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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
Source PublicationELECTROCHIMICA ACTA
ISSN0013-4686
Volume260Pages:55-64
AbstractThe 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.
description.department[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
KeywordMagnesium Alloys Electrochemical Impedance Crystallographic Texture Mechanical Anisotropy Icosahedral Phase Al Composition Strength Spectroscopy Deformation Dissolution
Subject AreaElectrochemistry
Funding OrganizationNational 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
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79588
Collection中国科学院金属研究所
Corresponding AuthorBirbilis, 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.
Recommended Citation
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.
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