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Meeting 2027 TMS Annual Meeting & Exhibition
Symposium Materials and Chemistry for Molten Salt Systems
Presentation Title Electrochemical Characterization of Uranium in Molten MgCl2-NaCl Using a Novel Magnesium Reference Electrode
Author(s) Charles Lhermitte
On-Site Speaker (Planned) Charles Lhermitte
Abstract Scope Molten chloride salts are advanced heat transfer fluids, but electrochemical diagnostics require stable reference electrodes. To address this, a Mg2+/0 reference system was evaluated in molten MgCl2-NaCl, demonstrating potential stability from 500°C to 675°C. This concept was advanced into a sealed Mg/MgCl2 configuration showing ideal nonpolarizable behavior. Using this reference, the electrochemical behavior of UCl3 was investigated at 550°C. Electromotive force (EMF) measurements determined the U3+/U0 formal reduction potential as +0.276 V vs. Mg/MgCl2 (-1.400 V vs. Ag/AgCl 5 mol%). This potential is ~100 mV more positive than in alkali chloride melts due to the hardness of the Mg2+ cation, which destabilizes higher uranium oxidation states via secondary coordination sphere interactions. These systems enable high-fidelity thermodynamic profiling crucial for predicting corrosion.
Proceedings Inclusion? Planned:
Keywords Magnesium, Nuclear Materials, Other

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