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Anodic dissolution of chromium at high current densities in sodium nitrate electrolyte

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Abstract

The dissolution mechanism of pure chromium at high current density characteristic for electrochemical machining processes is studied. The combination of electrochemical, microscopic, and spectroscopic techniques leads to a comprehensive interpretation of the dissolution mechanism. The polishing quality increases with increasing nitrate concentration and current density, respectively. The oxygen evolution amounts up to 45% of the consumed anodic charge and the apparent valence of the chromium dissolution decreases with increasing applied potential down to z = 3.5. The authors explain this phenomenon by a passive dissolution of chromium via Cr3+ followed by a chemical oxidation of Cr3+ to dichromate under nitrate reduction to nitrogen.

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Funding

The Philips Consumer Lifestyle (Drachten NL) financially supported this study.

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Authors and Affiliations

  1. Fraunhofer IKTS Dresden, Winterbergstr. 28, 01277, Dresden, Germany

    M. Schneider & L. Simunkova

  2. Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, 40225, Düsseldorf, Federal Republic of Germany

    M. Manko & M. M. Lohrengel

  3. Philips Consumer Lifestyle, P.O. Box 20, 9200 AE, Drachten, Netherlands

    W. Hoogsteen

Authors
  1. M. Schneider
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  2. L. Simunkova
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  3. M. Manko
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  4. M. M. Lohrengel
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  5. W. Hoogsteen
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Correspondence to M. Schneider.

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Schneider, M., Simunkova, L., Manko, M. et al. Anodic dissolution of chromium at high current densities in sodium nitrate electrolyte. J Solid State Electrochem 23, 345–350 (2019). https://doi.org/10.1007/s10008-018-4140-7

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  • DOI: https://doi.org/10.1007/s10008-018-4140-7

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