Abstract
The physical and chemical wear of carbon cathode materials for aluminium electrolysis was studied in mixtures of cryolitic melts, alumina and aluminium at 960–1015 °C. The very low wear in aluminium is attributed to poor contact between the metal and the carbon materials due to nonwetting and very low carbide solubility. The much larger wear in cryolitic melt-aluminium system is attributed to the improved wetting and the larger carbide solubility. Under cathodic polarization the samples show even larger wear. The wear mechanism is probably through solid carbide formation and removal with carbide dissolution as the slowest step. Addition of alumina suppresses the wear through physical barriers. Different carbon cathode materials have approximately the same resistance to the chemical corrosion due to Al3C4 formation. The physical wear in cryolitic melts is parallel to room temperature experiments using alumina slurries in polytungstate solution.
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