Abstract
Ti6Al4V titanium alloy has been widely used as medical implant material in orthopedic surgery, and one of the obstacles preventing it from wide use is toxic metal ions release and bacterial implant infection. In this paper, in order to improve corrosion resistance and antibacterial performance of Ti6Al4V titanium alloy, ZnO doped tantalum oxide (TaxOy) multilayer composite coating ZnO-TaxOy/TaxOy/TaxOy-TiO2/TiO2/Ti (ZnO-TaxOy) was deposited by magnetron sputtering at room temperature. As a comparison, monolayer TaxOy coating was prepared on the surface of Ti6Al4V alloy. The morphology and phase composition of the coatings were investigated by field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD), the elemental chemical states of coating surfaces were investigated by X-ray photoelectron spectroscope (XPS). The adhesion strength and corrosion resistance of the coatings were examined by micro-scratch tester and electrochemical workstations, respectively. The results show that the adhesion strength of multilayer ZnO-TaxOy coating is 16.37 times higher than that of single-layer TaxOy coating. The ZnO-TaxOy composite coating has higher corrosion potential and lower corrosion current density than that of TaxOy coating, showing better corrosion inhibition. Furthermore, antibacterial test revealed that multilayer ZnO-TaxOy coating has a much better antibacterial performance by contrast.
Highlights
Ti6A14V titanium alloy, as a kind of ideal biomedical material, has been widely used in tooth implant, bone trauma products, artificial joints and other hard tissue substitutes or prostheses due to its excellent properties, such as biocompatibility, acceptable corrosion resistance, and comprehensive mechanical properties [1,2,3]
Since the corrosion behavior and bacterial infection of Ti6Al4V alloy are related to its surface properties, these features can be customized by surface coatings
The electrochemical characteristics of the samples were detected with electrochemical workstation (SP-15/20A, Bio-Logic Science Instruments, Seyssinet-Pariset, France) with a conventional three-electrode system in which platinum sheet was used as the counter electrode (CE), a saturated Ag/AgCl electrode as the reference electrode (RE) and the samples as the working electrode (WE)
Summary
Ti6A14V titanium alloy, as a kind of ideal biomedical material, has been widely used in tooth implant, bone trauma products, artificial joints and other hard tissue substitutes or prostheses due to its excellent properties, such as biocompatibility, acceptable corrosion resistance, and comprehensive mechanical properties [1,2,3]. Various inorganic coatings such as TiO2, Al2O3, SiO2, ZrO, Ta2O5, DLC, and HA have been used for surface modification of Ti6Al4V alloys, and their corrosion properties in vitro have been investigated [11,12,13,14,15,16,17] Among these coatings, tantalum oxide (TaxOy) film has recently attracted much attention due to its advantages such as excellent corrosion resistance, good biocompatibility, and good wear resistance, as well as its ability to inhibit the growth of bacteria [18,19,20,21]. By understanding the microstructure and properties of ZnO-TaxOy composite multilayer coatings, our work is expected to provide a valuable reference for biomedical applications of this novel coating
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