Corrosion of three titanium alloys (T40, TA6V and Ti10-2-3) has been studied in primary water conditions for durations going from 24 h to 3499 h. Oxides formed were observed and analysed by X-ray diffraction (XRD), Raman spectroscopy, Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDS), X-ray Photoelectron Spectroscopy (XPS), Glow Discharge-Optical Emission Spectroscopy (GD-OES), Transmission Electron Microscopy (TEM) ASTAR, Photoelectrochemistry (PEC) and nanoindentation. Influence of chemical composition and microstructure of alloys on corrosion mechanisms has been investigated. Oxides of the three alloys were made of a dense layer and surface crystallites. The dense oxide layer of T40 was made of TiO 2 rutile whereas it consisted of TiO 2 anatase for both TA6V and Ti10-2-3. Surface crystallites of the three alloys were composed of TiO 2 anatase and FeTiO 3 ilmenite. Oxide dissolution and precipitation phenomenon were found to play a key role in the corrosion mechanisms. Oxygen vacancies were identified as the point defect diffusing in the three alloys dense oxide layer. Oxygen penetration inside the alloy below the oxide layer was not observed.
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