Method for continuously monitoring oxide thickness on moving alu

Details Method for continuously monitoring oxide thickness on moving alu Method for continuously monitoring oxide thickness on moving alu

1984-04-06

1985-08-27

Metz, Andrew H.

Chemistry: electrical and wave energy

Processes and products

204 1T, 204 58, 324 61R, C25D 1104

Patent

active

045376646

ABSTRACT:
Either after or during the process of forming aluminum foil for use in making electrolytic capacitors, the formed oxide foil is drawn through two separate electrolytes wherein two electrodes are immersed respectively. An AC voltage source is connected between the two electrodes. The resulting reactive current is a direct measure of the potential capacitance per unit foil area that can be obtained in capacitor manufacturing and is also an indirect measure of the oxide film thickness.

REFERENCES:
patent: 3632486 (1972-01-01), Herrmann et al.
patent: 3962048 (1976-06-01), Gilbert et al.
patent: 3979666 (1976-09-01), MacLean et al.
patent: 3988215 (1976-10-01), Scherr, III
patent: 4014758 (1977-03-01), Kawai et al.
patent: 4226680 (1980-10-01), Cooke et al.
patent: 4370210 (1983-01-01), Yoshihara

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