Passivating and silver removal method

Details Passivating and silver removal method Passivating and silver removal method

1981-07-16

1982-12-14

Tufariello, T.

Chemistry: electrical and wave energy

Processes and products

204 12, C25D 122

Patent

active

043637051

ABSTRACT:
In the production of records, a mother is formed from a metal master having a nickel core and a silver coating. To produce the mother, the silver coating is removed from the nickel core and the nickel is passivated by treating the metal master with an aqueous solution containing ammonium persulphate. The same aqueous solution can be used for passivating the mother before the mother is electroplated to form a stamper.

REFERENCES:
patent: 1531140 (1925-03-01), Schneider
patent: 2530842 (1950-11-01), Ruggieri
patent: 2758961 (1956-08-01), Kosowsky
patent: 3186932 (1965-06-01), Gelfand et al.
patent: 4188240 (1980-02-01), Yoshio
patent: 4190503 (1980-02-01), Ikeda

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