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SVET and ToF-SIMS Studies on the Galvanic Corrosion of beta-phase/Aluminum Couple in Aqueous Solutions as a Function of pH
Ikeuba, Alexander I.1,2; Zhang, Bo1,3; Ita, Benedict I.2
Corresponding AuthorZhang, Bo(bxz011@imr.ac.cn)
2020-01-28
Source PublicationJOURNAL OF THE ELECTROCHEMICAL SOCIETY
ISSN0013-4651
Volume167Issue:2Pages:14
AbstractThe galvanic corrosion of the beta-phase (Al3Mg2)/Al couple has been studied using electrochemical methods, scanning vibrating electrode technique (SVET) and Time of flight-secondary ion spectroscopy (ToF-SIMS). Polarization tests reveal that Al3Mg2 is anodic relative to pure Al at pH <= 10. Visualization of the current density distribution over the Al3Mg2/Al galvanic couple by SVET reveals that at pH 2, an intense and stochastic anodic current density is evolved from Al3Mg2 while a heavy cathodic current flux is sustained on the surrounding Al matrix. At pH 6 and 10, localized both cathodic and anodic regions are seen on Al3Mg2 indicating its self-dissolution while the surrounding Al matrix remained relatively inert. However, at pH 13, a reversal of polarity occurs and Al3Mg2 becomes cathodic relative to Al. The severity of the galvanic coupling of Al3Mg2 to Al is in the order pH 13 > pH 2 > pH 6 > pH 10. ToF-SIMS analysis reveals that the dealloying of Al3Mg2 in the galvanic couple is by selective dissolution of Mg leading to the deposition of corrosion products dominated by Mg compounds in an acidic and neutral environment. In an alkaline environment, a relatively thin hydroxide rich film is formed. (C) 2020 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.
Funding Organizationministry of science and technology of China ; National Natural Science Foundation of China
DOI10.1149/1945-7111/ab6a66
Indexed BySCI
Language英语
Funding Projectministry of science and technology of China[2017YFA0204401] ; National Natural Science Foundation of China[51571201]
WOS Research AreaElectrochemistry ; Materials Science
WOS SubjectElectrochemistry ; Materials Science, Coatings & Films
WOS IDWOS:000517813100001
PublisherELECTROCHEMICAL SOC INC
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/137376
Collection中国科学院金属研究所
Corresponding AuthorZhang, Bo
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
2.Univ Calabar, Dept Pure & Appl Chem, Calabar, Nigeria
3.72 Wenhua Rd, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Ikeuba, Alexander I.,Zhang, Bo,Ita, Benedict I.. SVET and ToF-SIMS Studies on the Galvanic Corrosion of beta-phase/Aluminum Couple in Aqueous Solutions as a Function of pH[J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY,2020,167(2):14.
APA Ikeuba, Alexander I.,Zhang, Bo,&Ita, Benedict I..(2020).SVET and ToF-SIMS Studies on the Galvanic Corrosion of beta-phase/Aluminum Couple in Aqueous Solutions as a Function of pH.JOURNAL OF THE ELECTROCHEMICAL SOCIETY,167(2),14.
MLA Ikeuba, Alexander I.,et al."SVET and ToF-SIMS Studies on the Galvanic Corrosion of beta-phase/Aluminum Couple in Aqueous Solutions as a Function of pH".JOURNAL OF THE ELECTROCHEMICAL SOCIETY 167.2(2020):14.
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