Laboratory-scale performance of a binary Cu-Al alloy as an anode for aluminium electrowinning |
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Authors: | Mark Glucina Margaret Hyland |
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Affiliation: | Chemical and Materials Engineering, The University of Auckland, Private Bag 92019, Auckland 1001, New Zealand |
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Abstract: | A binary Cu-Al alloy (9.4 wt.% Al) has been investigated as a potential inert anode for aluminium electrowinning. Anodes have been tested in a laboratory electrolysis cell both with and without preformed oxides. Electrolysis was conducted in cryolitic electrolytes with anode current densities of 0.5 A cm−2. The anodes operated satisfactorily as measured by electrical parameters. However, substantial corrosion of the Cu-metal substrate was observed. The external oxide generated on pre-treated anodes was porous and allowed the electrolyte to penetrate through to the Cu-metal whereby corrosion was initiated. An untreated anode formed an in situ surface alumina film, but this did not prevent corrosion of the substrate. |
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Keywords: | Inert anode Copper alloys Corrosion SEM XRD |
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