Ti6Al4V titanium alloy has been widely used as medical implant material in orthopedic\nsurgery, and one of the obstacles preventing it from wide use is toxic metal ions release and\nbacterial implant infection. In this paper, in order to improve corrosion resistance and antibacterial\nperformance of Ti6Al4V titanium alloy, ZnO doped tantalum oxide (TaxOy) multilayer composite\ncoating ZnO-TaxOy/TaxOy/TaxOy-TiO2/TiO2/Ti (ZnO-TaxOy) was deposited by magnetron sputtering\nat room temperature. As a comparison, monolayer TaxOy coating was prepared on the surface\nof Ti6Al4V alloy. The morphology and phase composition of the coatings were investigated by\nfield emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD), the elemental\nchemical states of coating surfaces were investigated by X-ray photoelectron spectroscope (XPS).\nThe adhesion strength and corrosion resistance of the coatings were examined by micro-scratch\ntester and electrochemical workstations, respectively. The results show that the adhesion strength\nof multilayer ZnO-TaxOy coating is 16.37 times higher than that of single-layer TaxOy coating.\nThe ZnO-TaxOy composite coating has higher corrosion potential and lower corrosion current density\nthan that of TaxOy coating, showing better corrosion inhibition. Furthermore, antibacterial test\nrevealed that multilayer ZnO-TaxOy coating has a much better antibacterial performance by contrast.
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