SVET and ToF-SIMS Studies on the Galvanic Corrosion of beta-phase/Aluminum Couple in Aqueous Solutions as a Function of pH

doi:10.1149/1945-7111/ab6a66

IMR OpenIR

	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, Bo 1,3; Ita, Benedict I.2
通讯作者	Zhang, Bo(bxz011@imr.ac.cn)
	2020-01-28
发表期刊	JOURNAL OF THE ELECTROCHEMICAL SOCIETY
ISSN	0013-4651
卷号	167 期号:2 页码:14
摘要	The 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.
资助者	ministry of science and technology of China ; National Natural Science Foundation of China
DOI	10.1149/1945-7111/ab6a66
收录类别	SCI
语种	英语
资助项目	ministry of science and technology of China[2017YFA0204401] ; National Natural Science Foundation of China[51571201]
WOS研究方向	Electrochemistry ; Materials Science
WOS类目	Electrochemistry ; Materials Science, Coatings & Films
WOS记录号	WOS:000517813100001
出版者	ELECTROCHEMICAL SOC INC
引用统计	被引频次：30[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/321006/137376
专题	中国科学院金属研究所
通讯作者	Zhang, Bo
作者单位	1.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
推荐引用方式 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.