Structure and high-temperature oxidation behaviour of Cu-Ni-Fe alloys prepared by high-energy ball milling for application as inert anodes in aluminium electrolysis |
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| Authors: | S. Helle B. Assouli D. Guay |
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| Affiliation: | a INRS-Énergie Matériaux Télécommunication, 1650 Boulevard Lionel Boulet, Varennes, Québec, Canada J3X 1S2
b Kingston Process Metallurgy Inc., Kingston, Ontario, Canada K7P 1P2 |
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| Abstract: | CuxNi85−xFe15 (0 ? x ? 85 wt.%) compounds were prepared by mechanical alloying. Monophased face centered cubic (fcc) Cu-Ni-Fe alloys were obtained after 10 h of milling for x varying from 0 to 50, whereas bi-phased compounds fcc Cu-Ni-Fe + body centered cubic (bcc) Fe were formed with richer-Cu compounds. Their oxidation kinetics in air at 750 °C is parabolic for all compositions and increases drastically for x > ∼30. A stable anode for aluminium electrolysis in low-temperature (700 °C) KF-AlF3 electrolyte was obtained for 65 ? x ? 85. However, a substantial increase of the Cu contamination in produced aluminium was observed for x > 70. |
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| Keywords: | A. Alloys A. Copper B. Galvanostatic B. SEM B. XRD C. High-temperature corrosion |
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