An investigation on the biotribocorrosion behaviour of CoCrMo alloy grafted with polyelectrolyte brush.
An investigation on the biotribocorrosion behaviour of CoCrMo alloy grafted with polyelectrolyte brush.
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DOI：
10.3233/bme-141026
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发表时间：
2014
影响因子：
1
通讯作者：
Hong-yu Zhang;Yu-Jiao Zhu;Xiang-yu Hu;Yanfei Sun;Yu-Long Sun;Jian-Min Han;Yu Yan;M. Zhou
中科院分区：
文献类型：
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作者：
Hong-yu Zhang;Yu-Jiao Zhu;Xiang-yu Hu;Yanfei Sun;Yu-Long Sun;Jian-Min Han;Yu Yan;M. Zhou
据报道，在髋关节植入物材料上表面接枝骨刷，如甲基丙烯酸3-磺丙酯钾盐（SPMK），可减少骨科关节面的磨损。然而，SPMK电刷的生物摩擦腐蚀行为在以前的研究中没有被考虑在内。采用光致聚合法将SPMK接枝到Co28 Cr 6 Mo合金表面，利用万能材料试验机和电化学测试系统（三电极）研究了SPMK的生物摩擦腐蚀行为。接触副采用Co28 Cr 6 Mo合金盘和聚乙烯（PE）针，润滑剂为0.9%生理盐水（NaCl）和0.9%生理盐水加25%牛血清白蛋白（BSA）。结果表明，SPMK成功地接枝到了Co28 Cr 6 Mo合金表面，并通过对比表面改性前后样品的拉曼光谱和静态接触角证实了这一点。电化学参数如腐蚀电流和点蚀电位的大幅降低表明，经SPMK接枝后，Co28 Cr 6 Mo合金的腐蚀速率显著降低。此外，在往复滑动下进行的摩擦-电化学耦合测量表明，SPMK接枝的Co28 Cr 6 Mo盘获得最低的腐蚀电流，其中0.9%NaCl与25%BSA耦合作为电解质。研究表明，SPMK电刷镀可显著提高Co28 Cr 6 Mo合金的抗生物摩擦腐蚀性能，在髋关节植入材料的表面改性方面具有潜在的应用前景。
Surface grafting of polyelectrolyte brush, such as 3-sulfopropyl methacrylate potassium salt (SPMK), on hip implant materials has been reported to reduce the wear of the orthopaedic bearing surface. However, the biotribocorrosion behaviour of the SPMK brush has not been taken into consideration in previous research. In the present study, SPMK was grafted on Co28Cr6Mo alloy through photo-induced polymerization, and the biotribocorrosion behaviour was investigated by a series of frictional-electrochemical tests using a universal materials tester combined with an electrochemical measurement (three-electrode) system. Co28Cr6Mo disk and polyethylene (PE) pin were used as the contact pair, and the lubricants were 0.9% saline solution (NaCl) and 0.9% saline solution coupled with 25% bovine serum albumin (BSA). The results showed that SPMK was successfully grafted on Co28Cr6Mo alloy, which was confirmed by the comparison of Raman spectroscopy and static contact angle of the samples before and after surface modification. The greatly reduced electrochemical parameters such as corrosion current and pitting potential indicated that the corrosion rate of Co28Cr6Mo alloy was significantly reduced following SPMK grafting. Additionally, the frictional-electrochemical coupled measurement performed under reciprocating sliding demonstrated that the lowest corrosion current was obtained for the SPMK-grafted Co28Cr6Mo disk, with 0.9% NaCl coupled with 25% BSA as the electrolyte. It is indicated from the present study that SPMK polyelectrolyte brush can greatly improve the anti-biotribocorrosion properties of Co28Cr6Mo alloy, and thus has potential application on surface modification of hip implant materials.