Understanding the galvanic corrosion of the Q-phase/Al couple using SVET and SIET |
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| Affiliation: | 1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;3. University of Chinese Academy of Sciences, (UCAS) 19A Yuquan Road, Shijingshan District, Beijing, 100049, China;4. Department of Pure and Applied Chemistry, University of Calabar, Calabar, PMB 1115 Nigeria;1. School of Materials Science and Engineering, Tianjin University, Tianjin, 300350, China;2. Max Planck Institute for Intelligent Systems, Heisenbergstrasse 3, D-70569, Stuttgart, Germany;3. Department of Physics, Shantou University, Shantou, 515063, China;1. Department of Physics, and Shenzhen Institute of Research and Innovation (HKU-SIRI), The University of Hong Kong, Pokfulam Road, Hong Kong, China;2. Vacuum Interconnected Nanotech Workstation, Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Suzhou, 215123, China;3. Guangdong Research Center for Interfacial Engineering of Functional Materials, and College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, China;1. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Shanghai Key Laboratory of Materials Laser Processing Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, 200240, Shanghai, China;2. Monash Centre for Additive Manufacturing (MCAM), Monash University, Clayton, VIC, 3800, Australia |
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| 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. |
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| Keywords: | Q-phase Galvanic corrosion Scanning vibrating electrode technique (SVET) Scanning ion-selective electrode technique (SIET) Energy dispersive X-ray spectroscopy (EDX) |
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