1 School of Mechanical Engineering, Shandong University of Technology, Zibo 255049, Shandong, China 2 Shandong Provincial Key Laboratory of Precision Manufacturing and Non-traditional Machining, Zibo 255049, Shandong, China
Abstract: In view of the problem that NiTi alloy is corroded and releases a large amount of nickel ions under the complex physiological environment in the body, ZnO nanoparticles were added to the electrolyte with NaAlO2, C10H14N2Na2O8 and Na2HPO4·12H2O as the main components, a corrosion-resistant ceramic oxide film was fabricated on the surface of nickel titanium alloy using micro arc oxidation technology. Pareto’s law and normal distribution curve were introduced to analyze the effects of ZnO nanoparticles on the porosity and pore size of MAO film. Moreover, the effects of ZnO nanoparticles on the surface morphology, composition, phase structure, corrosion resistance and wettability of the film were investigated by SEM, EDS, electrochemical workstation, and water contact angle. The results show that MAO film doped with ZnO nanoparticles is more smooth and compact, the porosity decreases by 65.3%, the average pore size decreases from 0.518 μm to 0.321 μm. With the doping of nanoparticle ZnO, the amount of O, Al and Zn elements on the surface of the film increases, while the Ni element decreases. Furthermore, after doping, the surface resistance modulus of the composite film increases, the dynamic potential polarization curve shifts to the left, the self-corrosion potential increases by 32.4%, and the current density decreases by an order of magnitude.
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2024, Vol. 38 
