Abstract
TiO 2 passive film plays an important role in defining biocompatibility of NiTi shape memory alloy. The corrosion behaviour of Ni 50.8 Ti 49.2 was investigated in 0.9 wt.% aqueous NaCl solution. Grazing incident X-ray diffraction (GIXRD) reveals the formation of a compressive passive film having 2.12% d-spacing variation, noticeably in B19’ structure. The surface topography (undulation) and passive film thickness was recorded in a unique way using atomic force microscopy (AFM). Raman spectrometer and X-ray photoelectron spectroscopy (XPS) investigation confirm the formation of TiO 2 -dominated passive film. Film rupture and breakdown initiation sites were precisely captured by field emission scanning electron microscope (FESEM).
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