Abstract
The pyrophosphate electrolyte has been used for brass deposition as a replacement for cyanide electrolytes. However, there is considerable confusion about the current efficiency of brass deposition from this electrolyte. This study uses a rotating disc electrode (RDE), a rotating cylinder electrode (RCE) and a quartz crystal microbalance (QCM) to systematically determine the current efficiency of copper, zinc, and brass deposition from a pyrophosphate electrolyte. Electrodeposition of brass on RCE and QCM show that the current efficiency for copper, zinc as well as brass is well below 100%. Simultaneous measurement of current and frequency at a QCM showed that pyrophosphate is adsorbed at the electrode surface during copper reduction. However, when zinc is present in the solution, pyrophosphate adsorption is blocked.
Published Version
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