Electrolytic treatment of a surface

Details Electrolytic treatment of a surface Electrolytic treatment of a surface

1988-10-11

1990-01-16

Tufariello, T. M.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C25F 700

Patent

active

048941360

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: 3825484 (1974-07-01), Fronsman

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