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

doi:10.1149/1945-7111/ab6a66

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	SVET and ToF-SIMS Studies on the Galvanic Corrosion of β-phase/Aluminum Couple in Aqueous Solutions as a Function of pH
	Ikeuba,Alexander I.1,2; Zhang,Bo 1; Ita,Benedict I.2
通讯作者	Zhang,Bo()
	2020-01-28
发表期刊	Journal of The Electrochemical Society
ISSN	0013-4651
卷号	167 期号:2
摘要	The galvanic corrosion of the β-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.
DOI	10.1149/1945-7111/ab6a66
语种	英语
WOS记录号	IOP:0013-4651-167-2-ab6a66
出版者	IOP Publishing
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/80609
专题	中国科学院金属研究所
通讯作者	Zhang,Bo
作者单位	1.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China 2.Department of Pure and Applied Chemistry, University of Calabar, Calabar, Nigeria
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 β-phase/Aluminum Couple in Aqueous Solutions as a Function of pH[J]. Journal of The Electrochemical Society,2020,167(2).
APA	Ikeuba,Alexander I.,Zhang,Bo,&Ita,Benedict I..(2020).SVET and ToF-SIMS Studies on the Galvanic Corrosion of β-phase/Aluminum Couple in Aqueous Solutions as a Function of pH.Journal of The Electrochemical Society,167(2).
MLA	Ikeuba,Alexander I.,et al."SVET and ToF-SIMS Studies on the Galvanic Corrosion of β-phase/Aluminum Couple in Aqueous Solutions as a Function of pH".Journal of The Electrochemical Society 167.2(2020).