Abstract
Abstract In order to improve the osseointegration and antibacterial activity of titanium alloys, micro/nano-structured ceramic coatings doped with antibacterial element F were prepared by plasma electrolytic oxidation (PEO) process on Ti6Al4V alloy in NaF electrolyte. The influence of NaF concentration (0.15−0.50 mol/L) on the PEO process, microstructure, phase composition, corrosion resistance and thickness of the coatings was investigated using scanning/transmission electron microscopy, energy dispersive spectroscopy, atomic force microscopy, X-ray diffractometer, and potentiodynamic polarization. The results demonstrated that Ti6Al4V alloy had low PEO voltage (less than 200 V) in NaF electrolyte, which decreased further as the NaF concentration increased. A micro/nano-structured coating with 10−15 μm pits and 200−800 nm pores was formed in NaF electrolyte; the morphology was different from the typical pancake structure obtained with other electrolytes. The coating formed in NaF electrolyte had low surface roughness and was thin (
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