Φ108 mm×5 mm 排污管线焊缝内壁腐蚀穿孔原因  

Cause of Corrosion Perforation on Inner Wall ofΦ108 mm×5 mm Sewage Pipeline Weld

作　　者：王冬林 孔祥东 张佳宁 蔡彬 王志鹏[1,2] 余国民 WANG Donglin;KONG Xiangdong;ZHANG Jia'ning;CAI Bin;WANG Zhipeng;YU Guomin(CNPC Tubular Goods Research Institute,Xi'an 710077,China;Beijing Longsheng Taike Petroleum Pipe Technology Co.,Ltd.,Beijing 100101,China;Liaohe Petroleum Exploration Bureau Co.,Ltd.,Materials Branch,Panjin 124010,China;Shaanxi Natural Gas Co.,Ltd.,Xi'an 710018,China)

机构地区：[1]中国石油集团石油管工程技术研究院,陕西西安710077 [2]北京隆盛泰科石油管科技有限公司,北京100101 [3]辽河石油勘探局有限公司物资分公司,辽宁盘锦124010 [4]陕西省天然气股份有限公司,陕西西安710018

出　　处：《热加工工艺》2023年第9期157-159,162,共4页Hot Working Technology

基　　金：国家重点研发计划项目(2018YFF0215003)。

摘　　要：某油田现场φ108 mm×5 mm排污管线焊缝内壁发生腐蚀穿孔,进行了管线宏观形貌分析、化学成分分析、金相组织分析,及内壁提取物X射线衍射(XRD)分析、断口扫描电镜(SEM)分析、能谱分析与水样分析。结果表明:氧腐蚀是焊缝局部腐蚀的腐蚀类型,垢下腐蚀是导致焊缝局部腐蚀的主要原因。和母材相比,焊缝耐蚀性较差,腐蚀产物膜更加疏松。焊缝余高造成的湍流以及高的氯离子含量促进了排污管线焊缝区域的局部腐蚀。Corrosion perforation occurred on the weld inner wall of aφ108 mm×5 mm sewage pipeline in an oil field.The analysis of macromorphology,chemical composition,metallographic structure of pipeline,XRD analysis of inner wall extract,SEM scanning microscope analysis of fracture,energy spectrum analysis and water sample analysis were carried out.The results show that oxygen corrosion is the type of local corrosion of weld,and corrosion under scale is the main cause of local corrosion of weld.Compared with that of the base metal,the corrosion resistance of the weld is worse,the corrosion product film is more loose.The turbulence caused by weld reinforcement and the high chloride ion content promote the local corrosion of the weld area of the sewage pipeline.

关 键 词：排污管线 腐蚀穿孔 氧腐蚀 

分 类 号：TG457.6[金属学及工艺—焊接] TG441.7