Evaluation of corrosion resistance of implant-use Ti-Zr binary alloys with a range of compositions
Evaluation of corrosion resistance of implant-use Ti-Zr binary alloys with a range of compositions
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DOI：
10.1002/jbm.b.33811
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发表时间：
2018-01-01
影响因子：
3.4
通讯作者：
Wakabayashi, Noriyuki
中科院分区：
文献类型：
--
作者：
Akimoto, Teisuke;Ueno, Takeshi;Wakabayashi, Noriyuki
虽然钛-锆合金已在临床上得到应用，但目前还没有确定钛-锆合金中的理想比例。在本研究中，我们通过评估钛-锆合金的耐腐蚀性来研究其生物相容性，以更好地了解该合金中是否存在一个最佳的含锆量范围或值。我们制备了纯Ti、Ti-30Zr、Ti-50Zr、Ti-70Zr和纯Zr(含Zr的摩尔百分比)样品，并对它们进行了阳极极化和在乳酸+氯化钠(NaC L)溶液和人工唾液中的浸泡试验。在这两种溶液中，我们观察到了钛合金和钛合金表面的点蚀现象。浸泡试验后发现，纯钛在乳酸+氯化钠溶液中的溶解程度最大，添加Zr显著降低了钛离子的溶解，在Ti-30Zr的情况下，最终降低了90%以上。因此，虽然在恶劣条件下的局部耐腐蚀性在含锆量大于70%时有所降低，但由于添加了锆使金属离子释放减少，并相应地形成了稳定的钝化层。结果表明，Ti-30Zr或低于50%的Zr含量可为临床应用提供理想的耐蚀性能。(C)2016 Wiley期刊，Inc.生物材料资源B部分：APPL Biomater，106B：73-79,2018。
Although titanium-zirconium (Ti-Zr) alloy has been adopted for clinical applications, the ideal proportion of Zr in the alloy has not been identified. In this study, we investigated the biocompatibility of Ti-Zr alloy by evaluating its corrosion resistance to better understand whether there is an optimal range or value of Zr proportion in the alloy. We prepared pure Ti, Ti-30Zr, Ti-50Zr, Ti-70Zr, and pure Zr (mol% of Zr) samples and subjected them to anodic polarization and immersion tests in a lactic acid+sodium chloride (NaCl) solution and artificial saliva. We observed pitting corrosion in the Ti-70Zr and Zr after exposure to both solutions. After the immersion test, we found that pure Ti exhibited the greatest degree of dissolution in the lactic acid+NaCl solution, with the addition of Zr dramatically reducing Ti ion dissolution, with the reduction ultimately exceeding 90% in the case of the Ti-30Zr. Hence, although the localized corrosion resistance under severe conditions was compromised when the Zr content was more than 70%, metal ion release reduced owing to Zr addition and the corresponding formation of a stable passive layer. The results suggest that Ti-30Zr or a Zr proportion of less than 50% would offer an ideal level of corrosion resistance for clinical applications. (c) 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 73-79, 2018.