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Correlation between the Anti-cratering of Surface-treated Steels and the Change of Electric Currents during the Electrodeposition Coating

Synopsis : The effect of the electric current density during the electrodeposition coating on the anti-cratering of surface-treated steels was studied. 1) The electric current density during the electrodeposition coating varied with the time in the slowstart method and many current density peaks were observed. The first peak current density was named as i A, the final peak iB. 2) The iB/iA varied discontinuously with the applied voltage and the voltage, at which the iB/iA increases discontinuously, was named the critical voltage. 3) It was found that the critical voltage was correlated with the tendency for the cratering of surfacetreated steels and the steel having the high critical voltage showed the good anti-cratering properties.