The ability to predict corrosion phenomena in molten salt reactors (MSRs) is integral to the development and licensing of any MSR. Iron is the major constituent of 316H stainless steel and a significant constituent of Hastelloy-N, the two alloys being considered as potential structural materials for use in MSRs. Developing thermochemical models and values for Fe-based corrosion products, as well as the interaction of corrosion products with evolving molten salt compositions is key to understanding corrosion phenomena in potential MSRs. We analyzed the pseudo-binary systems of iron with the fluorides of Li-Na-K (FLiNaK) via the Computer CALculation of PHAse Diagrams (CALPHAD) method, using data mining and original DSC measurements for necessary information to develop thermochemical models for the systems. The developed pseudo-binary models were interpolated to next generate pseudo-ternary and pseudo-quaternary systems of FeF<sub>2</sub> with LiF, NaF and KF. This effort constitutes the first phase equilibria measurements for the pseudo-binary systems of FeF<sub>2</sub> with LiF and KF. It also represents the first reported pseudo-ternary and pseudo-quaternary systems models of Fe with the fluorides of Li-Na-K.

Generating accurate thermochemical models for alloy corrosion-relevant systems in molten salt reactors and demonstrating computed equilibria in complex systems

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ACS Fall 2022

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.