| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials and Chemistry for Molten Salt Systems
|
| Presentation Title |
Effects of Transition Metal Impurities on the Corrosion of Ni-based Alloy in Molten Fluoride Salt |
| Author(s) |
Nayoung Kim, Weiyue Zhou, Michael Short |
| On-Site Speaker (Planned) |
Nayoung Kim |
| Abstract Scope |
Fluoride molten salts, with promising thermophysical and neutronic properties, are candidates for fuel and coolant of molten salt reactors (MSRs). It is crucial to study their compatibility with potential structural materials for safe operations of MSRs. Previous studies focus on the dissolution of alloys by moisture and oxygen or high-concentration cationic impurities. However, we have discovered that the cathodic half reactions by low-concentration metallic impurities, that may exist after extensive purification, are equally important. This study investigates how relatively low-concentration transition metal impurities in FLiNaK salts affect the corrosion of Ni-20Cr alloys. Corrosion morphology and extent measured by SEM/EDX revealed that low-concentration transition metal impurities are vital to predicting corrosion behavior. Different impurity-alloy systems were therefore more deeply explored to elucidate the electrochemical mechanism behind the impurity-driven corrosion. This investigation provides a comprehensive understanding of corrosion mechanism at realistic and understudied impurity concentrations, offering another corrosion-control strategy apart from purification. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Characterization, Process Technology |