Two step electro chemical and chemical etch process for high vol

Details Two step electro chemical and chemical etch process for high vol Two step electro chemical and chemical etch process for high vol

1984-07-16

1985-06-25

Tufariello, Thomas

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

C25F 304

Patent

active

045252491

ABSTRACT:
Aluminum electrolytic capacitor anode foil of a high cubic texture etched in 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 and at a temperature of 75.degree. C., and in a second step treating said etched foil in an aqueous bath of 8% nitric acid and 2.6% aluminum as a nitrate at a temperature of 85.degree. C. for 5 to 7 minutes. 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.

REFERENCES:
patent: 4213835 (1980-07-01), Fickelscher
patent: 4332652 (1982-06-01), Arora
patent: 4420367 (1983-12-01), Focher
patent: 4468295 (1984-08-01), Pliefke
Electronic Components and Applications, vol. 5, No. 4, Sep. 1983, pp. 246-253.

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