摘要
某站内管道服役3年后发生穿孔泄漏,通过宏观检验、无损探伤、理化性能测试、扫描电镜及能谱分析等手段研究管道失效的原因。结果表明:泄漏管道各项理化性能均符合技术要求,管道防腐层失效,外壁腐蚀减薄严重;含水含腐蚀性离子的服役环境提供了腐蚀的基本条件,土壤Cl-富集诱发点蚀形成闭塞腐蚀电池,促进了腐蚀坑沿壁厚方向发展直至穿孔。该管道泄漏失效主要是由管道防腐层失效引起的外腐蚀穿孔造成的。
The pipe leakage occurs in a station after three years of service.By means of macroscopic inspection,nondestructive testing,physical and chemical properties testing,scanning electron microscopy and energy spectrum analysis,the causes of pipeline failure were determined.The results show that the physical and chemical properties of the leakage pipeline meet the technical requirements.The anticorrosive coating for pipeline is failed,and the thinning of the corrosion of the exterior wall is serious.The environment containing water and corrosive ions provides the basic condition of corrosion.The block corrosion cell caused by pitting induced by Cl-enrichment promotes the development of corrosion pit along the thickness direction until the perforation.The leakage failure of the pipeline is mainly caused by external corrosion perforation caused by the failure of the pipeline anticorrosive coating.
作者
罗立辉
牛大宇
宋鹏迪
王文渊
赵喆
LUO Lihui;NIU Dayu;SONG Pengdi;WANG Wenyuan;ZHAO Zhe(School of Materials Science and Engineering,Xi'an Shiyou University,Xi'an 710065,China;First Branch of Pipeline Transportation of Shaanxi Yanchang Petroleum Co.,Ltd.,Xi'an 718500,China;School of Materials Science and Engineering Chang'an University,Xi'an 710064,China)
出处
《热加工工艺》
北大核心
2023年第18期139-142,138,共5页
Hot Working Technology
关键词
失效泄漏
土壤腐蚀
局部腐蚀
failure leakage
soil corrosion
localized corrosion
