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Electrochemical Processing of a Heavy W–Ni–Fe Alloy by Direct and Alternating Currents in Ammonia–Alkali Solutions

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Abstract

The electrochemical behavior of a heavy tungsten alloy W–Ni–Fe ((wt %): 78.8 W, 15.2 Ni, 6.0 Fe) in solutions of sodium hydroxide (2–6 M) and ammonium hydroxide (0–6 M) is studied by linear voltammetry in the potentiodynamic mode, galvanostatic electrolysis, and electrolysis using sinusoidal alternating current (ac) of the industrial frequency. A high rate of alloy dissolution is revealed for both alkaline and ammonia–alkali solutions under the direct current (dc) conditions. When tungsten is etched off from the W–Ni–Fe alloy surface, the rate of its electrochemical oxidation is shown to decrease because of the enrichment of the alloy surface in an Fe–Ni solid solution, which is electrochemically passive in alkaline electrolytes. The addition of ammonium hydroxide to the electrolyte exerts a positive effect on the oxidation. The destructive action of ac on the processed material surface enriched in nickel and iron is elucidated; this action intensifies the subsequent oxidation of the material. Alternative application of dc and ac is found to be reasonable to optimize the main parameters (dissolution rate, current efficiency) of the electrochemical dissolution of the W–Ni–Fe alloys in ammonia–alkali electrolytes.

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Funding

This work was performed in terms of state assignment no. 075-00746-19-00.

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Authors and Affiliations

  1. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, 119991, Moscow, Russia

    O. G. Kuznetsova, A. M. Levin, M. A. Sevost’yanov, O. I. Tsybin & A. O. Bol’shikh

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  1. O. G. Kuznetsova
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  2. A. M. Levin
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  3. M. A. Sevost’yanov
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  4. O. I. Tsybin
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  5. A. O. Bol’shikh
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Correspondence to O. G. Kuznetsova.

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Translated by E. Yablonskaya

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Kuznetsova, O.G., Levin, A.M., Sevost’yanov, M.A. et al. Electrochemical Processing of a Heavy W–Ni–Fe Alloy by Direct and Alternating Currents in Ammonia–Alkali Solutions. Russ. Metall. 2021, 586–593 (2021). https://doi.org/10.1134/S0036029521050104

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  • DOI: https://doi.org/10.1134/S0036029521050104

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