Corrosion Behavior of Epoxy Coating/Carbon Steel System under the Wet-Dry Cycles
Corrosion Behavior of Epoxy Coating/Carbon Steel System under the Wet-Dry Cycles
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环氧涂层/碳钢体系在干湿循环下的腐蚀行为
DOI：
10.4028/www.scientific.net/amr.393-395.663
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
B. An
中科院分区：
文献类型：
--
作者：
Xuan Zhang;B. An
针对涂层/金属体系在大气环境中不可避免地会发生局部降解而导致金属暴露的情况，建立了模拟该体系的电化学电池。采用电化学阻抗谱、扫描电镜和傅里叶变换红外光谱等技术研究了环氧涂层/碳钢体系在3wt%NaCl溶液中的腐蚀行为。结果表明，暴露钢的腐蚀速率在第4次干湿循环时达到最大值，然后逐渐降低;而涂层钢的腐蚀速率在第6次干湿循环时达到最大值，然后随循环次数的增加缓慢降低至稳定状态。此外，暴露金属表面的开放电解质层和涂层下的封闭层之间的离子扩散和迁移，使暴露钢表面的腐蚀产物呈现出从暴露钢中心到周围的阶梯状形貌，而涂层下的腐蚀产物则呈现出放射状的涟漪形貌。
In view of occasion that the coating/metal system served in atmosphere inevitably occurs the local degradation and thus results the exposure of metal, an electrochemical cell to simulate such system was built up. By using this cell, the corrosion behavior of epoxy coating/carbon steel system covered by a thin layer of electrolyte of 3wt% NaCl solution under the wet-dry cycles was investigated with using electrochemical impedance spectroscopy, scanning electronic microscopy and Fourier transformation infrared spectroscopy. The results show that the corrosion rate of exposed steel reaches the largest value at the 4th wet-dry cycle and then gradually decreases, however, the corrosion rate of coated steel reaches maximum at the 6th cycle and then decreases slowly to a steady-state with cycles. Furthermore, the ions diffusion and migration between the open electrolyte layer covering on the exposed metal and the confined layer under the coating cause the corrosion products onto the exposed steel to present the layered ladder morphology from the centre of exposed steel to its periphery, however, the corrosion product formed under the coating has radial ripple morphology.
影响因子：
8.3
作者：
R. Cruz;A. Nishikata;T. Tsuru
通讯作者：
R. Cruz;A. Nishikata;T. Tsuru