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为改善生物医用钛合金的表面性能及植入人体后的耐腐蚀性能,利用双层辉光等离子技术在近β钛合金TLM表面进行渗氮处理。通过金相显微镜、X射线衍射仪、显微硬度仪、电子显微镜及电化学工作站研究渗氮后TLM钛合金的截面金相、相结构、显微硬度及表面改性前后TLM钛合金在人工模拟体液(hank’s溶液)中的电化学腐蚀性能。结果表明:近β型钛合金TLM表面渗氮处理后,可得到一层致密、均匀的改性层,厚度约4~5μm。其主要成分为Ti_2N和Ti-cubic,显微硬度由(238±10)提升至(874±10)HV;电化学腐蚀实验中渗氮改性层的E_(corr)从-0.5923上升至-0.4904 V,I_(corr)由3.653×10~(-7)降低至8.742×10~(-8)/cm~2,交流阻抗值显著增大,表明TLM钛合金表面渗氮改性处理可以提升其在人工模拟体液中的耐腐蚀性能。
In order to improve the surface properties of biomedical titanium alloy and the corrosion resistance after implantation into the human body, nitriding treatment was performed on the surface of near-Ti alloy TLM by double glow plasma technique. The microstructure, microstructure and microhardness of TLM titanium alloy before and after nitriding were studied by metallographic microscope, X-ray diffraction, microhardness tester, electron microscope and electrochemical workstation. Electrochemical corrosion behavior in body fluids (hank’s solution). The results show that a dense and uniform modified layer can be obtained after nitriding treatment on the surface of nearly β-type titanium alloy. The thickness is about 4 ~ 5μm. The main composition of TiN was Ti 2 N and Ti-cubic, and the microhardness increased from (238 ± 10) to (874 ± 10) HV. The corr of the nitriding modified layer increased from -0.5923 to -0.4904 V and I corr decreased from 3.653 × 10 -7 to 8.742 × 10 -8 / cm 2, the AC impedance increased significantly, which indicated that the nitriding treatment on TLM titanium alloy could be improved Corrosion resistance in artificial simulated body fluids.