In Section 3, we present two separate experiments dedicated to determining, in situ, the structure and concentrations of corrosion products in molten LiF-NaF-KF eutectic (FLiNaK). We found that monitoring the corrosion process in situ using XAS captures much more than the rate at which the NiCr foil corroded into the salt. Our experiments revealed an initial increase of Ni 2+ concentration within the salt that stabilized with fluctuations occurring throughout. At a later stage of corrosion we found metallic Ni signal, which we attributed to the liberation of small grains from the foil into the melt as a result of Cr dealloying. Post-corrosion, we measured concentration profiles of Ni 2+ and Ni 0 with distance from the NiCr foil edge. The profiles cannot be described by a simple diffusion equation, likely as a result of thermal convection. Our initial simultaneous XAS and electrochemical measurements showed correlations between the two signals. The open circuit potential and Ni metal absorption signals peaked at nearly the same time, which we attribute to electrostatic perturbations in the cell when grains separated from the foil into the melt.