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Title: Electrodeposition and compositional behaviour of Zn-Ni alloy
Authors: Thangaraj, V.
Chitharanjan, Hegde, A.
Issue Date: 2007
Citation: Indian Journal of Chemical Technology, 2007, Vol.14, 3, pp.246-252
Abstract: This paper discusses the optimization of an electroplating bath for smooth and uniform deposition of zinc-nickel alloy on mild steel. Electroplating has been carried out in a chloride bath using glycine and gelatin as additives. The effect of bath conditions and operating parameters on chemical composition, micro-hardness and appearance of the deposit have been studied and discussed. The experimental results reveal that a bright Zn-Ni alloy having about 13.6 %Ni is showing good performance against corrosion. The corrosion resistance of the deposit is found to be characteristic of its %Ni content, and is improved drastically after chrome passivation. The bath follows anomalous codeposition with preferential deposition of Zn over the entire current density range used for the study. The increase of %Ni in the deposit with current density is due to the depletion of more readily depositable Zn2+ ions at the cathode. No transition current density, at which the codeposition behaviour changed from the anomalous to normal type, was observed during the study. The increase of %Ni in the deposit at high current density (cd.) is attributed to high ratio of Ni2+/Zn2+ in the bath. The effect of temperature on the plating process showed that codeposition of metals on the cathode is diffusion controlled.
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