Understanding the galvanic corrosion of the Q-phase/Al couple using SVET and SIET

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英文篇名：Understanding the galvanic corrosion of the Q-phase/Al couple using SVET and SIET 作者：Alexander ; I.Ikeuba ; Bo ; Zhang ; Jianqiu ; Wang ; En-Hou ; Han ; Wei ; Ke 英文作者：Alexander I.Ikeuba;Bo Zhang;Jianqiu Wang;En-Hou Han;Wei Ke;Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences;CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences;University of Chinese Academy of Sciences (UCAS);Department of Pure and Applied Chemistry, University of Calabar; 英文关键词：Q-phase;;Galvanic corrosion;;Scanning vibrating electrode technique(SVET);;Scanning ion-selective electrode technique(SIET);;Energy dispersive X-ray spectroscopy(EDX) 中文刊名：CLKJ 英文刊名：材料科学技术(英文版) 机构：Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences;CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences;University of Chinese Academy of Sciences (UCAS);Department of Pure and Applied Chemistry, University of Calabar; 出版日期：2019-07-15 出版单位：Journal of Materials Science & Technology 年：2019 期：v.35 基金：financially supported by the National Natural Science Foundation of China (Grant No. 51571201) 语种：英文; 页：CLKJ201907028 页数：11 CN：07 ISSN：21-1315/TG 分类号：236-246

摘要

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.
        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.

引文

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