Method of coating aluminum with alkali metal molybdenate-alkali

Details Method of coating aluminum with alkali metal molybdenate-alkali Method of coating aluminum with alkali metal molybdenate-alkali

1991-06-18

1994-01-04

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Forming nonmetal coating using specified waveform other than...

205321, 205322, 205323, 205324, 205325, C25D 1100, C25D 1102

Patent

active

052757137

ABSTRACT:
Method for coating a rectifier metal (aluminum) with alkali metal molybdenate/alkali metal silicate or alkali metal tungstenate/alkali metal silicate comprises immersing a rectifier metal (anode) and a cathodic metal in an electrolytic solution and imposing voltage potential between the two electrodes. The voltage is first raised to about 240 to about 260 volts during an oxidation stage, and thereafter to about 380-420 volts to form the desired coating.
Unique electrolytic solutions are provided for the electrodeposition method.

REFERENCES:
patent: 4082626 (1978-04-01), Hradcovsky
patent: 4659440 (1987-04-01), Hradcovsky
A. Kenneth Graham, Electroplating Engineering Handbook, Second Edition, Reinhold Publishing Corp., New York, 1962, p. 55.

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