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| Understanding the galvanic corrosion of the Q-phase/Al couple using SVET and SIET | |
| Ikeuba, Alexander I.; Zhang, Bo; Wang, Jianqiu; Han, En-Hou; Ke, Wei | |
| 2019-07-01 | |
| Source Publication | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
 |
| ISSN | 1005-0302 |
| Volume | 35Issue:7Pages:1444-1454 |
| Abstract | The galvanic corrosion of the Q-phase/Al couple in 0.1 M NaCl solutions has been studied using the scanning vibrating electrode technique (SVET), the scanning ion-selective electrode technique (SIET) and energy dispersive X-ray spectroscopy (EDX). The galvanic corrosion of the Q-phase/Al couple was found to be dependent on pH and immersion time. Current density maps obtained by SVET shows that the anodic oxidation processes emerge from Al in a localized manner in pH 2 and 6 solutions but is initiated in a uniform manner in pH 13 solution, whereas, the cathodic processes are more homogeneously distributed over the Q-phase at pH 2, 6 and 13. It is seen that the Q-phase remains cathodic in the Q-phase/Al couple in acidic, neutral and alkaline solutions indicating that the galvanic polarity of the Q-phase is independent of pH. The effect of the galvanic corrosion was largest at pH 2 and 13 compared to pH 6. The pH map obtained by SIET indicates that the galvanic activity of the Q-phase/Al couple proceeds via heavy alkalization of the Q-phase surface with the generation of appreciable amounts of OH-ions. The enrichment of Cu indicated by EDX is responsible for the observed cathodic activity of the Q-phase in the Q-phase/Al couple. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology. |
| Keyword | Q-phase Galvanic corrosion Scanning vibrating electrode technique (SVET) Scanning ion-selective electrode technique (SIET) Energy dispersive X-ray spectroscopy (EDX) |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000466369600028 |
| Publisher | JOURNAL MATER SCI TECHNOL |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/80967 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation GB/T 7714 | Ikeuba, Alexander I.,Zhang, Bo,Wang, Jianqiu,et al. Understanding the galvanic corrosion of the Q-phase/Al couple using SVET and SIET[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2019,35(7):1444-1454. |
| APA | Ikeuba, Alexander I.,Zhang, Bo,Wang, Jianqiu,Han, En-Hou,&Ke, Wei.(2019).Understanding the galvanic corrosion of the Q-phase/Al couple using SVET and SIET.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,35(7),1444-1454. |
| MLA | Ikeuba, Alexander I.,et al."Understanding the galvanic corrosion of the Q-phase/Al couple using SVET and SIET".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 35.7(2019):1444-1454. |
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