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Electrodeposition behavior of Zn-Mn alloys was studied by measuring the polarization curves in sulfate baths containing sodium citrate. Zn began to be electrodeposited at about -1.1V (vs. Ag/ AgCl) and the codeposition of Mn was recognized at potentials less noble than -1.4V. This points out a feature of normal codeposition in which the more noble Zn is electrodeposited preferentially to Mn. The effect of the addition of sodium citrate on the partial polarization curves of Zn and Mn was also investigated. It not only lowered the limiting current densities of both Zn and Mn, but also shifted their deposition potentials to the less noble direction. Therefore, both Znand Mn-citrate complexes seemed to be formed in the Zn-Mn alloy plating baths. Lowering the pH of the baths increased the current efficiency for alloy deposition, although white precipitates were formed in the baths during the electrodeposition of the alloys.

Electrodeposition behavior of zinc-manganese alloys from sulfate baths containing sodium citrate.