Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1994-03-16
1995-08-08
Valentine, Donald R.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
20412975, 20412995, C25F 304
Patent
active
054395658
ABSTRACT:
For this invention it is disclosed that aluminium electrode foil is caused to pass through any of nitric acid, sulfuric acid and mixed acid thereof each added with at least one selected from the group consisting of chromic acid, oxalic acid, citric acid, phosphoric acid, boric acid, succinic acid and malonic acid as an additive and electrically etched in the etching process of a final stage for increasing the diameter of pits created in a preceding stage for etching to a diameter suitable for a forming voltage, and any of the nitric acid, sulfuric acid and mixed acid thereof controls the concentration of dissolved aluminium to 5 to 25 g/l, whereby aluminium is dissolved along the inner wall of the pits while the surface dissolution of the aluminium electrode foil is suppressed, so that the diameter of the pits can be effectively increased.
REFERENCES:
patent: 4276129 (1981-06-01), Kanzaki et al.
patent: 4547275 (1985-10-01), Ejima et al.
patent: 5186795 (1993-02-01), Hall
Patent Abstracts of Japan, vol. 15, No. 304 (E-1096) 5 Aug. 1991 & JP-A-03 108 710 (ELNA CO LTD) 8 May 1991.
Patent Abstracts of Japan, vol. 14, No. 244 (E-0932) 24 May 1990 & JP-A-02 066 925 (Matsushita Electric Ind Co) 7 Mar. 1990.
Kojima Kouichi
Sonoda Tetsuo
Suzuki Katsunori
Torii Takeshi
Matsushita Electric - Industrial Co., Ltd.
Valentine Donald R.
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