| Abstract Scope |
Redox potential, E^0' vs. Cl2/Cl-, and activity coefficient, γ, of Ni2+/Ni are being investigated for the first time in MgCl2-KCl-NaCl (53.9-24.3-21.8 wt%) molten salt. In this study, an innovative application of in-situ electrochemical method, Chronopotentiometry (CP), is used to measure the redox potential for threeNiCl2 concentrations, 1 wt%, 3 wt% and 5 wt% at 873K - 1073K. In this temperature interval, the formal potentials of different NiCl2 concentrations appear to be the same, which is described as E^0'=-1.35591+0.00057*T, where T is the temperature in K. The activity coefficients of NiCl2ranges from 3.423 – 1.370 and are calculated using the supercooled NiCl2 Gibbs energy of formation. These results can be used to evaluate the corrosion behavior for Ni based alloy in this ternary molten salt. |