医用Mg-Ca和Mg-Li-Ca合金腐蚀研究

曾荣昌; 郭小龙; 刘成龙; 陶武; 刘云逸; 李博文

doi:10.3724/SP.J.1037.2011.00325

金属学报 >

2011 , Vol. 47 >Issue 11: 1477 - 1482

DOI: https://doi.org/10.3724/SP.J.1037.2011.00325

论文

医用Mg-Ca和Mg-Li-Ca合金腐蚀研究

曾荣昌 ,
郭小龙 ,
刘成龙 ,
陶武 ,
刘云逸 ,
李博文

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1) 山东科技大学材料科学与工程学院, 青岛 266590
2) 重庆理工大学材料科学与工程学院, 重庆 400050
3) 中国科学院金属研究所金属腐蚀与防护国家重点实验室, 沈阳 110016

曾荣昌, 男, 1964年生, 教授, 博士

收稿日期: 2011-05-23

修回日期: 2011-07-12

网络出版日期: 2011-11-11

基金资助

山东省自然科学基金项目ZR2011EMM004, 山东省“泰山学者”建设工程专项经费项目和重庆理工大学大学生创新性实验计划项目资助

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STUDY ON CORROSION OF MEDICAL Mg-Ca AND Mg-Li-Ca ALLOYS

ZENG Rong-Chang ,
GUO Xiao-Long ,
LIU Cheng-Long ,
DAO Wu ,
LIU Yun-Yi ,
LI Bo-Wen

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1) College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590
2) School of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400050
3) State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Received date: 2011-05-23

Revised date: 2011-07-12

Online published: 2011-11-11

Supported by

Supported by Natural Science Foundation of Shandong Province (No.ZR2011EMM004), Taishan
Scholarship Project of Shandong Province and Undergraduate Innovational Experimentation Program of Chongqing University of Technology

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摘要

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.

关键词： Mg-Li-Ca合金; 生物材料; 腐蚀; 模拟人体体液; 极化

本文引用格式

曾荣昌 , 郭小龙 , 刘成龙 , 陶武 , 刘云逸 , 李博文 . 医用Mg-Ca和Mg-Li-Ca合金腐蚀研究[J]. 金属学报, 2011 , 47(11) : 1477 -1482 . DOI: 10.3724/SP.J.1037.2011.00325

Abstract

The corrosion behaviors of the extruded Mg-0.54Ca and Mg-1.33Li-0.6Ca alloys in simulated body fluids (SBFs) were investigated using weight loss, hydrogen evolution and pH value measurement as well as dynamic electrochemical technique. The microstructure and corrosion morphology of these alloys were discerned by means of OM and SEM, and their corrosion products were analyzed by XRD. The results show that the microstructure is composed of α-Mg matrix and secondary phases: Mg₂Ca and CaLi₂ for the Mg-1.33Li-0.6Ca alloy, while α-Mg and Mg₂Ca for the Mg-0.54Ca alloy. At the initial immersion stage, the corrosion rate of the Mg-1.33Li-0.6Ca alloy is slightly faster than that of the Mg-0.54Ca alloy, whereas at the subsequent period the Mg-1.33Li-0.6Ca alloy has a corrosion resistance higher than the Mg-0.54Ca alloy. Lithium let to the formation of a dense corrosion product layer, which consists LiH, Mg(OH)₂, MgCO₃, CaCO₃, CaMgCO₃ and CaMgPO₄ for the Mg-1.33Li-0.6Ca alloy, however, it consists of MgCO₃, CaCO₃ and CaMgPO₄ for Mg-0.54Ca. Pitting and filiform corrosions are the main corrosion types of these alloys in SBFs.

Key words： magnesium-lithium-calcium alloy; biomaterial; corrosion; simulated body fluid; polarization

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