Abstract
Because of the ability of millimolar concentrations of substituted benzyl alcohols to block hydrogen evolution and to form complexes with the cadmium ions, their addition to cadmium sulfate and chloride plating baths increased the current efficiency for depositing cadmium. In sulfate baths there was generally a linear correlation between the concentration of the cadmium‐alcohol complex and the current efficiency. In the cadmium‐chloride system, in which the alcohol could not displace chloride and form a complex, the current efficiency was primarily related to the blocking of hydrogen evolution. Addition of electron bridging anions also catalyzes the deposition of cadmium, and this mechanism of catalysis does not change upon addition of the alcohol. The catalysis decreases in a very regular fashion as the size of the bridging anion increases, indicating that the electron bridging occurred through holes in the alcohol film. Addition of millimolar nonbridging strong complexing agents inhibits metal deposition and decreases current efficiency. Addition of millimolar surfactants increases the current efficiency by blocking hydrogen evolution.
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