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Studies on the oxidation rate of metallic inert anodes by measuring the oxygen evolved in low-temperature aluminium electrolysis

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Abstract

The rate of oxygen evolution on metallic inert anodes was measured as a function of current density during electrolysis of a low-melting NaF(12)–KF–AlF3 bath ([NaF + KF]/[AlF3] = 1.5 mol mol−1) at 800 °C. The oxidation rate of the anode substrate (A cm−2) was calculated. The anode oxidation process was depressed at the potentials of oxygen evolution. The dynamics of the decrease in the oxidation rate, which were obtained in previous study by the change in geometrical size of the metallic part of the specimen, was reproduced both by the technique proposed and also in potentiostatic electrolysis at potentials below that of oxygen evolution, in some cases, depending on prepolarisation.

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Acknowledgements

This study was financially supported by the Program of the Ural Division of the Russian Academy of Sciences. The authors thank V. M. Chumarev for providing the alloys.

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Authors and Affiliations

  1. Institute of High Temperature Electrochemistry, S.Kovalevskoy, 22, Ekaterinburg, Russia, 620219

    V. A. Kovrov, A. P. Khramov, Yu. P. Zaikov, V. N. Nekrasov & M. V. Ananyev

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  1. V. A. Kovrov
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  2. A. P. Khramov
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  3. Yu. P. Zaikov
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  4. V. N. Nekrasov
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  5. M. V. Ananyev
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Correspondence to V. A. Kovrov.

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Kovrov, V.A., Khramov, A.P., Zaikov, Y.P. et al. Studies on the oxidation rate of metallic inert anodes by measuring the oxygen evolved in low-temperature aluminium electrolysis. J Appl Electrochem 41, 1301–1309 (2011). https://doi.org/10.1007/s10800-011-0345-5

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  • DOI: https://doi.org/10.1007/s10800-011-0345-5

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