Electrolysis: processes – compositions used therein – and methods – Product produced by electrolysis involving electrolytic...
Patent
1991-06-11
1992-09-01
Niebling, John
Electrolysis: processes, compositions used therein, and methods
Product produced by electrolysis involving electrolytic...
205153, 205175, 205213, 205332, C25D 1104
Patent
active
051435918
ABSTRACT:
The invention relates to a method of producing aluminum capacitor foil adapted for use in high voltage AC motor start capacitors. Aluminum foil is electrolytically etched in a hot aqueous solution of sodium cloride and then immersed in a hot solution of nitric acid. The foil is immediately thereafter passivated in a dilute aqueous solution of phosphoric acid. The passivated foil is electrolytically treated at a first voltage of at least 150 but not greater than 250 volts in a solution of an ammonium salt of a phosphate, a silicate or a vanadinate to substantially reduce the leakage current, and further electrolytically treated at a second voltage of a magnitude about twice that of the first voltage in a solution of an ammonium salt of an aliphatic dicarboxylic acid of at least 9 carbon atoms and ammonium phosphate until an essentailly amorphous oxide is formed on the foil.
REFERENCES:
patent: 2052571 (1936-09-01), Karnes
patent: 4437955 (1984-03-01), Shaffer
patent: 4481084 (1984-11-01), Chen et al.
Leader William T.
Niebling John
Spain Norman N.
U.S. Philips Corporation
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