Abstract
Abstract Cathodic overvoltage measurements on aluminium-copper alloys in cryolite melts were made by a steady-state interruption technique. For a cathodic current density of 1 A·cm−2 at 960°C the cathodic overvoltage was 160 mV. The results were used to calculate the electrical field strength and the thickness of the diffusion layer. The diffusivities of Na+ and F− ions in molten cryolite at 1000°C were found to be 9.1·10−5cm2s−1 and 4.9·10−5cm2s−1, which agree well with the data reported in the literature.
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