Etching of aluminum electrolytic capacitor foil

Details Etching of aluminum electrolytic capacitor foil Etching of aluminum electrolytic capacitor foil

1985-02-28

1986-04-22

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

20412975, 252 791, 252 792, 252 794, 29570, 156665, C25D 544

Patent

active

045840679

ABSTRACT:
Aluminum electrolytic capacitor foil is etched by first subjecting high-cubicity foil to a chemical etching stage in which the etchant is an acidic aqueous solution containing an acid having anions for anodizing aluminum, hydrochloric acid, transition metal ions, and aluminum ions. Preferably, the anodizing anions are present in a greater concentration than the chloride ions. The foil is then subjected to a second etching step which may be chemical or electrochemical. The process produces a high capacitance foil with high bend strength.

REFERENCES:
patent: 2154027 (1939-04-01), Brennan
patent: 2171545 (1939-09-01), Edwards et al.
patent: 2180798 (1939-11-01), Collins
patent: 2556626 (1951-06-01), Meulendyke
patent: 2699382 (1955-01-01), Altenpohl

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