剥离涂层下的X80钢在鹰潭土壤模拟溶液中的腐蚀行为
收稿日期: 2012-06-25
修回日期: 2012-09-26
网络出版日期: 2012-12-11
基金资助
国家自然科学基金项目51131001和50971016, 以及中央高校基本科研业务费专项资金项目FRF-TP-09-029B资助
CORROSION BEHAVIOR OF X80 STEEL IN YINGTAN SOIL SIMULATED SOLUTION UNDER DISBONDED COATING
Received date: 2012-06-25
Revised date: 2012-09-26
Online published: 2012-12-11
Supported by
Supported by National Natural Science Foundation of China (Nos.51131001 and 50971016) and Fundamental Research Funds for the Central Universities (No.FRF–TP–09–029B)
构建了埋地管线钢在鹰潭土壤模拟溶液中的矩形缝隙剥离涂层模型, 采用原位电化学测量方法对剥离区的X80钢进行电化学交流阻抗谱(EIS)表征,并对其腐蚀行为进行了研究. 结果表明, 腐蚀初期剥离区各位置的电化学反应特征相同, EIS由高频容抗弧和低频感抗弧组成. 随着腐蚀反应进行,高频容抗弧半径增大, 低频感抗弧消失. 距漏点不同距离的X80钢试样的腐蚀程度有所区别: 漏点处和剥离区底部的腐蚀最严重, 为吸氧腐蚀和阳极溶解所致; 剥离区中部腐蚀较弱, 去除腐蚀产物的X80钢表面出现明显的点蚀坑, 点蚀倾向加重, 腐蚀类型由全面腐蚀向局部腐蚀转变.根据EIS规律和实验结果, 剥离区的腐蚀进程可分为氧耗尽、阴离子迁移和腐蚀扩展3个阶段.
关键词： 剥离涂层; 腐蚀; 原位电化学测试; 电化学交流阻抗谱(EIS)
赵博 杜翠薇 刘智勇 李晓刚 杨吉可 李月强 . 剥离涂层下的X80钢在鹰潭土壤模拟溶液中的腐蚀行为[J]. 金属学报, 2012 , 48(12) : 1530 -1536 . DOI: 10.3724/SP.J.1037.2012.00374
In this work, a rectangular crevice disbanded coating model of buried steel pipeline in Yingtan soil simulated solution was made, and the in situ electrochemical measurement of electrochemical impedance spectroscopy (EIS) was used for characterization of X80 steel under the disbonded coating, at the same time, the corrosion behavior was also investigated. The results showed that the electrochemical characteristics in each position of disbonded area was almost same in the early corrosion time, and the EIS was composed of high–frequency capacitance and low–frequency inductance. After corrosion occurred, the high–frequency capacitance radius increased, and the low–frequency inductance disappeared. The extent of corrosion of X80 steel specimen surface was rather distinct with distance from holiday. The corrosion at holiday and the bottom of disbonded area was most serious because of oxygen corrosion and anodic dissolution. However, in the central, it was weaker. After removing the corrosion product, pits appeared obviously on the specimen surface in the central of disbonded area,indicating that the tendency of pitting occurring increased, and the type of corrosion changed from general corrosion to localized corrosion. According to the EIS and experimental results, the corrosion process under disbanded area could be divided into three steps: oxygen depletion, anion migration and corrosion expansion.
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