Experimental study, via current–potential curves, of the anodic behavior of Alloy C-276 and T60 titanium in chlorinated and oxygenated aqueous media under sub- to supercritical conditions

Philippe Botella (1) , Christine Frayret (1) , Th. Jaszay (2) , Marie-Hélène Delville (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 LMF - Laboratoire de mécanique des fluides

This paper presents the behavior of Alloy C-276 and T60 titanium, submitted to anodic polarization under steady-state and quasi-stationary conditions in oxidative chlorinated aqueous media. The measurements were carried out at temperatures and pressures from usual conditions (20 °C, 0.1 MPa) to supercritical conditions (400 °C, 28 MPa). The influence of various parameters such as pH, chloride ions activity, nature of materials, sub or supercritical state of the medium, was investigated. The effect of the temperature gave rise to the determination of activation energies of the dissolution–passivation processes. The hierarchy of the electrochemical behavior of the materials confirmed the results already obtained in a prevoius work using the determination of corrosion rates.

Mots clés: Electrochemistry; Corrosion rate; Nickel-base alloys; Titanium; Anodic ‘current–potential' curves; Supercritical conditions

Domaines: Matériaux

Philippe Botella, Christine Frayret, Th. Jaszay, Marie-Hélène Delville. Experimental study, via current–potential curves, of the anodic behavior of Alloy C-276 and T60 titanium in chlorinated and oxygenated aqueous media under sub- to supercritical conditions. Journal of Supercritical Fluids, 2003, 25 (3), pp.269-278. ⟨10.1016/S0896-8446(02)00151-1⟩. ⟨hal-00258244⟩