Abstract
Electrochemical studies in the Li 2SO 4-K 2SO 4 eutectic melt at 625°C are reported. Experimental evidence suggests that the sulphate ion is not directly reduced at an inert metal cathode. The corrosion of metals such as Fe and Ni in molten sulphates appears to result from reaction with SO 3 derived from dissociation of SO 4 2− anions. This dissociation is enhanced by the relative acidity of the metal-ion species. The limiting anodic process was studied by steady state and transient galvanostatic techniques in melts of different basicities. Discharge mechanisms are proposed to explain the observed behaviour.
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