Abstract
A. C. electropainting has not been commercially applied because of the following reasons due paimarily to the presence of reverse direction current: (1) low paint deposition rate, (2) low coulombic yield, and (3) high electric power loss. The present work is concerned with the development of a new electropainting process utilizing a specially made electrode which has a function of both rectifier and condenser of high capacity. The features of this new electropainting process may be summarized as follows: (1) A special electrode is prepared by forming anodic oxide film of certain thickness on either Ta, Nb, Zr, Ti, Al or their alloys so that it warks as both condenser and rectifier. (2) Percentage of reverse direction current is kept within 20% of right direction current by controlling the area ratio of the electrodes or the thickness of anodic oxide film. (3) Phase angle (φ) of bath current under reverse direction voltage is kept at π/3≤φ≤π/2.
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