Method for forming a uniform oxide film on a valve metal

Details Method for forming a uniform oxide film on a valve metal Method for forming a uniform oxide film on a valve metal

1975-01-08

1976-06-08

Mack, John H.

Chemistry: electrical and wave energy

Processes and products

204211, 204274, 204275, C25D 706, C25D 1102, C25D 1700, C25D 2102

Patent

active

039620484

ABSTRACT:
In a continuous electrolytic foil forming process employing a source of constant d.c. voltage, the speed with which the foil is drawn through the electrolyte is automatically adjusted by a feedback mechanism to maintain a constant value of forming current, thereby producing an oxide film whose thickness is substantially invariant over the entire length of the foil.

REFERENCES:
patent: 1965399 (1934-07-01), Wehe
patent: 3061534 (1962-10-01), Jasperson
patent: 3536601 (1970-10-01), Hill et al.

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