A complete thermodynamic description is the basis for understanding molten chloride salt compatibility. To date, modeling efforts have focused on the KCl-MgCl<sub>2</sub> pseudobinary, but an assessment of the integral K-Mg-Cl ternary system is needed. Using the Calculation of Phase Diagrams (CALPHAD) method, this work extends the modified quasichemical model already developed for the KCl-MgCl<sub>2 </sub>melt to include K and Mg. This lays the foundation for including other excess metallic additions, i.e. Cr, to the molten salt solution representation. Currently, the model allows for estimating Cr solubility in a molten salt composition to a first approximation using assumptions that will be discussed. Gaps in the experimental data are identified and recommendations for better understanding the thermochemistry and phase equilibria for further parameter validation and refinement are given.

Thermodynamics and corrosion behavior in molten chloride salts

256th National Meeting (2018)

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