Khan M A, Williams R L, Williams D F
Department of Clinical Engineering, Faculty of Medicine, University of Liverpool, UK.
Biomaterials. 1996 Nov;17(22):2117-26. doi: 10.1016/0142-9612(96)00029-4.
Cyclic anodic polarization studies were undertaken for several titanium alloys of varying composition and phase structures. All materials were exposed to an accelerated corrosion test using a potentiostat and their electrochemical behaviour was analysed within a potential range of 0 to 5000 mV. The electrolyte used was a phosphate buffered saline (PBS) solution at pH = 5, 7.4 and 9. The polarization curves obtained represented both the passive and active regions of the materials and these curves were used to compare the resistance to pitting corrosion of each material. The sliding-wear of these materials was studied in both non-corrosive and corrosive environments. A simple pin-on-disc type wear apparatus was designed and built to simulate the co-joint action of corrosion and sliding-wear. Using this apparatus, it was also possible to evaluate the effect of wear-accelerated corrosion, which was also evaluated by wearing the surface of the specimens prior to corrosion. It was evident that the mixed phase alpha-beta alloys (Ti-6AI-4V and Ti-6AI-7Nb) possessed the best combination of both corrosion and wear resistance, although commercially pure titanium and the near-beta (Ti-13Nb-13Zr) and beta (Ti-15Mo) alloys displayed the best corrosion resistant properties.
对几种成分和相结构不同的钛合金进行了循环阳极极化研究。所有材料都使用恒电位仪进行加速腐蚀试验，并在0至5000 mV的电位范围内分析其电化学行为。使用的电解质是pH值为5、7.4和9的磷酸盐缓冲盐水（PBS）溶液。获得的极化曲线代表了材料的钝化区和活性区，这些曲线用于比较每种材料的耐点蚀性。研究了这些材料在非腐蚀性和腐蚀性环境中的滑动磨损。设计并制造了一种简单的销盘式磨损装置，以模拟腐蚀和滑动磨损的共同作用。使用该装置，还可以评估磨损加速腐蚀的影响，这也通过在腐蚀前磨损试样表面来评估。很明显，混合相α-β合金（Ti-6Al-4V和Ti-6Al-7Nb）具有最佳的耐腐蚀性和耐磨性组合，尽管商业纯钛以及近β（Ti-13Nb-13Zr）和β（Ti-15Mo）合金表现出最佳的耐腐蚀性能。
