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Establishing a Design Strategy for Corrosion Resistant Structural Materials in Molten Salt Technologies

  • Materials Interactions with Molten Salt for Nuclear Reactors
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Abstract

To address the gap in material design strategies for structural components in molten salt-powered technologies, the current work aimed to identify key parameters governing corrosion induced degradation of materials during exposures in molten halide salts. The applicability of the data on dissolution rates of pure metals (e.g., Cr) in a given molten salt to enable predictions of corrosion behavior of multicomponent binary and ternary Fe-based model and Ni-based commercial alloys isothermally exposed in the purified KCl-Mg\({{\hbox {Cl}}_2}\) in quartz capsules at 700 and 800°C was evaluated. The influence of alloy chemistry on initial dissolution rates and the consequent impact on the time-dependent corrosion induced microstructural evolution in the alloy subsurface was predicted with a coupled thermodynamic-kinetic model. The model was well able to predict the Cr depletion in all investigated alloys demonstrating the ability of the proposed approach to enable a unique design strategy for structural materials in molten salts.

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Acknowledgements

A. Willoughby assisted with the experimental work at ORNL. V. Cox is thanked for hel** with metallography and microstructural characterization respectively. J. Keiser and M. Romedenne are thanked for their valuable comments on the paper. This research was sponsored by the US Department of Energy Office of Nuclear Energy, Molten Salt Reactor Campaign and the Nuclear Energy Advanced Modeling and Simulation program.

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Authors and Affiliations

  1. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831-6156, USA

    R. Pillai, D. Sulejmanovic, T. Lowe & B. A. Pint

  2. College of Engineering, Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI, 48109-2104, USA

    S. S. Raiman

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Pillai, R., Sulejmanovic, D., Lowe, T. et al. Establishing a Design Strategy for Corrosion Resistant Structural Materials in Molten Salt Technologies. JOM 75, 994–1005 (2023). https://doi.org/10.1007/s11837-022-05647-9

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