Abstract
The effects of pH and the addition of Quadrol on the electrodeposition of Cu-Zn alloys from pyrophosphate baths were studied. Copper was preferentially deposited from the baths without Quadrol. Addition of Quadrol up to 0.3M and KOH caused a decrease in the Cu content of the deposits and a less noble shift in deposition potential. Consequently, deposits containing 70-80% Cu were obtained over a wide range of bath composition at pH of 11.0. The relation between the composition of deposits and deposition potentials was discussed on the basis of a potential-pH diagram for Zn in Cu 70%-Zn 30% alloy. Preferential deposition of Cu was suppressed when the deposition potential was sufficiently less noble for Zn to exist in the metallic form.
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