Abstract
Ti-Ni implants were coated with oxide film to suppress dissolution of Ni, and the corrosion resistance was estimated by means of anodic polarization measurement in 1% NaCl solution.By coating, dissolution at low potential was suppressed and the dissolute current density decreased.A further decrease in current density, which results from stabilization of the passive state on the surface, was observed by repeated polarization.In addition, the oxide film showed close adhesion with matrix, and did not form cracks or peel off by plastic deformation associated with the shape memory effect.The surface was scratched to simulate accidental break in coating film, and polarization measurement was carried out.However, no dissolution at low potential was observed, and a stable surface was maintained.
