Chemistry and Life Science School, Anshan Normal University, 43 Pingan street, Anshan, 114016, China.
Mater Sci Eng C Mater Biol Appl. 2013 May 1;33(4):2159-67. doi: 10.1016/j.msec.2013.01.036. Epub 2013 Jan 24.
Corrosion behavior of a multifunctional biomedical titanium alloy Ti-24Nb-4Zr-8Sn (wt.%) in 0.9% NaCl, Hank's solution and artificial saliva at 37 °C was investigated using open circuit potential, impedance spectroscopy and potentiodynamic polarization techniques, and some results were compared with pure titanium and Ti-6Al-4V alloy. The results showed that the alloy exhibited good corrosion resistance due to the formation of a protective passive film consisting mainly of TiO2 and Nb2O5, and a little of ZrO2 and SnO2. Ca ions were detected in the passive film as the alloy immersed in Hank's and artificial saliva solutions and they have negative effect on corrosion resistance. The EIS results indicated that either a duplex film with an inner barrier layer and an outer porous layer or a single passive layer was formed on the surface, and they all transformed into stable bilayer structure as the immersion time increased up to 24h. The polarization curves demonstrated that the alloy had a wider passive region than pure titanium and Ti-6Al-4V alloy and its corrosion current density (less than 0.1 μA/cm(2)) is comparable to that of pure titanium.
研究了 Ti-24Nb-4Zr-8Sn（wt.%）多功能生物医用钛合金在 37°C 下的 0.9%NaCl、Hank's 溶液和人工唾液中的腐蚀行为，采用开路电位、阻抗谱和动电位极化技术进行了研究，并将一些结果与纯钛和 Ti-6Al-4V 合金进行了比较。结果表明，由于形成了主要由 TiO2 和 Nb2O5 以及少量 ZrO2 和 SnO2 组成的保护性钝化膜，该合金表现出良好的耐腐蚀性。当合金浸入 Hank's 和人工唾液溶液中时，在钝化膜中检测到 Ca 离子，它们对耐腐蚀性有负面影响。EIS 结果表明，无论是内层阻挡层和外层多孔层的双层膜还是单层钝化膜，在浸泡 24 小时后，它们都会转化为稳定的双层结构。极化曲线表明，该合金的钝化区比纯钛和 Ti-6Al-4V 合金宽，其腐蚀电流密度（小于 0.1 μA/cm2）与纯钛相当。
