摘要
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 10-15μm 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(<4μm).The NaF concentration had a small effect on the phase transition from metastable anatase phase to stable rutile phase,but greatly affected the corrosion resistance.In general,as the NaF concentration increased,the surface roughness,phase(anatase and rutile)contents,corrosion resistance,and thickness of the coating first increased and then decreased,reaching the maximum values at 0.25 mol/L NaF.
为了提高钛合金的骨整合性和抗菌活性,在NaF电解液中对Ti6Al4V合金进行等离子体电解氧化(PEO)处理,制备含抗菌F元素的微/纳米结构陶瓷涂层。采用扫描/透射电子显微镜、能谱仪、原子力显微镜、X射线衍射仪和动电位极化等手段,研究NaF浓度(0.15~0.50 mol/L)对PEO工艺、涂层的显微组织、相组成、耐蚀性和厚度的影响。结果表明,在NaF电解液中Ti6Al4V合金的PEO电压低(低于200 V),且随着NaF浓度的增加,PEO电压进一步降低。在NaF电解液中形成具有孔径分别为10~15μm和200~800 nm的微/纳结构涂层,该涂层的形貌与在其他电解液中形成的典型饼状结构不同。在Na F电解液中形成的涂层局部表面粗糙度很小,厚度较薄(<4μm)。NaF浓度对从亚稳态锐钛矿相向稳定金红石相转变的影响较小,但对涂层耐蚀性影响较大。总的来说,随着NaF浓度的增加,涂层的表面粗糙度、锐钛矿和金红石含量、耐蚀性和厚度先增大后减小,NaF浓度为0.25 mol/L时达到最大值。
作者
Da-jun ZHAI
Ke-qin FENG
翟大军;冯可芹(四川大学机械工程学院,成都610065;四川工程职业技术学院材料工程系,德阳618000;四川省航空材料检测与模锻工艺技术工程实验室,德阳618000)
作者简介
Corresponding author:Ke-qin FENG;Tel:+86-13628058806;E-mail:kqfeng@scu.edu.cn。
