About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials and Chemistry for Molten Salt Systems
|
| Presentation Title |
The Role of Impurity Identity and Concentration on the Dealloying Behavior of Binary Ni-20Cr Alloy in Molten FLiNaK |
| Author(s) |
Harjot Singh, Ho Lun Chan, Elena Romanovskaia, Valentin Romanovski, John Scully |
| On-Site Speaker (Planned) |
Harjot Singh |
| Abstract Scope |
The operational reliability of molten salt reactors (MSRs) faces barriers, including structural material degradation. Molten fluoride salts are leading coolants for heat-exchange loops operating between 500-700°C. Salt impurities (e.g., metallic cations, HF) have been recognized as sufficient to induce corrosion in MSR alloys, even at ppm concentrations. Recent studies employ electrochemical techniques (e.g., potentiodynamic polarization, chronoamperometry) to drive corrosion in candidate alloys, effectively serving as impurity-similitudes and accelerating testing relative to immersion or capsule-based experiments. However, validation of electrochemical methods for probing corrosion mechanisms in molten salts is needed. This study examines Ni-Cr alloy corrosion and damage morphologies in molten FLiNaK. Specimens were subjected to a constant electrochemical potential while the pre-purified salt contained graded concentrations of H<sub>2</sub>O, EuF<sub>2</sub>, or CrF<sub>2</sub>. Transient currents, impedance spectra, and ICP were measured in-situ to determine kinetics and evolving corrosion. Post-exposure, specimen surfaces and cross-sections were examined via SEM coupled with EDS and EBSD. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, High-Temperature Materials, Other |