Single step electro chemical etch process for high volt aluminum

Details Single step electro chemical etch process for high volt aluminum Single step electro chemical etch process for high volt aluminum

1983-12-20

1984-10-02

Tufariello, Thomas

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

C25F 304

Patent

active

044746571

ABSTRACT:
Aluminum electrolytic capacitor foil of a high cubic texture etched by passing the foil through an electrolyte bath containing 3% hydrochloric acid and 1% aluminum as aluminum chloride under the influence of a direct current and at a temperature of 75.degree. C. The foil thus etched has a significantly higher capacitance resulting from a greater density of tunnels, an elongation of the tunnels, and a fairly linear tunnel structure in the foil.

REFERENCES:
patent: 2209712 (1940-07-01), Brennan
patent: 3284326 (1966-11-01), Martin
patent: 4332652 (1982-06-01), Arora

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