Surface Structure of NiTi Alloy Passivated by Autoclaving
Sterilization of the NiTi alloy in boiling water or steam causes passivation, which results in an amorphous 3.5 nm thick TiO2 layer on the surface. Between the surface and the matrix a transition layer of Ni2O3 and NiO was observed, using the X-ray photoelectron spectroscopy. Differences in sterilization conditions affect the amount of metallic nickel on the surface.
Luís Guerra ROSA and Fernanda MARGARIDO
H. Morawiec et al., "Surface Structure of NiTi Alloy Passivated by Autoclaving", Materials Science Forum, Vols. 636-637, pp. 971-976, 2010