Abstract
The exchange current density (i0) and charge-transfer coefficient (α) for Cr2+/Cr0 and Fe2+/Fe0 couples are studied in molten LiF-NaF-KF eutectic. These two parameters are important for understanding the metal dissolution kinetics and development of corrosion model for applications using LiF-NaF-KF eutectic as coolant or electrolyte. The values are obtained by the optimized fitting of the polarization curves, the Tafel method, and the linear polarization method. The values of i0 of Fe2+/Fe0 couple are about 1 order of magnitude larger than that of Cr2+/Cr0 couple. The exchange current density increases with temperature and obeys the Arrhenius law. The activation energy for the exchange current density is evaluated to be 91 ± 19 kJ/mol for Cr2+/Cr0, and 93 ± 6 kJ/mol for Fe2+/Fe0 in the temperature ranging from 600°C to 750°C. The charge-transfer coefficient of Cr2+/Cr0 couple slightly decreases with the temperature, while the α of Fe2+/Fe0 couple shows little temperature dependence.
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