【摘 要】
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Magnesium alloys have attracted more and more attention to be used in biomedical implants due to their good mechanical properties, low density and degradable properties. However, for those devices, th
【机 构】
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Corrosion and Protection Center, Key Laboratory for Environmental Fracture (MOE), Institute of Advan
【出 处】
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第十一届全国表面工程大会暨第八届全国青年表面工程学术会议
论文部分内容阅读
Magnesium alloys have attracted more and more attention to be used in biomedical implants due to their good mechanical properties, low density and degradable properties. However, for those devices, they sometimes operate in tribological contacts. The material degradation rates are much higher under such conditions than in static conditions. The acceleration is due to the interaction between wear and corrosion. Moreover, the operating environment for such devices is rich in proteins and other biological species. The mechanisms of material degradation are very complex. A Mg-Fe-Si alloy was studied under simulated conditions. The adsorption of proteins on the surface of tested material was studied by using AFM and EIS. The interaction of tribology and corrosion was studied by using a reciprocating pin-on-plate wear tester. The surface was analyzed by the AES and XPS. Negative synergy effect was found for this alloy. A dense tribofilm could be formed at the contacted area which protected and lubricated the worn surface. The tribofilm consists of mainly magnesium oxides and hydroxides and denatured proteins.
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