摘要:
为使钛基金属适宜人体的植入环境,提高润湿性及耐腐蚀性。以NH4F和乙二醇溶液为电解液,在25 V直流电压下,采用阳极氧化法在钛片表面制备TiO2纳米管,系统研究阳极氧化时间对TiO2纳米管形貌、物相组成、润湿性及耐腐蚀性的影响。利用扫描电子显微镜(SEM)、X射线衍射仪(XRD)表征TiO2纳米管的形貌和物相组成。利用接触角测量仪测试试样的水接触角。利用动电位极化曲线研究试样的耐腐蚀性。结果表明:当氧化时间为2h时,钛表面出现高度有序的TiO2纳米管,孔径范围大约在3040 nm,孔壁厚约为20 nm;钛片与水的接触角较小约为28.8°,润湿性较好;自腐蚀电压为0.145 V,比纯钛提高约34%,自腐蚀电流约为0.468μA/cm2,腐蚀电阻Rp约为1.023×105Ω/cm2,显著提高了耐腐蚀性。
Abstract:
In order to make titanium based metals fit for the implant environment of human body and improve the wettability and corrosion resistance,TiO2 nanotubes were prepared on the surface of titanium by anodic oxidation method at 25 V of DC voltage using NH4F and ethylene glycol as electrolyte.The effects of anodic oxidation time on morphology,phase compositions,wettability and corrosion resistance of TiO2 nanotubes were studied.The morphology and phase compositions of TiO2 nanotubes were characterized by scanning electron microscopy（ SEM） and X-ray diffraction（ XRD）. Distilled water contact angle of the samples was measured by contact angle measuring instrument,and the corrosion resistance of the samples was studied by a potentiodynamic polarization curve method.The results show that when the oxidation time is 2 h,highly ordered TiO2 nanotubes with pore size range of about 30 ~40 nm and pore wall thickness of about 20 nm can be prepared on the titanium surface. Contact angle between the titanium sheet and distilled water is about 28.8° indicating a better wettability.Furthermore,the self-corrosion voltage of titanium with TiO2 nanotubes is 0.145 V,about 34% higher than that of pure titanium. The corrosion current is about 0. 468 μA/cm2,and the corrosion resistance Rpis about 1. 023×105Ω/cm2 for sample with TiO2 nanotubes,significantly improving the corrosion resistance.
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