DISSOLUTION-PASSIVATION OF TITANIUM IN HIGHLY CHLORINATED AND OXYGENATED AQUEOUS MEDIA. REACTION MECHANISM. APPLICATION TO SUPERCRITICAL WATER OXIDATION CONDITIONS

摘要

This paper presents the study of a specific device leading to electrochemical information on titanium (T60 grade) in conditions simulating hydrothermal oxidation treatment processes (up to 400℃ and 28 MPa and in chlorinated media). The use of a TA6V cell, along with a hydrogen dynamic electrode (H.D.E.) allows to follow the potentiostatic and potentiodynamic (I,E) curves evolutions in their integrality. A specific study on the electrochemical behavior of titanium leads to a model on the reaction mechanism and the limits of use of this material as a plant reactor material for supercritical water oxidation (SCWO).