interval between pulses when the current falls to zero and is preferably 3 to 27 milliseconds. The pulse current density is 2 to 10 A/in.sup.2, etching temperature is 50.degree. to 90.degree. C., and the electrolyte is an aqueous solution containing sodium chloride and sodium sulfate.

REFERENCES:
patent: 3085950 (1963-04-01), Thomas et al.
patent: 3284326 (1966-11-01), Martin
patent: 3520788 (1970-07-01), Paehr
patent: 4484252 (1984-11-01), Ruijgrok

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