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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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医用Mg-Ca和Mg-Li-Ca合金腐蚀研究
DOI: 10.3724/SP.J.1037.2011.00325, PP. 1477-1482
Keywords: Mg-Li-Ca合金,生物材料,腐蚀,模拟人体体液,极化
Abstract:
通过失重法、析氢实验、pH值测定和动电位电化学测试等方法,研究了挤压态Mg-0.54Ca和Mg-1.33Li-0.6Ca合金在模拟体液中的腐蚀降解行为,并利用OM和SEM对合金显微组织及腐蚀形貌进行了观察,采用XRD对基体及腐蚀产物的相结构进行分析.结果表明,Mg-1.33Li-0.6Ca合金的组织由α-Mg基体和Mg2Ca及CaLi2第二相组成,而Mg-0.54Ca合金的组织由α-Mg基体和第二相Mg2Ca组成;Mg-1.33Li-0.6Ca合金在Hank's溶液中浸泡初期的耐蚀性能略低于Mg-0.54Ca合金,随着浸泡时间的延长,其耐蚀性能明显优于Mg-0.54Ca合金,主要原因是Li提高了Mg-1.33Li-0.6Ca合金腐蚀产物的致密性;Mg-1.33Li-0.6Ca合金的腐蚀产物为LiH,Mg(OH)2,MgCO3,CaCO3,CaMgCO3和CaMgPO4,而Mg-0.54Ca合金腐蚀产物为MgCO3,CaCO3和CaMgPO4.Mg-0.54Ca和Mg-1.33Li-0.6Ca合金在模拟体液中的腐蚀类型都为点蚀和丝状腐蚀.
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