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Corrosion Studies of Nickel-Based Alloys in Chloride Salts for Molten Salt Reactors

Molten chloride salts are one of the leading candidates for heat transfer fluids and thermal energy storage for generation IV Molten Salt Reactors (MSRs). These chloride salts demonstrate many favorable properties such as low melting temperatures, high boiling points, high heat capacity, and low vapor pressure at higher temperatures. Ternary chlorides such as NaCl-KCl-MgCl2 used in this study are particularly attractive due to their lower melting points and high decomposition temperatures.

Product Number: 51323-19567-SG
Author: Kentaro Lunn, Nicholas Ury, Karla Sanchez, Harjot Singh, Kristopher Erlitz, Logan Gallegos, An Nguyen and Juan Nava, Vijay K. Vasudevan, Boateng Donkor, Sonali Ravikumar, G. Muralidharan, Jie Song, Steven Zinkle, Vilupanur Ravi
Publication Date: 2023
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Molten Salt Reactors (MSRs) are a promising alternative to the current generation of light-water reactors. However, the corrosivity of molten salts is a significant issue that must be understood before MSRs become commercial. Ni-base superalloys are promising candidate materials that can provide corrosion resistance in molten salt environments and serve as reliable structural materials for reactor operation. In this study, immersion studies of three different Ni-base superalloys were conducted in ternary chloride salts at 750°C. Post-test characterization included mass change per unit area, X-ray diffraction, and microstructural evaluation using optical microscopy, and scanning electron microscopy coupled with energy dispersive X-ray spectroscopy. The effect of alloying additions on molten chloride corrosion is discussed.

Molten Salt Reactors (MSRs) are a promising alternative to the current generation of light-water reactors. However, the corrosivity of molten salts is a significant issue that must be understood before MSRs become commercial. Ni-base superalloys are promising candidate materials that can provide corrosion resistance in molten salt environments and serve as reliable structural materials for reactor operation. In this study, immersion studies of three different Ni-base superalloys were conducted in ternary chloride salts at 750°C. Post-test characterization included mass change per unit area, X-ray diffraction, and microstructural evaluation using optical microscopy, and scanning electron microscopy coupled with energy dispersive X-ray spectroscopy. The effect of alloying additions on molten chloride corrosion is discussed.

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