抄録
The present study refers to the basic factors that affect electrodeposition behavior at the initial stage when electropainting, particulary high-speed electropainting, is applied onto metals. First, 12 types of ED paints have been used to find out certain properties of electropainting. As a result, it has been ascertained that coulombic yields are used like as electrochemical equivalent values for the electrochemical study of electropainting. Second, a paint bath of stable acryl co-polymer system has been used to measure the anodic potential-time curves and ED current-time curves using several kinds of metals (steel plates and cold-rolled steel sheets coated with Zn, Sn, Cr, or Al, respectively) under a constant bath voltage. The results have proved that: 1) The decay curves of ED current vary with the substrate metals and are not caused by the development of the deposited paint film. 2) Electric resistance of deposited paint film measured on a metal net is substantially smaller than that estimated from anodic potential and ED current in electropainting under constant bath voltage method.
