海上平台栈桥输油管线腐蚀失效原因  

Corrosion Failure Reason of Transport Pipeline on Offshore Platform

作　　者：马晓勇[1] 杨明[1] 龙云[1] 赵大伟[1] 陈超[1] 杨皓洁[1] 

机构地区：[1]中海油能源发展股份有限公司,上海环境工程技术分公司,上海200032

出　　处：《腐蚀与防护》2015年第3期230-233,239,共5页Corrosion & Protection

摘　　要：某海上平台栈桥输油管线在投产不到2a时间内即发生局部腐蚀泄漏,泄漏部位处于管道底部焊缝连接位置。为了研究其腐蚀原因及对今后腐蚀控制提供参考,对发生腐蚀泄漏部位进行材质理化检验、腐蚀部位宏观形貌及SEM观察、能谱分析、腐蚀产物X射线衍射分析及电化学分析。结果表明,CO2腐蚀是造成该输油管线泄漏的原因,而导致焊接处优先发生泄漏的主要原因是焊缝和母材材质不匹配及焊接工艺不当引起焊缝自腐蚀电位低以及沟槽敏感性高。Serious damage occurred on offshore platform pipeline in the production only after its service for only 2 years, the leak position was found in the pipe weld connections at the bottom of the pipe. The failed pipe was analyzed by means of chemical and mechanical properties tests, microstructure examination, XRD and energy dispersive spectroscopy （EDS） to find out the corrosion and leakage reasons. The results showed that the reason of the pipeline corrosion was CO2 corrosion. The priority leakage reasons of welding were improper welding seam and high sensitivity of groove.

关 键 词：海上平台 输油管线 CO2腐蚀 自腐蚀电位 沟槽腐蚀 

分 类 号：TG172[金属学及工艺—金属表面处理]