Stock material or miscellaneous articles – All metal or with adjacent metals – Foil or filament smaller than 6 mils
Patent
1994-12-28
1998-02-03
Zimmerman, John J.
Stock material or miscellaneous articles
All metal or with adjacent metals
Foil or filament smaller than 6 mils
428687, 420542, 361305, C22C 2106, H01G 9045, H01G 9055
Patent
active
057142718
ABSTRACT:
A raw aluminum foil for use to prepare electrolytic condenser electrodes has an aluminum purity of 99.9% or higher and contains 50-500 ppm of Mg. A method of etching the raw foil to prepare the electrodes consists of a primary etching step and a secondary etching step, and the primary etching is conducted in an aqueous bath containing 3-10% by weight of HCl and 10-40% by weight of H.sub.2 SO.sub.4, at 70.degree.-90.degree. C. and with a current density of 10-40 A/dm.sup.2. The secondary etching is conducted electrolytically or chemically in a further bath containing 3-10% by weight of HCl, with or without 1% or less of H.sub.2 C.sub.2 O.sub.4 added to the further bath, at a bath temperature of 70.degree.-95.degree. C. and with a current density of 0-10 A/dm.sup.2.
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Endo Shigeru
Fujihira Tadao
Isoyama Eizo
Tsukuda Ichizo
Yamanoi Tomoaki
Showa Aluminum Corporation
Zimmerman John J.
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