Anticorrosion performance of the coating/metal system by electrochemical impedance spectra

Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material Pub Date : 2008-08-01 DOI:10.1016/S1005-8850(08)60086-9

Yinghuai Zhang, Lining Xu, Minxu Lu, Pu Zhang

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引用次数: 1

Abstract

In order to investigate the anticorrosion performance of the organic coating/metal system, electrochemical impedance spectra (EIS) were measured in the 3.5wt% NaCl solution, the chemical component and the formation of corrosion products scale were analyzed by laser Raman microspectroscopy, and the pattern of the organic coating/metal system was observed by scanning electron microscopy (SEM). The characteristics and the delamination process of the organic coating/metal system were investigated systematically, and the emphases were on the transportation of the corrosive medium and the changes of the coating/metal interface. The results show that the impedance decreases at the initial immersion, then increases at the middle-immersion, and again decreases at last, which is related to the corrosion products scale. The concentration of Cl⁻ in the coating, which destroys the corrosion products scale, increases with the immersion time.

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电化学阻抗谱法研究涂层/金属体系的防腐性能

为了研究有机涂层/金属体系的防腐性能，在3.5wt%NaCl溶液中测量了电化学阻抗谱（EIS），用激光拉曼显微光谱法分析了化学成分和腐蚀产物水垢的形成，并用扫描电子显微镜（SEM）观察了有机涂层/金属体系的形貌。系统地研究了有机涂层/金属体系的特性和分层过程，重点研究了腐蚀介质的传输和涂层/金属界面的变化。结果表明，阻抗在初始浸入时减小，然后在中间浸入时增大，最后又减小，这与腐蚀产物的规模有关。涂层中的Cl−浓度会随着浸泡时间的增加而增加，从而破坏腐蚀产物的水垢。

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Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material

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