Process for plating lead dioxide

Details Process for plating lead dioxide Process for plating lead dioxide

1978-04-21

1978-12-19

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

C25B 130

Patent

active

041304675

ABSTRACT:
A method of completely coating a plurality of substrates with lead dioxide by electrolysis while the substrates are immersed in an electrolyte containing a lead salt. Each substrate has curved surfaces and is able to roll freely. The method comprises tumbling the substrates in a porous barrel rotating about a central anode feeder at a speed of three to eight revolutions per minute. Substrates contact the anode feeder throughout the electrolysis. The anode feeder is of a material that does not dissolve or passivate in the electrolyte under the reaction conditions during the electrolysis. The temperature during the electrolysis is maintained at less than 70.degree. C. A positive current is applied to the anode feeder to maintain an anode current density in the range 1 to 8 milliamps per square centimeter throughout the electrolysis. A negative current is applied to a cathode spaced from the anode.

REFERENCES:
patent: 900502 (1908-10-01), Ferchland et al.
patent: 925599 (1909-06-01), Russ et al.
patent: 1254046 (1918-01-01), King
patent: 2133324 (1935-10-01), Hosdowich
patent: 2606148 (1952-08-01), Portanova et al.

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