Two step electrochemical etch process for high volt aluminum ano

Details Two step electrochemical etch process for high volt aluminum ano Two step electrochemical etch process for high volt aluminum ano

1984-08-29

1985-05-21

Tufariello, Thomas

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412975, C25F 304

Patent

active

045184712

ABSTRACT:
Aluminum electrolytic capacitor anode foil of a high cubic texture is etched using a two step process by treating the foil in an electrolyte bath containing 3% hydrochloric acid and 1% aluminum as aluminum chloride under the influence of a direct current of high current density and at a temperature of 75.degree. C., and in a second step treating said etched foil in a similar bath with a much lower current density and at a temperature of 80.degree. to 82.5.degree. C. The foil thus etched has a significantly higher capacitance resulting from a greater density of tunnels, and a fairly linear tunnel structure.

REFERENCES:
patent: 4213835 (1980-07-01), Fickelscher
patent: 4420367 (1983-12-01), Tocher

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