| 引用本文: | 刘杰,王伟,王佳.结合EIS和WBE技术研究环氧涂层劣化[J].材料科学与工艺,2013,21(5):33-39.DOI:10.11951/j.issn.1005-0299.20130506. |
| LIU Jie,WANG Wei,WANG Jia.Evaluation of the deterioration of epoxy coating by EIS and WBE techniques[J].Materials Science and Technology,2013,21(5):33-39.DOI:10.11951/j.issn.1005-0299.20130506. |
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| 结合EIS和WBE技术研究环氧涂层劣化 |
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刘杰1,2,王伟3, 王佳3,4
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(1.中国兵器工业第五九研究所,重庆 400039;2.南京理工大学 机械工程学院,南京 210094;3.中国海洋大学 化学化工学院,山东青岛 266100;4.中国科学院金属研究所 金属腐蚀与防护国家重点实验室,沈阳 110016)
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| 摘要: |
| 为研究环氧涂层在浸泡条件下的失效机理,结合丝束电极(WBE)和电化学阻抗谱(EIS)技术研究了环氧涂层浸泡在天然海水中的劣化过程, 同时分析了与涂层局部缺陷区相对应的电流密度分布和阻抗谱特征的差异．结果表明:丝束电极表面电流密度分布与EIS响应特征能够良好对应,两者结合使用可以实现对表面任意局部阳极和阴极区腐蚀过程的研究;涂层丝束电极的总阻抗响应主要与涂层局部缺陷最为严重处的电极过程特征相对应,而不能反映出其他区域的涂层劣化和涂层下基体的电化学过程信息;涂层下丝束电极出现了极性转换现象,但发生转换的原因各不相同． |
| 关键词: 电化学阻抗谱 丝束电极 环氧涂层 电流密度分布 极性转换 |
| DOI：10.11951/j.issn.1005-0299.20130506 |
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| Evaluation of the deterioration of epoxy coating by EIS and WBE techniques |
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LIU Jie1,2, WANG Wei3, WANG Jia3,4
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(1. No. 59 Research Institute of China Ordnance Industry, Chongqing 400039, China;2. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;3. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;4. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China)
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| Abstract: |
| To research the failure mechanism of epoxy coating under soaking condition, the deterioration process of epoxy coating immersed in natural seawater was investigated by the wire beam electrode (WBE) and electrochemical impedance spectroscopy (EIS) techniques, and the differences of the current density distribution and EIS characteristics for local regions with defects in the coating were analyzed. The results show that the current density distribution has a close corresponding relationship with EIS characteristics in the whole or local areas, and WBE technique combined with EIS is a powerful tool to investigate the corrosion process of anodic and cathodic regions of the defects and underlying coatings. During the entire coating deterioration process, the EIS characteristics were positively correlated with the substrate corrosion process of the most serious defect, and other regions of the coating and underlying electrochemical processes were suppressed. The polarity transition of the electrode under the coating was observed, and the reasons for the phenomena were different from each other. |
| Key words: wire beam electrode electrochemical impedance spectroscopy epoxy coating current density distribution polarity transition. |
