About this Abstract |
Meeting |
MS&T22: Materials Science & Technology
|
Symposium
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Tackling Structural Materials Challenges for Advanced Nuclear Reactors
|
Presentation Title |
Electrochemical Determination Kinetic Properties of Ni<sup>2+</sup> and Cr<sup>3+</sup>/Cr<sup>2+</sup> in FLiNaK Molten Salt |
Author(s) |
Nathan Smith, Stephen Lombardo, Hojong Kim, Shunli Shang, Zi-Kui Liu |
On-Site Speaker (Planned) |
Nathan Smith |
Abstract Scope |
Understanding thermochemical properties of common corrosion products (i.e., Ni<sup>2+</sup>, Cr<sup>3+/2+</sup>) from structural materials used in molten salt reactors and loops is important for developing improved corrosion-resistance and in-situ monitoring systems. Electrochemical techniques including cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) were utilized to determine kinetic properties of Ni<sup>2+</sup> and Cr<sup>3+/2+</sup> in FLiNaK at T = 475–625 °C. Cyclic voltammetry and chronoamperometry were performed using a three-electrode cell to determine diffusivity as a function of temperature as well as corresponding activation energies. By varying concentrations of Ni<sup>2+</sup> and Cr<sup>3+/2+</sup> (e.g., 1 mol%, 0.1 mol%, 0.01 mol%) in FLiNaK, formal potentials were also estimated. Complementary characterization including X-ray diffraction (XRD), inductively coupled plasma atomic emission spectroscopy (ICP-AES), and differential scanning calorimetry (DSC) were also employed to confirm and supplement electrochemical results. |