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 radioactiv e plants using acid tritiated water solutions containing Cl- and F- io ns. The polarization and voltammetric curves show the localized corros ion region over a wide range of potentials going from the corrosion po tential up to the passivity and transpassivity. This indicates that th e localized corrosion occurs in the active potentials. The voltammetri c curves and electrochemical impedance diagrams show the effect of pot ential, pH, Cl-, and F- concentrations on Inconel 600 behavior in the overlapping active and localized corrosion regions. These indicate tha t there are definitely reactions with the oxide layer and that there a re several processes occurring simultaneously: adsorption of Cl- and F -, localized and active corrosion, oxide layer dissolution and ionic d iffusion. The experimental data and simulated spectra were fitted by e quivalent circuits and the component values were determined.