Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Coating predominantly single metal or alloy substrate of...
Patent
1994-03-16
1995-09-12
Valentine, Donald R.
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Coating predominantly single metal or alloy substrate of...
205188, 205213, 2041291, 204140, C25D 1104, C25D 1116
Patent
active
054494486
ABSTRACT:
This invention includes a first step for dipping etched aluminium foil into pure water of high temperature for a predetermined period of time, a second step for dipping the aluminium foil into an aqueous solution containing an organic acid and at least one kind of a salt thereof after the first step, and a third step for subjecting the aluminium foil to a forming treatment in an electrolytic solution after the second step, wherein either straight saturated dicarboxylic acid having an odd number of carbons or trans-straight unsaturated dicarboxylic acid is used or organic acid having an aromatic ring and a carboxyl group is used as the organic acid in the second step, whereby leakage current characteristics are improved by weakening a dissolving action to a hydrated film and strengthening a bonding action to the hydrated film.
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patent: 5064511 (1991-11-01), Gobbetti
patent: 5143591 (1992-09-01), Shaffer
Database WPI, Section CH, Week 8521, Derwent Publications Ltd., London, GB; Class L03, AN 85-126417 & JP-A-60 065 517 (Matsushita Elec Ind KK) 15 Apr. 1985.
Patent Abstracts of Japan, vol. 16, No. 521 (E-1285) 27 Oct. 1992 & JP-A-04 196 304 (Elna Co Ltd) 16 Jul. 1992.
Patent Abstracts of Japan, vol. 14, No. 51 (E-1001) 14 Nov. 1990 & JP-A-02 216 811 (Elna Co Ltd) 29 Aug. 1990.
Kojima Kouichi
Kurihara Naomi
Okamura Kazuo
Sonoda Tetsuo
Yoshimura Yoshihito
Matsushita Electric - Industrial Co., Ltd.
Valentine Donald R.
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