Corrosion of titanium alloys in pressurised water at 300 °C: Kinetics and modelling. (September 2021)

• Record Type: Journal Article
• Authors: Selva, Sabrina; Bignon, Quentin; Raynal, Amandine; Martin, Frantz; Auzoux, Quentin; Renou, Gilles; Tabarant, Michel; Miserque, Frédéric; Latu-Romain, Laurence; Wouters, Yves
• Is Part Of: Corrosion science. Volume 190(2021)
• Publication Date: 2021-09
• Subjects: Titanium -- Corrosion -- Anatase -- Rutile -- Ilmenite -- Pressurised water; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.109646
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: The nanoscale TiO2 layer was covered by anatase and ilmenite crystallites. The thin TiO2 layer evolution was modelled by a Loriers-Haycock model. Titanium and ilmenite precipitation ratii were defined and measured. A phenomenological model was proposed to link mass variation to corrosion rate. Corrosion rates of all studied materials stand between 2 and 6.6 μm/year at 300 °C. Abstract: The corrosion of titanium alloys in primary water at 300 °C led to a global weight gain due to oxidation and surface precipitation, despite some dissolution. A model was proposed, taking into account the weight contribution of each oxide type to the global mass evolution with exposure time. Based on this model, on mass variation and GD-OES results, a corrosion rate ranging between 2 and 6.6 μm.year -1 at 300 °C for all tested materials was estimated. Due to the simultaneous corrosion of the used stainless steel reactors, a protective ilmenite layer finally precipitated at the surface of the samples.