Çaha, İhsanAlves, Alexandra C.Chirico, CaterinaMaria Pinto, AnaTsipas, SophiaGordo, ElenaBondarchuk, OleksandrLeonard Deepak, FrancisToptan, Fatih2023-02-052023-02-0520230169-4332https://doi.org/10.1016/j.apsusc.2022.156282https://hdl.handle.net/11147/12918This 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. © 2022 Elsevier B.V.eninfo:eu-repo/semantics/closedAccessCorrosionEISPassive filmTEMXPSBinary alloysElectrochemical corrosionElectrolytesNiobium alloysTitanium dioxideArticle2-s2.0-8514578342110.1016/j.apsusc.2022.156282