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Role of Mo6+ during nickel electrodeposition from sulfate solutions

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Abstract

The effect of Mo6+ on the current efficiency, deposit quality, surface morphology, crystallographic orientations and polarisation behaviour of the cathode during electrodeposition of nickel from sulfate solutions was investigated. Mo6+ did not have a significant effect on current efficiency over the concentration range 2–100 mg dm−3. However; a decrease in current efficiency by a magnitude of more than 20% was seen at 500 mg dm−3. The quality of the nickel deposit with reference to the visual appearance and contamination level varied with varying concentration of Mo6+; this was also reflected in the morphology and crystallographic orientations of the deposits. Addition of Mo6+ to the electrolyte introduced two new crystal planes i.e., (220) and (311). Depolarisation of the cathode was noted at lower concentrations of Mo6+ (2–40 mg dm−3) whereas polarisation of the cathode was observed at Mo6+ concentration >40 mg dm−3 .The effect of Mo6+ on parameters such as Tafel slope (b), transfer coefficient (α) and exchange current density (i 0) were also determined.

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Acknowledgements

USM would first like to thank the CSIR for granting him a research fellowship. The authors thank P. Fallon for assistance with SEM, K. Seymour for XRD and T. B. Issa for general assistance throughout the work. The authors also thank the Director, Regional Research Laboratory Bhubaneswar for his kind permission to publish this paper. Financial support was partly received from the A. J. Parker Cooperative Research Centre for Hydrometallurgy.

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Authors and Affiliations

  1. Centre for Micro Nano Science and Technology, National Cheng Kung University, Tainan, 701, Taiwan, ROC

    U. S. Mohanty

  2. Institute of Minerals and Materials Technology (CSIR), Bhubaneswar, 751 013, India

    B. C. Tripathy, S. C. Das & V. N. Misra

  3. Hydro Metallurgy Division, MINTEK, 200 Hans Stridjom Drive, Randburg, 2125, South Africa

    B. C. Tripathy

  4. Department of Chemistry, Murdoch University, Perth, WA, 6150, Australia

    P. Singh

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  1. U. S. Mohanty
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  2. B. C. Tripathy
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  3. P. Singh
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  4. S. C. Das
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  5. V. N. Misra
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Correspondence to U. S. Mohanty.

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Mohanty, U.S., Tripathy, B.C., Singh, P. et al. Role of Mo6+ during nickel electrodeposition from sulfate solutions. J Appl Electrochem 38, 239–244 (2008). https://doi.org/10.1007/s10800-007-9431-0

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  • DOI: https://doi.org/10.1007/s10800-007-9431-0

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