抄録
Pulse plating of Cu-Zn alloy from cyanide brass plating baths was investigated with respect to the effect of pulse electrolysis with galvanostatic square pulses on the potential-current curves, current efficiency and composition of brass deposit. It was found that pulse plating yielded a brass deposit of uniform composition with a brighter appearance and finer crystal grain than that obtained under direct current electrolysis, and that the effect of pulse plating at a high pulsed-current density was mainly influenced by the increased deposition overpotential and the off period in each cycle where there is zero current in the external circuit. It was also noted that the electrodeposition mechanism changed from the regular type to the irregular type with increasing pH in the vicinity of electrode surface, since high pulsed current electrolysis resulted in a greatly increased hydrogen evolution reaction.
