High temperature oxidation behaviour of Ni–Fe–Co anodes for aluminium electrolysis |
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| Authors: | Vivien Chapman Barry J. Welch Maria Skyllas-Kazacos |
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| Affiliation: | aCentre for Electrochemical and Minerals Processing (CEMP), School of Chemical Engineering, University of New South Wales, Sydney, NSW 2052, Australia;bWelbank Consulting Ltd., P.O. Box 207, Whitianga 3542, New Zealand |
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| Abstract: | The oxidation behaviour of ternary NixFeyCoz alloys (where x/y (wt) = 1 and 1.85; z = 0, 10, 30 and 50 wt.%) was studied in air at 800 °C. Alloys were found to follow complex oxidation kinetics, with the highest oxidation rates observed for alloys having 50 wt.% Co. Significant improvements in oxidation resistance were achieved by addition of 10 and 30 wt.% Co to the Ni–Fe system. The decrease in oxidation rate was associated with suppression of Fe2O3 formation in preference for (Co,Ni)xFe3−xO4 growth. The results were discussed in light of the materials requirements for inert anodes for aluminium electrolysis. |
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| Keywords: | A. Superalloys A. Aluminium C. Kinetic parameters C. Oxidation C. Oxide coatings |
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