中性环境中锈斑对X70/X80钢早期腐蚀的作用  

The Effect of Early Corrosion on X70/X80 Steel Rust Spots in Neutral Environment

作　　者：刁照金[1] 吴明[1] 陈旭[1] 谢飞[1] 王丹[1] 石海涛[1] 

机构地区：[1]辽宁石油化工大学石油天然气工程学院,辽宁抚顺113001

出　　处：《辽宁石油化工大学学报》2014年第3期67-70,74,共5页Journal of Liaoning Petrochemical University

基　　金：国家自然科学基金资助项目(50771053)

摘　　要：采用NS4典型中性土壤模拟溶液模拟中性土壤环境,将X70和X80管线钢电化学试件在模拟溶液中进行短期浸泡,发现溃疡状锈斑均匀分布在试件的工作表面,锈迹疏松易脱落,微观呈现颗粒状形貌,面积较大的锈斑处出现浅腐蚀坑。对带锈件和不带锈件进行了极化曲线、交流阻抗等电化学实验并进行了对比。对比结果发现,金属界面早期锈斑的产生加重金属的腐蚀,加快腐蚀速率。这是因为早期锈斑的不完整性与稀疏性降低金属基体与腐蚀环境电化学反应的极化电阻,其粗糙的表面增加试件的工作面积,增大腐蚀电流。The X70and X80 steel electrochemical specimens were soaked shortly in NS4 solution which was simulated as a typical neutral soil environment.After that,ulcer-like,loose and easily-falling rust spots were found on them.Shallow corrosion pits occurred in larger rust spots.The electrochemical behaviors of specimens were investigated with polarization curve method and electrochemical impedance scan method.The results show that the rust spot increased corrosion trend of metals and accelerated the corrosion rate.This was due to the imperfection and separation of the early rust spots reduced the metal-environmental polarization resistance.The roughness of the surface increased the working area of the specimens and the corrosion current.

关 键 词：X70钢 X80钢 中性土壤 锈 早期腐蚀 

分 类 号：TE980.41[石油与天然气工程—石油机械设备] TG172.4[金属学及工艺—金属表面处理]