About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials and Chemistry for Molten Salt Systems
|
Presentation Title |
Electrochemical Thermodynamic and Kinetic Properties of Ni2+ in Molten FLiNaK Salt |
Author(s) |
Hojong Kim, Nathan Smith, Zi-Kui Liu, Shunli Shang |
On-Site Speaker (Planned) |
Hojong Kim |
Abstract Scope |
Understanding thermochemical properties of common corrosion products (i.e., Ni2+, Cr3+, Cr2+) from structural materials used in molten salt reactors is important for developing corrosion-resistant alloys and in-situ monitoring of molten salts. Electrochemical techniques including electromotive force (emf) measurements, cyclic voltammetry (CV), chronoamperometry (CA), and electrochemical impedance spectroscopy were utilized to determine thermodynamic and kinetic properties of Ni2+ in eutectic FLiNaK salt. The change in activity of Ni2+ in FLiNaK was determined via emf measurements at T = 475–700 °C for 0.1–20 mol% NiF2 and phase transition temperatures by differential scanning calorimetry. Using 1 mol% NiF2 in the FLiNaK as the reference (Ni/Ni2+), CV and CA were performed to determine the diffusivity and activation energy of Ni2+ in FLiNaK at 475–550 °C in a three-electrode cell. X-ray diffraction at selected NiF2 compositions was measured to determine phase constituents and phase fraction to complement electrochemical measurements. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, Nuclear Materials, Other |