Abstract
The anode process was studied in electrodeposition of water soluble paints (which are composed of alkyd and acryl resins, but no pigments) on plates of steel, aluminum alloys, and copper.The following conclusions were drawn.(1) The total resistance (R) in the circuit for electrophoretic coating was expressed by the following equation:R=R1+R2where R1: Resistance of oxide film (including that of the film in passive state)R2: Resistance of deposited filmR1 and R2 were variables depending on the kind of paint used, and they also varied according to anode materials for the same kind of paint.(2) The state of anode surface during electrodeposition corresponded to one of the folowing four items.a) Being covered by passive film and visible oxide film.b) Being covered by visible oxide film only.c) Being covered by passive film only.d) In active state, being covered neither passive film nor visible oxide film.(3) Most of anode metal, which had been dissolved during electrodeposition, was occluded by the coated film, which resulted in the increase of its electric resistance.
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