In vitro corrosion testing of modular hip tapers
In vitro corrosion testing of modular hip tapers
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DOI：
10.1002/jbm.b.10526
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发表时间：
2003-02-15
影响因子：
3.4
通讯作者：
Gilbert, JL
中科院分区：
文献类型：
--
作者：
Goldberg, JR;Gilbert, JL
模拟组配式髋关节假体的体内微动磨损行为，以确定材料组合和独特的TiN/AlN涂层对锥体界面微动磨损和腐蚀的影响。测量微动电流、开路电位（OCP）和可溶性碎屑量，以确定机械辅助缝隙腐蚀对组配式髋关节锥体微动和腐蚀的作用。使用了由相似合金（Co-Cr-Mo股骨头/Co-Cr-Mo股骨颈）、混合合金（Co-Cr-Mo股骨头/Ti-6Al-4V股骨颈）和TiN/AlN涂层混合合金组配式髋关节锥体组合组成的试验组。所有试验组启动微动磨损所需的载荷相似，远低于步行和其他体力活动产生的载荷。在长期循环加载过程中观察到的OCP减少和微动电流增加表明微动和腐蚀。在循环载荷停止后测量的电流表明，一旦缝隙腐蚀的条件建立，腐蚀可以在没有载荷的情况下继续。化学、机械和电化学测量，沿着与锥表面的显微镜检查表明，类似和混合合金锥对的微动磨损和腐蚀行为是相似的，涂层样品更耐微动磨损和腐蚀。本研究的结果清楚地表明了机械载荷在腐蚀过程中的作用，并支持机械辅助缝隙腐蚀的假设。(C)2002 Wiley Periodicals，Inc.
The in vivo fretting behavior of modular hip prostheses was simulated to determine the effects of material combination and a unique TiN/AlN coating on fretting and corrosion at the taper interface. Fretting current, open-circuit potential (OCP), and quantities of soluble debris were measured to determine the role of mechanically assisted crevice corrosion on fretting and corrosion of modular hip tapers. Test groups consisting of similar-alloy (Co-Cr-Mo head/Co-Cr-Mo neck), mixed-alloy (Co-Cr-Mo head/Ti-6Al-4V neck), and TiN/AlN-coated mixed-alloy modular hip taper couples were used. Loads required to initiate fretting were similar for all test groups and were well below loads produced by walking and other physical activities. Decreases in OCP and increases in fretting current observed during long-term cyclic loading were indicative of fretting and corrosion. Current measured after cessation of cyclic loading suggests that once the conditions for crevice corrosion are established, corrosion can continue in the absence of loading. The chemical, mechanical, and electrochemical measurements, along with microscopic inspections of the taper surfaces indicate that the fretting and corrosion behavior of simillar- and mixed-alloy taper couples are similar and that the coated samples are more resistant to fretting and corrosion. The results of this study clearly indicate the role of mechanical loading in the corrosion process, and support the hypothesis of mechanically assisted crevice corrosion. (C) 2002 Wiley Periodicals, Inc.