| 引用本文: | 邓婉蓉,杨巍,李珂珂,王力群,杨得草,赵晨.钛合金表面掺Sn微弧氧化层的制备及其在模拟体液环境中的防护性能[J].中国表面工程,2024,37(5):288~295 |
| DENG Wanrong,YANG Wei,LI Keke,WANG Liqun,YANG Decao,ZHAO Chen.Preparation of Sn-doped Micro-arc Oxide Coating on Titanium Alloy and its Protective Properties in Simulated Body Fluid Environment[J].China Surface Engineering,2024,37(5):288~295 |
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| 摘要: |
| TC4 钛合金植入人体后感染风险高，为提高 TC4 钛合金在模拟体液中的防护性能，通过改变电解液中 Na2SnO3浓度， 在钛合金表面制备掺锡微弧氧化层。利用扫描电子显微镜（SEM+EDS）、X 射线衍射仪（XRD）和 X 射线光电子能谱（XPS） 对微弧氧化层的微观形貌、物相组成和成分进行表征，通过摩擦磨损试验，电化学及抗菌测试研究微弧氧化层在模拟体液 （SBF）中的耐磨性、耐蚀性和抗菌性。结果表明，添加 Na2SnO3 后微弧氧化层表面孔洞数量增多，随着 Na2SnO3 浓度增加， 微弧氧化层表面微孔数量减少直至消失，出现了小颗粒物且膜层越来越致密均匀。Na2SnO3浓度为 10 g / L 时制备的掺锡微弧氧化层在模拟体液中表现出最佳的耐磨性和抗菌性，但该微弧氧化层没有改善基体的耐蚀性，这可能是 SnO2 比 TiO2的耐蚀性低所导致的。研究结果可为钛合金在生物医疗领域的应用提供一定的试验支撑。 |
| 关键词: 钛合金 微弧氧化 防腐耐磨性 抗菌性 |
| DOI：10.11933/j.issn.1007-9289.20230920002 |
| 分类号:TG174 |
| 基金项目:国家自然科学基金面上项目（52071252）；陕西省重点产业链项目（2021ZDLSF03-11） |
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| Preparation of Sn-doped Micro-arc Oxide Coating on Titanium Alloy and its Protective Properties in Simulated Body Fluid Environment |
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DENG Wanrong1，YANG Wei1，LI Keke1，WANG Liqun2，YANG Decao1，ZHAO Chen3
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1.School of Material Science and Chemical Engineering, Xi’ an Technological University, Xi’ an 710021 , China ；2.Physics Teaching Experimental Center, Xi’ an Jiaotong University, Xi’ an 710049 , China ；3.School of Electronic Information Engineering, Xi’an Technological University, Xi’ an 710021 , China
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| Abstract: |
| With the dramatic increase in the demand for medical implant materials, the TC4 titanium alloy can be used as a replacement material for bone tissue owing to its excellent biocompatibility and corrosion resistance. However, the TC4 titanium alloy has poor antibacterial properties, and there may be a higher risk of bacterial infection after implantation in the human body. Coatings prepared by micro-arc oxidation technology have excellent binding strength and can reduce the risk of bacterial infection of titanium alloys by doping with antimicrobial elements. To improve the protective properties of the TC4 titanium alloy in simulated body fluids (SBF), a constant-voltage mode was adopted, with a voltage of 450 V, frequency of 800 Hz, duty cycle of 6%, and time of 10 min. An Sn-doped micro-arc oxide coating was prepared on a titanium alloy by varying the concentration of Na2SnO3 in the electrolyte. The microscopic morphology and elemental content distribution of the micro-arc oxide coating were studied using a scanning electron microscope with an attached energy dispersive spectrometer, and the phase compositions and compositions of the micro-arc oxide coatings were characterized by X-ray diffraction and X-ray photoelectron spectroscopy. The wear resistance, corrosion resistance, and antibacterial properties of the micro-arc oxide coating in SBF were studied using friction and wear, electrochemical, and antibacterial tests. The results show that the number of pores on the micro-arc oxide coating surface increases after the addition of Na2SnO3. With an increase in the Na2SnO3 concentration, the number of micropores on the surface of the micro-arc oxide coating decreases until they disappear, small particles appear, and the film becomes increasingly dense and uniform. The main components of the micro-arc oxide coatings are TiO2, SiO2, and SnO2. The friction factor of the micro-arc oxide coating without Na2SnO3 is lower than that of TC4. The friction factor of the Sn-doped micro-arc oxide coating in SBF decreases with an increase in the Na2SnO3 concentration, and the width of the wear mark is narrowed. When the concentration of Na2SnO3 is 10 g / L, the Sn-doped micro-arc oxide coating has the smallest friction factor and the narrowest wear mark width of 198.85 μm, which exhibits the best wear resistance, which may be due to the enrichment of small particles and the lubricating effect. However, the micro-arc oxide coating does not improve the corrosion resistance of the TC4 titanium alloy, which may be caused by the presence of micropores and other defects on the surface of the coating and the lower corrosion resistance of SnO2 than that of TiO2. The antibacterial properties of the micro-arc oxide coating improve after the addition of Na2SnO3; the Sn-doped micro-arc oxide coating prepared at a concentration of Na2SnO3 of 10 g / L and the antibacterial properties of the Sn-doped micro-arc oxide coating are the best in SBF. The optical density value decreases from 0.289 to 0.136 in the Staphylococcus aureus solution and from 0.331 to 0.171 in the Escherichia coli solution, because SnO2 could inhibit the growth of bacteria. These results provide experimental support for the application of titanium alloys in the field of biomedicine. |
| Key words: titanium alloy micro-arc oxidation anti-corrosion and wear resistance antimicrobial |
