Electrolytic stripping of cobalt

Details Electrolytic stripping of cobalt Electrolytic stripping of cobalt

1988-04-27

1989-05-09

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412975, C25F 500

Patent

active

048286621

ABSTRACT:
A method of removing a layer of cobalt from an underlying nickel surface of an article comprises the steps of immersing at least part of the article in an aqueous solution of a caustic alkali having a pH value not less than 12.5 and preferably not less than 14, and applying an electrical potential difference between the article and a counter electrode which acts as a cathode to strip the cobalt from the article leaving the nickel passive. The method is particularly suitable for removing a defective cobalt layer from a data storage disc so that the disc can be recoated.

REFERENCES:
patent: 3721626 (1973-03-01), Stanek et al.
patent: 3773629 (1973-11-01), Sieckmann et al.
patent: 4144160 (1979-03-01), Faulkner
patent: 4400248 (1983-08-01), Tomaszewski
patent: 4439289 (1984-03-01), Viglione

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