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SVET and SIET Study of Galvanic Corrosion of Al/MgZn2 in Aqueous Solutions at Different pH
Ikeuba, Alexander I.1,2,3; Zhang, Bo1; Wang, Jianqiu1; Han, En-Han1; Ke, Wei1; Okafor, Peter C.3
Corresponding AuthorZhang, Bo(bxz011@imr.ac.cn)
2018
Source PublicationJOURNAL OF THE ELECTROCHEMICAL SOCIETY
ISSN0013-4651
Volume165Issue:3Pages:C180-C194
AbstractThe galvanic corrosion behavior of synthesized MgZn2 intermetallic particle coupled with Al in 0.1 M NaCl solutions across pH 2 to12 has been studied using the scanning vibrating electrode technique (SVET), the scanning ion-selective electrode technique (SIET) and X-ray photoelectron spectroscopy (XPS). Results indicate the galvanic dissolution of MgZn2 depends on pH as well as exposure time. SVET current density maps reveal that MgZn2 is anodic relative to Al at pH 2 but cathodic at pH 12, while self-dissolution of MgZn2 prevails at pH 4 and 6. However, the galvanic coupling effect is more pronounced at pH 2 and 12. SIET maps of H+ and Cl- ion distribution reveal evidence of local alkalization on MgZn2 and migration of Cl- ions away from MgZn2 surface at pH 4 and 6 due to significant accumulation of OH- ions. Preferential dissolution of Mg occurs leading to segregation of Mg compounds in the outer layers of the film and Zn enrichment on the matrix/solution interface. In slightly acidic and near neutral solutions MgO/Mg(OH)(2) dominates the outer layers and MgO/Mg(OH)(2)/ZnO dominates the inner layers, however, at pH 12 a stable MgO/Mg(OH)(2) passive film is formed. (C) The Author(s) 2018. Published by ECS.
Funding OrganizationNational Natural Science Foundation of China
DOI10.1149/2.0861803jes
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51571201]
WOS Research AreaElectrochemistry ; Materials Science
WOS SubjectElectrochemistry ; Materials Science, Coatings & Films
WOS IDWOS:000431790700055
PublisherELECTROCHEMICAL SOC INC
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/128119
Collection中国科学院金属研究所
Corresponding AuthorZhang, Bo
Affiliation1.Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Liaoning, Peoples R China
2.UCAS, Beijing 100049, Peoples R China
3.Univ Calabar, Dept Pure & Appl Chem, Corros & Electrochem Res Grp, Calabar, Nigeria
Recommended Citation
GB/T 7714
Ikeuba, Alexander I.,Zhang, Bo,Wang, Jianqiu,et al. SVET and SIET Study of Galvanic Corrosion of Al/MgZn2 in Aqueous Solutions at Different pH[J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY,2018,165(3):C180-C194.
APA Ikeuba, Alexander I.,Zhang, Bo,Wang, Jianqiu,Han, En-Han,Ke, Wei,&Okafor, Peter C..(2018).SVET and SIET Study of Galvanic Corrosion of Al/MgZn2 in Aqueous Solutions at Different pH.JOURNAL OF THE ELECTROCHEMICAL SOCIETY,165(3),C180-C194.
MLA Ikeuba, Alexander I.,et al."SVET and SIET Study of Galvanic Corrosion of Al/MgZn2 in Aqueous Solutions at Different pH".JOURNAL OF THE ELECTROCHEMICAL SOCIETY 165.3(2018):C180-C194.
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