Abstract
The deposition and dissolution of aluminium in an acidic cryolite melt was studied using a graphite electrode. The techniques employed were cyclic voltammetry, current reversal chrono-potentiometry ( crc) with and without a varying delay time at zero current between the cathodic and anodic current pulses. The graphite electrode had to be preconditioned by immersion in the melt for 10–12 h so that the surface became saturated in sodium before Al deposition could be observed. Co-deposition of Na on the graphite surface could not be avoided. crc with delay was used to calculate the dissolution rate of aluminium in molten cryolite. The rate of aluminium dissolution was similar for both tungsten and graphite electrodes, showing little interaction between deposited aluminium and the substrate.
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