Combined AC and DC etching of aluminum foil

Details Combined AC and DC etching of aluminum foil Combined AC and DC etching of aluminum foil

1983-07-05

1984-03-20

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412975, 20412995, 204DIG8, C25F 304

Patent

active

044379552

ABSTRACT:
Aluminum foil exhibiting a good combination of capacitance and mechanical strength is produced by an etching procedure that includes the steps of AC pre-etching aluminum foil in an acid bath containing hydrochloric acid and then, without removing the hydrochloric acid from the foil, etching the foil with a high density DC while the foil is immersed in an aqueous solution of sodium chloride and sodium sulfate.

REFERENCES:
patent: 3779877 (1973-12-01), Alwitt
patent: 3935080 (1976-01-01), Gumbinner et al.
patent: 4297184 (1981-10-01), Dyer
patent: 4374710 (1983-02-01), Walls

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