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

publication date

  • April 2023

start page

  • 1

end page

  • 10


  • 156282


  • 615

International Standard Serial Number (ISSN)

  • 0169-4332

Electronic International Standard Serial Number (EISSN)

  • 1873-5584


  • 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.


  • Chemistry
  • Materials science and engineering


  • passive film; corrosion; ti-nb alloys; eis; xps; tem