Interpretation of Inconel 600 behavior in the active region in tritiated water containing chloride-fluoride ions between pH 1 and 3.5

Voltammetric and impedance measurements were carried out to study the corrosion behavior of Inconel 600, a candidate material for radioactive plants using acid tritiated water solutions containing Cl- and F- ions. The polarization and voltammetric curves show the localized corrosion region over a wide range of potentials going from the corrosion potential up to the passivity and transpassivity. This indicates that the localized corrosion occurs in the active potentials. The voltammetric curves and electrochemical impedance diagrams show the effect of potential, pH, Cl-, and F- concentrations on Inconel 600 behavior in the overlapping active and localized corrosion regions. These indicate that there are definitely reactions with the oxide layer and that there are several processes occurring simultaneously: adsorption of Cl- and F-, localized and active corrosion, oxide layer dissolution and ionic diffusion. The experimental data and simulated spectra were fitted by equivalent circuits and the component values were determined.