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High-rate electrochemical dissolution of Ni–Cu alloys in nitrate electrolyte

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Abstract

High-rate anodic dissolution of nickel, copper, and two alloys Ni30Cu70 and Ni65Cu32 in NaNO3 solution was studied, using a flow-channel electrochemical cell. In all experiments, the initial interelectrode distance was 208 μm and the electrolyte velocity was 15 m s−1. The dependence of the current efficiency and surface brightening on the current density was determined. Voltage transients at various current densities were measured and voltammograms were constructed. Compared to nickel and copper, the alloys showed intermediate behaviour, especially at j > j 1. The shape of the voltage transients and the occurrence of surface brightening were more suitable to detect the existence of a limiting current region than voltammograms, especially for Ni. Using the voltammograms and literature data, anodic and cathodic potentials and the voltage drop in the interelectrode gap at a given current density were estimated for j < j 1.

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Author notes

  1. S. Kuindersma

    Present address: Philips Enabling Technologies Group, Zwaanstraat 1, 5600 JC, Eindhoven, The Netherlands

Authors and Affiliations

  1. Laboratory for Technology and Materials, Philips Domestic Appliances and Personal Care BV, Oliemolenstraat 5, PO Box 20100, 9200 CA, Drachten, The Netherlands

    W. Hoogsteen

  2. Frumkin Institute of Electrochemistry, Russian Academy of Sciences, Leninskii Prospekt 31, Moscow, 117071, Russia

    A.D. Davydov

Authors
  1. W. Hoogsteen
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  2. S. Kuindersma
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  3. B.P. Minks
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  4. A.D. Davydov
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Correspondence to W. Hoogsteen.

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Hoogsteen, W., Kuindersma, S., Minks, B. et al. High-rate electrochemical dissolution of Ni–Cu alloys in nitrate electrolyte. Journal of Applied Electrochemistry 32, 1029–1037 (2002). https://doi.org/10.1023/A:1020984431484

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