Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Forming nonmetal coating
Patent
1990-01-02
1991-12-03
Niebling, John F.
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Forming nonmetal coating
205322, 205333, C25D 1102, C25D 1106
Patent
active
050697633
ABSTRACT:
A method is provided for electrolytic coating of a rectifier metal with a hard, adherent, uniform and corrosion-resistant coating which predominates in vanadium oxides. A rectifier metal (anode) and a metal cathode are immersed in the electrolytic bath and voltage potential is applied across the two electrodes and raised to about 280 volts within about 25 to about 35 seconds, and thereafter raised further therefrom to between about 280 and about 360 volts within a few minutes until the desired coating thickness is obtained. The electrolytic bath comprises a mixture of a major amount of alkali metal orthovanadate and a minor amount of alkali metal silicate in water.
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A. Kenneth Graham, Electroplating Engineering Handbook, second edition, Reinhold Publishing Corp., New York, 1962, p. 55.
Leader William T.
Niebling John F.
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