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Properties of Zinc alloy electrodeposits produced from acid and alkaline electrolytes

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Abstract

Zinc–cobalt (Zn–Co) and zinc–nickel (Zn–Ni) alloy electrodeposits each prepared from acid and alkaline formulations were compared for their properties. Compared to alkaline baths, acid baths offer higher metal percent of the alloying element and higher current efficiency. In alkaline baths, the variation of metal percent in deposit with current density is less significant, but that of current efficiency with current density is more. Electrolyte pH does not change significantly in alkaline solutions compared to acid solutions. X-ray diffraction evaluation of Zn–Co deposits from both electrolytes indicated their presence in the η-phase, while Zn–Ni shows pure γ-phase for deposits obtained from alkaline solutions and the existence of γ-phase with traces of η-phase of zinc for deposits obtained from the acid electrolytes. Scanning electron microscope examination shows finer grain structure for deposits obtained from alkaline solutions, and atomic force microscope studies confirm their nanostructure with reduced surface roughness. Deposits obtained from the alkaline baths exhibited higher corrosion resistance probably due to their nanostructure.

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Acknowledgment

The authors wish to express their sincere thanks to the Director, CECRI for the encouragement given and permission to publish this paper.

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  1. Central Electrochemical Research Institute, Karaikudi, 630 006, Tamil Nadu, India

    Chandrasekar M. S., Shanmugasigamani Srinivasan & Malathy Pushpavanam

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  1. Chandrasekar M. S.
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  2. Shanmugasigamani Srinivasan
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  3. Malathy Pushpavanam
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Correspondence to Malathy Pushpavanam.

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M. S., C., Srinivasan, S. & Pushpavanam, M. Properties of Zinc alloy electrodeposits produced from acid and alkaline electrolytes. J Solid State Electrochem 13, 781–789 (2009). https://doi.org/10.1007/s10008-008-0607-2

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  • DOI: https://doi.org/10.1007/s10008-008-0607-2

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