Aluminum foil for electrolytic capacitors

Details Aluminum foil for electrolytic capacitors Aluminum foil for electrolytic capacitors

1991-08-16

1992-07-07

Griffin, Donald A.

Electricity: electrical systems and devices

Electrolytic systems or devices

Solid electrolytic capacitor

420528, H01G 905, C22C 2100

Patent

active

051288362

ABSTRACT:
An aluminum foil for electrolytic capacitors in which the sub-surface layer having a depth range from 0.1 to 0.2 .mu.m below the surface contains at least one element selected from the group consisting of Pb, Bi, and In at a total average concentration ranging from 0.001 to 0.1 wt %, and in which the inner part below the sub-surface layer contains less than 0.0001 wt % average concentration for each of Pb, Bi, and In, and in which the average aluminum purity throughout all layers from the surface to the inner part is not less than 99.90 wt %. This aluminum foil has adequate development of tunnel type etch pits and possesses superior electric characteristics and strength.

REFERENCES:
patent: 3997339 (1976-12-01), Fickelscher

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