Equilibrium potentials and polarization curves for aluminum electrodes were measured in molten AlCl
3 (48-63mol% at 500°C and 31-52mol% at 680°C) -NaCl mixtures. The electrode reaction is expressed as Al+4Cl
- = AlCl
4-+3e regardless of AlCl
3 concentration in the melt and temperature. Polarization curves at about 500°C are nearly the same as those at lower temperatures. Although aluminum deposition from AlCl
4- and aluminum dissolution with the consumption of Cl
- are observed not so clearly at lower temperatures or at higher AlCl
3 concentration in the melt, they are obviously recognized at 680°C from a relationship between the wave height on cathodic or anodic polarization curves and the composition of the melt.
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