Comparison on corrosion behaviour of arc sprayed and zinc-rich coatings
Comparison on corrosion behaviour of arc sprayed and zinc-rich coatings
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DOI：
10.1016/j.surfcoat.2013.07.046
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发表时间：
2013-11-25
影响因子：
5.4
通讯作者：
Wei, D. D.
中科院分区：
文献类型：
--
作者：
Li, H. Y.;Duan, J. Y.;Wei, D. D.
利用扫描电镜（SEM）观察了电弧喷涂（AS）和富锌（ZR）涂层的微观组织。通过动电位极化曲线和电化学阻抗谱（EIS）等电化学测试方法研究了不同改性剂的耐蚀性能。扫描电镜观察表明，AS涂层的孔隙率较高，表面粗糙，而ZR涂层表面由均匀的球形颗粒组成。与ZR涂层相比，AS涂层的腐蚀电位向更负的方向移动。从EIS结果，它被提出，ZR涂层表现出比AS涂层大得多的阻抗值。一般模型被应用到模拟的AS涂层的EIS数据，而两个传输线模型（修改的德列维的类型）被用来考虑ZR腐蚀行为。在长期浸泡试验中，ZR涂层作为保护性钝化膜表现得更好，而ZR涂层横截面上出现的裂纹表明AS涂层的结合强度上级ZR涂层。皇冠版权所有（C）2013由爱思唯尔B.V.出版保留所有权利。
The microstructures of the arc sprayed (AS) and zinc-rich (ZR) coatings were observed by scanning electron microscopy (SEM). Furthermore, the different anti-corrosion properties were investigated through electrochemical experiments including potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS). The SEM observations revealed that the AS coating was more porous and coarser, while the ZR coating surface was composed of uniform spherical particles. The corrosion potential of AS coating was shifted to a more negative value than that of the ZR coating. From EIS results, it was proposed that the ZR coating exhibited much larger impedance values than the AS coating. General models are applied to simulate EIS data of the AS coating, while two transmission line models (modified de Levie's type) are used to account for ZR corrosion behaviour. The ZR coating performed better as a protective passive film during the long-term immersion test while the cracks that occurred in the cross section of ZR coating indicated that the adhesive strength of the AS coating was superior to that of the ZR coating. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.