A complete thermodynamic description is the basis for understanding molten salt compatibility. The behavior with Cr is important as Cr is a constituent of many structural alloys being considered for applications utilizing Cl bearing salts. Prior modeling work has extended the Calculation of Phase Diagrams (CALPHAD) assessment of the KCl-MgCl2 pseudobinary to the integral K-Mg-Cl true ternary by allowing for excess K or Mg via F-centers. This lays the foundation for including other excess metallic additions for multicomponent thermodynamic assessments that can more accurately represent corrosion behavior. Using this approach the inclusion of excess Cr as well as CrCl2 and CrCl3 species in the Modified Quasichemical (MQC) model for the melt will be discussed. Phase diagram illustrations and thermochemical calculations using the MQC will be presented and compared with experimental corrosion results where appropriate.

Modeling Cr dissolution in molten KCl-MgCl2

2019 Fall National Meeting

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