Effects of proteins on the structure and protectiveness of passive film formed on the Ni-Ti alloy in a simulated physiological solution

Abstract

The structure and protectiveness of the passive film formed on Ni-Ti alloy in Hanks solution containing proteins were investigated by X-ray photoelectron spectroscopy and electrochemical techniques. The protein molecules quickly adsorbed on the Ni-Ti alloy surface and a lot of defects were intriduced in the passive film aged and grown on the Ni-Ti alloy, which resulted in a decreased protectiveness of the passive film.