Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Coating predominantly single metal or alloy substrate of...
Patent
1990-11-21
1992-01-07
Niebling, John F.
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Coating predominantly single metal or alloy substrate of...
205174, 205199, C25D 1118
Patent
active
050788450
ABSTRACT:
A process for preparing an electrode foil for use in aluminum electrolytic capacitors is disclosed which comprises the steps of: subjecting an aluminum base foil to a first anodic treatment in an aqueous solution of oxalic acid or sulfuric acid; subjecting the base foil so treated to a second anodic treatment in an aqueous solution of boric acid or adipic acid; and immersing the base foil so treated into an aqueous solution containing phosphoric acid or a salt thereof. Also disclosed is an electrode foil prepared by this process, which comprises an aluminum base foil, an anodic oxide film disposed on the base foil, and a porous oxide film disposed on the anodic oxide film, wherein phosphate ions are adsorbed on the surface of the porous oxide film.
REFERENCES:
patent: 3920525 (1975-11-01), Fromson
patent: 4113579 (1978-09-01), Randall, Jr. et al.
patent: 4481084 (1984-11-01), Chen et al.
patent: 4537665 (1985-08-01), Nguyen et al.
Kanzaki Nobuyoshi
Kunugihara Hiromu
Shimatani Ryoichi
Takahashi Hiroshi
Leader William T.
Matsushita Electric - Industrial Co., Ltd.
Niebling John F.
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