Atomic-scale investigations of passive film formation on Ti-Nb alloys

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This study extensively investigates the passive film formation mechanisms on Ti-xNb alloys by using several electrochemical techniques, including electrochemical impedance spectroscopy (EIS) before and after potentiostatic polarization at the passive zone, and Mott-Schottky (MS) measurements in 9 g/l NaCl electrolyte at 37 °C, together with X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) analysis. Overall, the Ti40Nb presented lower corrosion resistance due to a thinner passive film as compared to commercial pure Ti (grade 2) and Ti12Nb. The passive film formed on Ti12Nb and Ti40Nb alloys at a steady-state condition (+0.5 VAg/AgCl for 60 min) is composed of amorphous phases of TiO, Ti2O3, TiO2, Nb2O5, and crystalline phases of TiO2 (anatase) and Nb2O5.
Passive film, Corrosion, Ti-Nb alloys, EIS, XPS, TEM
Bibliographic citation
Çaha, I., Alves, A. C., Chirico, C., Maria Pinto, A., Tsipas, S., Gordo, E., Bondarchuk, O., Leonard Deepak, F. & Toptan, F. (2023). Atomic–scale investigations of passive film formation on Ti-Nb alloys. Applied Surface Science, 615, 156282.