Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1985-01-28
1985-10-15
Tufariello, T. M.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
2041299, 20412995, C25F 304
Patent
active
045472750
ABSTRACT:
A process for treating the surface of aluminum foil for use as an electrode of electrolytic capacitors to increase the surface area of the foil to the greatest possible extent includes the three steps of pre-etching treatment, intermediate nitric acid treatment and post-etching treatment. The pre-etching treatment is conducted electrolytically in an aqueous solution of chromic acid and at least one of chromic acid and chromates. The intermediate nitric acid treatment is carried out by immersing the pre-etched foil in an aqueous solution of nitric acid to remove a chromate film formed by the pre-etching from the foil surface, especially from the interior of the resulting pits. The post-etching treatment is conducted electrolytically in an aqueous solution of hydrochloric acid, or hydrochloric acid and an oxidizing acid.
REFERENCES:
patent: 3477929 (1969-11-01), Namikata
patent: 3887447 (1975-06-01), Sheasby
patent: 4140599 (1979-02-01), Yamasaki
patent: 4432846 (1984-02-01), Honeycutt
Arai Kozo
Ejima Tatsuhiko
Fujihira Tadao
Isoyama Eizo
Showa Aluminum Kabushiki Kaisha
Tufariello T. M.
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