超声场下磷化时间对NiTi合金表面磷化膜形貌及性能的影响

发布时间：2019-05-13 22:11

【摘要】：目的通过表面改性处理来减小镍离子溢出对人体产生的危害,同时提高其力学及生物性能。方法采用超声磷化技术在镍钛合金表面制备磷化膜,研究磷化时间对NiTi合金表面磷化膜形貌及性能的影响,借助扫描电子显微镜(SEM)、X射线衍射仪(XRD)、能谱仪(EDS)、摩擦磨损仪及电化学工作站等仪器对表层的形貌、结构、成分、耐腐蚀性、耐磨性、生物活性进行表征。结果超声磷化最优磷化时间为1 h,生成的磷化膜均匀、致密、完整,呈细小短棒状,其厚度约为17.5μm,自腐蚀电位由基材的-0.72 V提高到-0.3229 V,自腐蚀电流密度下降了2个数量级,摩擦系数稳定在0.12左右,相比于基材的0.50,降低了很多。磷化膜浸泡在SBF中30天后,成功吸附了细小、均匀、致密的类羟基磷灰石。结论超声磷化处理能明显改善镍钛合金的耐蚀性能、耐磨性能以及生物性能。
[Abstract]:Objective to reduce the harm of nickel ion spillover to human body by surface modification, and to improve its mechanical and biological properties. Methods the phosphating film was prepared on the surface of nickel-titanium alloy by ultrasonic phosphating technology. the effect of phosphating time on the morphology and properties of the phosphating film on the surface of NiTi alloy was studied. The scanning electron microscope (SEM), X-ray diffractometer (XRD), energy dispersive spectrometer (EDS),) was used. The morphology, structure, composition, corrosion resistance, wear resistance and biological activity of the surface layer were characterized by friction wear meter and electrochemical workstation. Results the optimum phosphating time of ultrasonic phosphating was 1 hour. The phosphating film was uniform, dense, complete and small rod shape. The thickness of the film was about 17.5 渭 m, and the self-corrosion potential was increased from-0.72V to-0.3229 V. The self-corrosion current density decreases by two orders of magnitude, and the friction coefficient is stable at about 0.12. compared with 0.50 of the substrate, the friction coefficient is much lower. After soaking in SBF for 30 days, the phosphating film successfully adsorbed fine, uniform and dense hydroxyapatite. Conclusion Ultrasonic phosphating treatment can obviously improve the corrosion resistance, wear resistance and biological properties of Ni-Ti alloy.
【作者单位】：江苏大学;
【基金】：国家自然科学基金项目(50772044) 江苏省介入医疗器械研究重点实验室开放基金项目(JR1106)~~
【分类号】：TG174.4

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