剥离涂层下的X80钢在鹰潭土壤模拟溶液中的腐蚀行为

金属学报, 2012, 48(12): 1530-1536. doi: 10.3724/SP.J.1037.2012.00374

剥离涂层下的X80钢在鹰潭土壤模拟溶液中的腐蚀行为

赵博 ^1, , 杜翠薇 ^2, , 刘智勇 ^3, , 李晓刚 ^4, , 杨吉可 ^5, , 李月强 ^6,

基金项目: 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

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XS0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.

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剥离涂层下的X80钢在鹰潭土壤模拟溶液中的腐蚀行为

CORROSION BEHAVIOR OF X80 STEEL IN YINGTAN SOIL SIMULATED SOLUTION UNDER DISBONDED COATING

参考文献