Effect of Microstructure on Corrosion Behavior of Mg-Sr Alloy in Hank's Solution

doi:10.1007/s40195-018-0750-4

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	Effect of Microstructure on Corrosion Behavior of Mg-Sr Alloy in Hank's Solution
	Dong, Jia-Hui 1,2; Tan, Li-Li 1; Ren, Yi-Bin 1; Yang, Ke 1
刊名	ACTA METALLURGICA SINICA-ENGLISH LETTERS
	2019-03-01
卷号	32 期号:3 页码:305-320
关键词	Mg-Sr alloy Microstructure Corrosion Extrusion Heat treatment
ISSN号	1006-7191
DOI	10.1007/s40195-018-0750-4
通讯作者	Tan, Li-Li(lltan@imr.ac.cn)
英文摘要	Mg-Sr alloy has been studied as a potential biodegradable material with excellent bioactivity to promote the bone formation. However, its degradation behavior needs to be well controlled to avoid the negative effect, which is important for future application. Therefore in this study, the microstructure and its effect on corrosion behavior of an Mg-1.5Sr alloy were investigated. The microstructures of the alloy under different processing procedures were characterized by both optical and scanning electron microscopes. The corrosion performance was studied in Hank's solution using immersion, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests. The results showed that the grain size and the amount and distribution of beta-Mg17Sr2 had obvious effects on the corrosion behavior of Mg-Sr alloy. The smaller the grain size was, the more the protective surface layer formed on Mg-Sr alloy, and the higher the corrosion resistance was. For the as-cast Mg-Sr alloy, the network-like second phases precipitated along the grain boundaries could not hinder the corrosion due to their own corrosion cracking accelerating the intergranular corrosion. However, the refinement of second phases increased the corrosion resistance of the as-extruded alloy. After solution treatment at 450 degrees C for 5 h, the grains in the alloy did not grow much and beta-Mg17Sr2 phases homogenously distributed in the alloy, resulting in the increase in corrosion resistance. However, after aging treatment, large amount of precipitated second phases increased the galvanic corrosion of the alloy, accelerating the development of corrosion.
资助项目	National Key Research on Development Program of China[2016YFC1101804] ; National High Technology Research and Development Program of China[2015AA033701] ; National Natural Science Foundation of China[81401773] ; National Natural Science Foundation of China[31500777] ; Institute of Metal Research, Chinese Academy of Sciences[2015-ZD01]
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	CHINESE ACAD SCIENCES, INST METAL RESEARCH
WOS记录号	WOS:000462257400004
资助机构	National Key Research on Development Program of China ; National High Technology Research and Development Program of China ; National Natural Science Foundation of China ; Institute of Metal Research, Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/132525]
专题	金属研究所_中国科学院金属研究所
通讯作者	Tan, Li-Li
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Dong, Jia-Hui,Tan, Li-Li,Ren, Yi-Bin,et al. Effect of Microstructure on Corrosion Behavior of Mg-Sr Alloy in Hank's Solution[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2019,32(3):305-320.
APA	Dong, Jia-Hui,Tan, Li-Li,Ren, Yi-Bin,&Yang, Ke.(2019).Effect of Microstructure on Corrosion Behavior of Mg-Sr Alloy in Hank's Solution.ACTA METALLURGICA SINICA-ENGLISH LETTERS,32(3),305-320.
MLA	Dong, Jia-Hui,et al."Effect of Microstructure on Corrosion Behavior of Mg-Sr Alloy in Hank's Solution".ACTA METALLURGICA SINICA-ENGLISH LETTERS 32.3(2019):305-320.