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Correlation Between Corrosion Rate and Electrochemical Parameters of Anode Process on the Metallic Electrode in Molten Oxyfluorides

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Light Metals 2024 (TMS 2024)

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

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Abstract

Using metallic anodes enables oxygen evolution during the aluminum reduction in electrolysis cells with vertical electrodes. Although they are considered non-consumable compared to carbon ones, they tend to corrode in molten fluoride media, and the corrosion products end up in aluminum as impurities. The big challenge for the industry is finding the best conditions (anode and bath composition, temperature, and current density) that provide the lowest corrosion rate. The most reliable way to characterize the corrosion rate is to perform an electrolysis test and determine the mass of anode components in the produced aluminum. This method is highly time- and resource-demanding. This paper investigates the connection between the electrochemical parameters of the anode process, which can be measured in minutes, and the results of long-term electrolysis tests. Several parameters, such as exchange current density on clean and oxidized surfaces, were studied in the low-temperature KF-NaF-AlF3-Al2O3 melt at 800 °C. A linear dependency between exchange currents and corrosion rate was found.

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Acknowledgements

This work was financed by the Ministry of Economy, Industry, Climate Protection, and Energy of the State of North Rhine-Westphalia within the project ‘CO2-free Aluminium Production’ with the Grant EFO0113D.

Author information

Authors and Affiliations

  1. IME Process Metallurgy and Metal Recycling, RWTH Aachen University, 52056, Aachen, Germany

    Andrey Yasinskiy & Bernd Friedrich

  2. Laboratory of Physics and Chemistry of Metallurgical Processes and Materials, Siberian Federal University, 660025, Krasnoyarsk, Russia

    Andrey Yasinskiy

  3. Key Laboratory for Ecological Metallurgy of Multimetallic Minerals (Ministry of Education), Northeastern University, Shenyang, 110819, China

    Andrey Yasinskiy

  4. Chair of Metallic Materials, Saarland University, 66123, Saarbrücken, Germany

    Thomas Jamieson & Isabella Gallino

  5. Department of Engineering, Reykjavik University, 102, Reykjavik, Iceland

    Kamaljeet Singh

  6. Department of Materials Science and Engineering, NTNU, 7491, Trondheim, Norway

    Kamaljeet Singh

  7. IceTec, Arleynir 8, 112, Reykjavik, Iceland

    Guðmundur Gunnarsson

  8. Arctus Aluminum Limited, Arleynir 8, 112, Reykjavik, Iceland

    Jon Magnússon

  9. TRIMET Aluminium SE, 45356, Essen, Germany

    Dominic Feldhaus & Roman Düssel

Authors
  1. Andrey Yasinskiy
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  2. Thomas Jamieson
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  3. Kamaljeet Singh
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  4. Guðmundur Gunnarsson
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  5. Jon Magnússon
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  6. Dominic Feldhaus
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  7. Roman Düssel
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  8. Isabella Gallino
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  9. Bernd Friedrich
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Corresponding author

Correspondence to Andrey Yasinskiy .

Editor information

Editors and Affiliations

  1. Oculatus Consulting, Marietta, GA, USA

    Samuel Wagstaff

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© 2024 The Minerals, Metals & Materials Society

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Yasinskiy, A. et al. (2024). Correlation Between Corrosion Rate and Electrochemical Parameters of Anode Process on the Metallic Electrode in Molten Oxyfluorides. In: Wagstaff, S. (eds) Light Metals 2024. TMS 2024. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-031-50308-5_76

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