Automated alternating polarity direct current pulse electrolytic

Details Automated alternating polarity direct current pulse electrolytic Automated alternating polarity direct current pulse electrolytic

1981-07-31

1985-05-14

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204 23, 204 56R, 204 58, 204228, 204DIG9, 364500, C25D 518, C25D 1102

Patent

active

045170592

ABSTRACT:
Disclosed is a method and apparatus for electrolytic processing of a metal surface which, in a preferred embodiment, is anodization of an aluminum or aluminum alloy surface. An apparatus and method is provided which automatically senses the process voltage applied to the surface to be anodized and adjusts the duration of anodizing current pulses accordingly. Direct current anodizing pulses are interrupted by non-anodizing pulses which may be either zero current or reverse current pulses. The ratio of anodizing to non-anodizing pulse power is varied during anodizing such that the anodizing to non-anodizing time power ratio is reduced. In a preferred embodiment, a microprocessor follows the process voltage necessary to maintain a constant current flow to the metal surface and reduces the anodizing to non-anodizing time power ratio in a predetermined manner.

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