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Volume 26 Issue 5
May  2019
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文章导航 >  矿物冶金与材料学报（英文）  > 2019  >  26(5): 649-656
Jon Derek Loftisand Tarek M. Abdel-Fattah, Nanoscale electropolishing of high-purity nickel with an ionic liquid, Int. J. Miner. Metall. Mater., 26(2019), No. 5, pp. 649-656. https://doi.org/10.1007/s12613-019-1773-1
Cite this article as:
Jon Derek Loftisand Tarek M. Abdel-Fattah, Nanoscale electropolishing of high-purity nickel with an ionic liquid, Int. J. Miner. Metall. Mater., 26(2019), No. 5, pp. 649-656. https://doi.org/10.1007/s12613-019-1773-1
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研究论文

Nanoscale electropolishing of high-purity nickel with an ionic liquid

  • Applied Research Center at Thomas Jefferson National Accelerator Facility and Department of Molecular Biology and Chemistry at Christopher Newport University, Newport News, VA 23606, USA

  • Department of Physical Sciences, Virginia Institute of Marine Science, College of William and Mary, Gloucester Point, VA 23062, USA

  • Faculty of Sciences, Alexandria University, P.O. Box 426, Ibrahimia 21321, Alexandria, Egypt

  • 通讯作者:

    Tarek M. Abdel-Fattah    E-mail: fattah@cnu.edu

  • High purity (>99.9% composition) nickel metal specimens were used in electropolishing treatments with an acid-free ionic liquid electrolyte prepared from quaternary ammonium salts as a green polishing solution. Voltammetry and chronoamperometry tests were conducted to determine the optimum conditions for electrochemical polishing. Atomic force microscopy (AFM) revealed nanoscale effectiveness of each polishing treatment. Atomic force microscopy provided an overall observation of the material interface between the treated and unpolished regions. Surface morphology comparisons summarized electrochemical polishing efficiency by providing root-mean-square roughness averages before and after electrochemical polishing to reveal a mirror finish six times smoother than the same nickel metal surface prior to electropolishing. This transition manifested in a marked change in root-mean-squared roughness from 112.58 nm to 18.64 nm and producing a smooth mirror finish. Finally, the mechanism of the ionic liquid during electropolishing revealed decomposition of choline in the form of a transient choline radical by acceptance of an electron from the nickel-working electrode to decompose to trimethylamine and ethanol.
    • Research Article

    Nanoscale electropolishing of high-purity nickel with an ionic liquid

    + Author Affiliations
      Abstract
    • High purity (>99.9% composition) nickel metal specimens were used in electropolishing treatments with an acid-free ionic liquid electrolyte prepared from quaternary ammonium salts as a green polishing solution. Voltammetry and chronoamperometry tests were conducted to determine the optimum conditions for electrochemical polishing. Atomic force microscopy (AFM) revealed nanoscale effectiveness of each polishing treatment. Atomic force microscopy provided an overall observation of the material interface between the treated and unpolished regions. Surface morphology comparisons summarized electrochemical polishing efficiency by providing root-mean-square roughness averages before and after electrochemical polishing to reveal a mirror finish six times smoother than the same nickel metal surface prior to electropolishing. This transition manifested in a marked change in root-mean-squared roughness from 112.58 nm to 18.64 nm and producing a smooth mirror finish. Finally, the mechanism of the ionic liquid during electropolishing revealed decomposition of choline in the form of a transient choline radical by acceptance of an electron from the nickel-working electrode to decompose to trimethylamine and ethanol.
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