Method for etching electrode foils for an aluminium electrolytic

Details Method for etching electrode foils for an aluminium electrolytic Method for etching electrode foils for an aluminium electrolytic

1985-12-27

1987-07-21

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412943, 204DIG9, C25F 304

Patent

active

046816720

ABSTRACT:
A method for electrolytically etching an aluminium foil for use as an electrode of an aluminium electrolytic capacitor is described. In the method, an aluminium foil is electrolytically etched an on the surfaces thereof in a 3 to 25% hydrochloric acid solution containing aluminium chloride by application of an AC current. The AC current has a waveform, each cycle of which consists of positive and negative half cycles and an OFF time interval between the respective half cycles at which the AC current becomes zero whereby the size of pits formed by the etching is suitably controlled.

REFERENCES:
patent: 3294666 (1966-12-01), Wiersma
patent: 4294672 (1981-10-01), Ohba et al.
patent: 4297184 (1981-10-01), Dyer
patent: 4315806 (1982-02-01), Arora
patent: 4533444 (1985-08-01), Oda et al.
patent: 4545875 (1985-10-01), Riley

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