Abstract
In this paper, the various grain sizes of Ni 50.5Ti 49.5 and Ni 45.6Ti 49.3Al 5.1 film were prepared by various annealing temperatures. The electrochemical corrosion behavior of smaller grain size Ni 50.5Ti 49.5 and Ni 45.6Ti 49.3Al 5.1 films compared with coarse-grained coatings in chloride-containing corrosion media were characterized using potentiodynamic polarization test, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Results showed that in the chloride-containing electrolyte, the smaller grain size Ni 50.5Ti 49.5 and Ni 45.6Ti 49.3Al 5.1 exhibited improved corrosion resistance when compared with coarse grain films, which is attributed to the higher grain boundary density in fine structure to quickly form a noble and protective passive film. The enhancement of corrosion resistance can be related to the positive effect of the high fraction density of grain boundary in fine structure materials.
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