Li Zhong, Li Caiyu, Qian Hongchang, Li Jun, Huang Liang, Du Cuiwei
Department of Chemical and Biomolecular Engineering, Institute for Corrosion and Multiphase Technology, Ohio University, Athens, OH 45701, USA.
Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China.
Materials (Basel). 2017 Jun 28;10(7):720. doi: 10.3390/ma10070720.
The corrosion behavior of X80 steel in the presence of coupled coating defects was simulated and studied under the interference of alternating current (AC) in an alkaline environment. The results from electrochemical measurements showed that the electrode potential of the coating defect with the smaller exposed area was lower than that with the larger area, which indicated that the steel with the smaller coating defect was more prone to corrosion. The result of weight loss tests also showed that the smaller coating defect had induced a higher corrosion rate. However, the corrosion rate of X80 steel at the larger coating defect decreased gradually with the increase of the larger defect area at a constant smaller defect area. The corrosion morphology images showed that the coating defects with smaller areas suffered from more severe pitting corrosion.
在碱性环境中，在交流电干扰下模拟并研究了X80钢在存在耦合涂层缺陷情况下的腐蚀行为。电化学测量结果表明，暴露面积较小的涂层缺陷处的电极电位低于暴露面积较大的涂层缺陷处，这表明涂层缺陷较小的钢更容易发生腐蚀。失重试验结果也表明，较小的涂层缺陷导致了更高的腐蚀速率。然而，在较小涂层缺陷面积不变的情况下，随着较大缺陷面积的增加，X80钢在较大涂层缺陷处的腐蚀速率逐渐降低。腐蚀形貌图像显示，面积较小的涂层缺陷遭受的点蚀更严重。
