SVET and SIET Study of Galvanic Corrosion of Al/MgZn2 in Aqueous Solutions at Different pH

doi:10.1149/2.0861803jes

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	SVET and SIET Study of Galvanic Corrosion of Al/MgZn2 in Aqueous Solutions at Different pH
	Ikeuba, AI ; Zhang, B ; Wang, JQ ; Han, EH ; Ke, W 4; Okafor, PC
刊名	JOURNAL OF THE ELECTROCHEMICAL SOCIETY
	2018-02-04
卷号	165 期号:3 页码:C180-C194
ISSN号	0013-4651
DOI	10.1149/2.0861803jes
英文摘要	The 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.
学科主题	Electrochemistry ; Materials Science, Coatings & Films
语种	英语
WOS记录号	WOS:000431790700055
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/80253]
专题	金属研究所_中国科学院金属研究所
作者单位	1.[Ikeuba, Alexander I. 2.Zhang, Bo 3.Wang, Jianqiu 4.Han, En-Han 5.Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Liaoning, Peoples R China 6.[Ikeuba, Alexander I.] UCAS, Beijing 100049, Peoples R China 7.[Ikeuba, Alexander I. 8.Okafor, Peter C.] Univ Calabar, Dept Pure & Appl Chem, Corros & Electrochem Res Grp, Calabar, Nigeria
推荐引用方式 GB/T 7714	Ikeuba, AI,Zhang, B,Wang, JQ,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, AI,Zhang, B,Wang, JQ,Han, EH,Ke, W,&Okafor, PC.(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, AI,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.