Effect of nano alumina addition on the corrosion behavior of NiTi

In this study, NiTi and NiTi-6 wt.% nano alumina composites were prepared with hot isostatic pressing method. The electrochemical corrosion behavior of NiTi compared with NiTi-6 wt.% nano Al2O3 in simulated body fluid (SBF) corrosion media were characterized using potentiodynamic polarization method. Results showed that in SBF electrolyte, the composite samples showed improved corrosion when compared with unreinforced NiTi samples, which is attributed to the finer grain size of composite samples which facilitate the formation of protective passive layer.