Aluminum foil as electrolytic condenser electrodes

Details Aluminum foil as electrolytic condenser electrodes Aluminum foil as electrolytic condenser electrodes

1994-09-12

1996-05-21

Nguyen, Ngoo-yen

Stock material or miscellaneous articles

All metal or with adjacent metals

Having composition, density, or hardness gradient

428629, 428606, 428654, 361529, H01G 904, C22C 2100

Patent

active

055188230

ABSTRACT:
An aluminum foil to be etched for use as the electrolytic condenser electrodes is composed of a foil body of an aluminum purity of 99.9% or higher, and an oxide layer 20-70 .ANG. thick and formed due to contact of the foil body with an oxidizing atmosphere. At least one etching nuclei-forming element is concentrated in a boundary region and/or in an outermost surface region of the oxide layer, the boundary region being disposed between the foil body and the oxide layer, and both the regions having a thickness of 20 .ANG. or less. The ratio in ion intensity of a maximum concentration of the elements in these regions to a concentration of the elements in the inner layer of the foil body is 1.2-30. There are three patterns in distribution of the elements, so that the maximum concentration is in a predetermined ratio to the concentration in the surface region, the inner layer or a minimum concentration appearing between the regions. The foil will be etched to be ready for use as the electrolytic condenser electrodes.

REFERENCES:
patent: 3997339 (1976-12-01), Fickelscher
patent: 4510207 (1985-04-01), Mehada et al.
patent: 5128836 (1992-07-01), Fukuoka et al.
European Search Report EP 91 31 1298, Mar. 1992.

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