Composition and microstructure dependent corrosion behaviour of Mg-Li alloys

IMR OpenIR

	Composition and microstructure dependent corrosion behaviour of Mg-Li alloys
	Li, CQ; Xu, DK; Chen, XB; Wang, BJ; Wu, RZ; Han, EH; Birbilis, N; Birbilis, N (reprint author), Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Liaoning, Peoples R China.; Xu, DK (reprint author), Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia.
	2018-01-10
发表期刊	ELECTROCHIMICA ACTA
ISSN	0013-4686
卷号	260 页码:55-64
摘要	The corrosion and electrochemical behaviour of carefully prepared ultra-lightweight magnesium-lithium (Mg-Li) alloys were investigated and compared. The alloy compositions studied were selected to provide the ability to compare unique microstructures and crystal structures, which arise from specific alloying additions of Li. Mg-4% Li is hexagonal closed-packed (HCP) alloy with Li in solid solution of Mg (alpha-Mg); Mg-14% Li is a fully solid solution BCC (beta-Li) alloy, whilst Mg-7.5% Li is a duplex (alpha-Mg thorn beta-Li) alloy. Testing in 0.1 M NaCl revealed that the corrosion performance and electrochemical response of the Mg-Li system evolved with the composition and crystallographic structure. For Mg-4% Li alloy, filiform-like corrosion morphology can be observed on the corroded surface, whilst a mixture of filiform-like corrosion to the alpha-Mg and localised dissolution of b-Li existed on the corroded surface of Mg-7.5% Li alloy. In the case of the BCC structured Mg-14% Li alloy, minor pitting was observed, concomitant with a generally low corrosion rate (particularly low corrosion rate for typical Mg alloys) and an increasing corrosion resistance with exposure time were also revealed. A combination of exposure testing inclusive of hydrogen collection and mass loss, in addition to potentiodynamic polarisation and impedance spectroscopy elucidated and quantified the corrosion performance of three differently structured Mg-Li alloys. It revealed that in spite of being composed of reactive elements of Mg and Li, the formation of beta-Li phases with BCC structure could facilitate the formation of a highly protective surface film which results in a predictable and consistently low corrosion rate of the Mg-14% Li alloy. (C) 2017 Elsevier Ltd. All rights reserved.; The corrosion and electrochemical behaviour of carefully prepared ultra-lightweight magnesium-lithium (Mg-Li) alloys were investigated and compared. The alloy compositions studied were selected to provide the ability to compare unique microstructures and crystal structures, which arise from specific alloying additions of Li. Mg-4% Li is hexagonal closed-packed (HCP) alloy with Li in solid solution of Mg (alpha-Mg); Mg-14% Li is a fully solid solution BCC (beta-Li) alloy, whilst Mg-7.5% Li is a duplex (alpha-Mg thorn beta-Li) alloy. Testing in 0.1 M NaCl revealed that the corrosion performance and electrochemical response of the Mg-Li system evolved with the composition and crystallographic structure. For Mg-4% Li alloy, filiform-like corrosion morphology can be observed on the corroded surface, whilst a mixture of filiform-like corrosion to the alpha-Mg and localised dissolution of b-Li existed on the corroded surface of Mg-7.5% Li alloy. In the case of the BCC structured Mg-14% Li alloy, minor pitting was observed, concomitant with a generally low corrosion rate (particularly low corrosion rate for typical Mg alloys) and an increasing corrosion resistance with exposure time were also revealed. A combination of exposure testing inclusive of hydrogen collection and mass loss, in addition to potentiodynamic polarisation and impedance spectroscopy elucidated and quantified the corrosion performance of three differently structured Mg-Li alloys. It revealed that in spite of being composed of reactive elements of Mg and Li, the formation of beta-Li phases with BCC structure could facilitate the formation of a highly protective surface film which results in a predictable and consistently low corrosion rate of the Mg-14% Li alloy. (C) 2017 Elsevier Ltd. All rights reserved.
部门归属	[li, c. q. ; chen, x. -b. ; birbilis, n.] chinese acad sci, inst met res, cas key lab nucl mat & safety assessment, shenyang 110016, liaoning, peoples r china ; [li, c. q. ; xu, d. k. ; han, e. h.] monash univ, dept mat sci & engn, clayton, vic 3800, australia ; [li, c. q. ; han, e. h.] northeastern univ, minist educ, key lab anisotropy & texture mat, shenyang 110819, liaoning, peoples r china ; [chen, x. -b.] rmit univ, sch engn, carlton, vic 3053, australia ; [wang, b. j.] shenyang ligong univ, sch environm & chem engn, shenyang 110159, liaoning, peoples r china ; [wu, r. z.] harbin engn univ, key lab superlight mat & surface technol, minist educ, harbin 150001, heilongjiang, peoples r china
关键词	Magnesium Alloys Electrochemical Impedance Crystallographic Texture Mechanical Anisotropy Icosahedral Phase Al Composition Strength Spectroscopy Deformation Dissolution
学科领域	Electrochemistry
资助者	National Key Research and Development Program of China [2017YFB0702001]; National Natural Science Foundation of China [51701129, 51271183, 51301172]; Strategic New Industry Development Special Foundation of Shenzhen [JCYJ20170306141749970]; National Basic Research Program of China (973 Program) [2013CB632205]; Innovation Fund of Institute of Metal Research (IMR), Chinese Academy of Sciences; China Scholarship Council; Australian Research Council [DP150103290]; Woodside Energy
收录类别	SCI
语种	英语
WOS记录号	WOS:000419831600007
引用统计	被引频次：185[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/79588
专题	中国科学院金属研究所
通讯作者	Birbilis, N (reprint author), Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Liaoning, Peoples R China.; Xu, DK (reprint author), Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia.
推荐引用方式 GB/T 7714	Li, CQ,Xu, DK,Chen, XB,et al. Composition and microstructure dependent corrosion behaviour of Mg-Li alloys[J]. ELECTROCHIMICA ACTA,2018,260:55-64.
APA	Li, CQ.,Xu, DK.,Chen, XB.,Wang, BJ.,Wu, RZ.,...&Xu, DK .(2018).Composition and microstructure dependent corrosion behaviour of Mg-Li alloys.ELECTROCHIMICA ACTA,260,55-64.
MLA	Li, CQ,et al."Composition and microstructure dependent corrosion behaviour of Mg-Li alloys".ELECTROCHIMICA ACTA 260(2018):55-64.