Martin Edith, Manceur Aziza, Polizu Stéfania, Savadogo Oumarou, Wu Ming H, Yahia L'Hocine
Groupe de Recherche en Biomécanique/Biomatériaux, Ecole Polytechnique de Montréal, C.P. 6079, Succ. cv, Mtl (QC) H3C 3A7, Canada.
Biomed Mater Eng. 2006;16(3):171-82.
The beta-titanium alloy, a particular type of titanium, has been investigated as a biomaterial because of its good mechanical performances and its high corrosion resistance and biocompatibility. This work focuses on the corrosion performance of a beta-titanium alloy of composition Ti-11Mo-2V-4Nb-3Al in Hank's physiological solution. Potentiodynamic tests were performed from -0.25 V to 3.5 V; the breakdown potential was not reached. To observe the behaviour of the alloy while submitted to long-term aggressive conditions, 1, 4 and 8 cycles of cyclic polarization were carried out. Results show a high resistance of the alloy to corrosion and a stabilization of the surface after several corrosion cycles. Pitting was not observed and a fast ability of the surface to repassivate was noticed. The surface was characterized by different techniques before and after corrosion testing. Following the corrosion tests, X-ray Photoelectron Spectroscopy (XPS) showed the presence of calcium and phosphorus, an increase of the oxide layer was measured by Auger Electron Spectroscopy (AES), a relatively smooth surface was visualised by Scanning Electron Microscopy (SEM) and contact-angle measurements showed that the surface energy increased.
β钛合金是钛的一种特殊类型，因其良好的机械性能、高耐腐蚀性和生物相容性而被作为生物材料进行研究。这项工作聚焦于Ti-11Mo-2V-4Nb-3Al成分的β钛合金在汉克氏生理溶液中的腐蚀性能。进行了从-0.25 V到3.5 V的动电位测试；未达到击穿电位。为了观察该合金在长期侵蚀条件下的行为，进行了1、4和8个循环极化周期。结果表明该合金具有高耐腐蚀性，并且在经过几次腐蚀循环后表面趋于稳定。未观察到点蚀，且注意到表面具有快速再钝化的能力。在腐蚀测试前后用不同技术对表面进行了表征。腐蚀测试后，X射线光电子能谱（XPS）显示存在钙和磷，俄歇电子能谱（AES）测量出氧化层增加，扫描电子显微镜（SEM）观察到表面相对光滑，接触角测量表明表面能增加。
