Method for the manufacture of capacitive electronic discs

Details Method for the manufacture of capacitive electronic discs Method for the manufacture of capacitive electronic discs

1980-09-05

1981-12-15

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

148 62, C25D 110, C23F 900

Patent

active

043057918

ABSTRACT:
A method for passivating the surface of a recorded metal substrate in which the substrate is immersed for 5-30 minutes in a 35.degree. C.-85.degree. C. aqueous bath containing from about 5 to 30 g/l of an alkaline cleaner and from about 2.5 to 20 g/l of sodium dichromate, potassium dichromate, sodium permanganate, potassium permanganate, or mixtures thereof.

REFERENCES:
patent: 2530842 (1950-11-01), Ruggieri
patent: 2748035 (1956-05-01), Duncan
patent: 3293148 (1966-12-01), Dell
patent: 3904488 (1975-09-01), Nosker
patent: 4109028 (1978-08-01), Owen

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