工程科学学报，第40卷，第9期：10911098,2018年9月 Chinese Journal of Engineering,Vol.40,No.9:1091-1098,September 2018 DOI:10.13374/j.issn2095-9389.2018.09.010;http://journals.ustb.edu.cn L80钢在高气速湿气环境中冲蚀一腐蚀行为的环路实验 刘国璋”，祝郦伟》，李大朋》，王贝”，胡家元》，贾巧燕”，张雷四，路民旭” 1)北京科技大学新材料技术研究院，北京1000832)国网浙江省电力有限公司电力科学研究院，杭州310014 3)安科工程技术研究院，北京100083 ☒通信作者，Emai:zhanglei(@usth.cdu.cn 摘要利用高温高压湿气环路研究了[80钢在高气相流速湿气环境中的腐蚀-冲蚀行为.利用腐蚀失重法测试了L80挂片 在气速30m·s,含水率0.0007%，C0,分压0.5MPa及55℃的工况下，分别在不同的腐蚀周期下的腐蚀速率.利用激光共聚 焦显微镜对试样表面形貌进行了观察，利用扫描电子显微镜对腐蚀产物形貌进行观察，利用X射线衍射及能谱仪对腐蚀产物 组成进行了分析.结果表明，I80钢在高气相流速湿气环境下腐蚀失重严重，腐蚀后试样表面出现大量的微小蚀坑，随着实验 周期的延长蚀坑会不断长大.该工况下产生的腐蚀产物主要成分为Fe,C和FCO,: 关键词碳钢：环路：高气速：湿气：局部腐蚀 分类号TG172.9 Erosion-corrosion behavior of 180 steel under high velocity wet gas condition by flow loop method LIU Guo-hang',ZHU Li-ei,LI Da-peng》,WANG Bei",HU Jia-yuan2》,JIA Qiao-yan”,ZHANG Lei,LU Min-》 1)Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China 2)State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,China 3)Safetech Research Institute,Beijing 100083,China Corresponding author,E-mail:zhanglei@ustb.edu.cn ABSTRACT With the continuous petroleum extraction from deep-water subsea gas fields,many long distance offshore natural gas pipelines have been constructed.The design parameters directly affect the gas flow velocity in pipelines,which may introduce high wall shear stresses on the pipeline internal wall.Moreover,corrosive medium like CO,HS,O,and Clalways exists in subsea pipelines under high velocity gas flow,which induces erosion-corrosion.Many pipelines in China have entered the middle or late stage of serv- ice,and this has increased the risks and failures induced by erosion-corrosion.Furthermore,more natural gas storages are being built for transportation,which require a high-velocity gas flow for gas injection and production processes.A certain amount of corrosive medi- ums such as residual drilling fluid,hydrochloric acid,condensate water,CO,and H2S can be found in natural gas,and when com- bined with a high gas flow velocity,internal erosion-corrosion might occur in the tubing in downhole systems.In this study,a high tem- perature-high pressure flow loop was applied to investigate the corrosion behavior of 180 steel in a wet gas pipeline with a high gas ve- locity.The extreme conditions created by the flow loop is 30 m's"gas velocity,0.0007%water cut,0.5 MPa CO,partial pressure, and 55 C environmental temperature.Corrosion rates at different testing periods were calculated through weight-loss measurements. Confocal laser scanning microscopy and scanning electron microscopy were applied to observe the corrosion morphology.The corrosion product constituents were analyzed using X ray diffraction and energy dispersive spectroscopy (EDS),and the results reveal that severe corrosion occurs and a large number of micro pits appear on the 180 coupons surfaces.Moreover,instead of an integral corrosion prod- 收稿日期：2017-10-20 基金项目：国家电网公司科技项目(52110417000N):国家重大科技专项资助项目(2016ZX05028004)工程科学学报，第 40 卷，第 9 期: 1091--1098，2018 年 9 月 Chinese Journal of Engineering，Vol． 40，No． 9: 1091--1098，September 2018 DOI: 10． 13374 /j． issn2095--9389． 2018． 09． 010; http: / /journals． ustb． edu． cn L80 钢在高气速湿气环境中冲蚀--腐蚀行为的环路实验 刘国璋1) ，祝郦伟2) ，李大朋3) ，王 贝1) ，胡家元2) ，贾巧燕1) ，张 雷1) ，路民旭1) 1) 北京科技大学新材料技术研究院，北京 100083 2) 国网浙江省电力有限公司电力科学研究院，杭州 310014 3) 安科工程技术研究院，北京 100083 通信作者，E-mail: zhanglei@ ustb． edu． cn 摘 要 利用高温高压湿气环路研究了 L80 钢在高气相流速湿气环境中的腐蚀--冲蚀行为． 利用腐蚀失重法测试了 L80 挂片 在气速 30 m·s － 1，含水率 0. 0007% ，CO2 分压 0. 5 MPa 及 55 ℃的工况下，分别在不同的腐蚀周期下的腐蚀速率． 利用激光共聚 焦显微镜对试样表面形貌进行了观察，利用扫描电子显微镜对腐蚀产物形貌进行观察，利用 X 射线衍射及能谱仪对腐蚀产物 组成进行了分析． 结果表明，L80 钢在高气相流速湿气环境下腐蚀失重严重，腐蚀后试样表面出现大量的微小蚀坑，随着实验 周期的延长蚀坑会不断长大． 该工况下产生的腐蚀产物主要成分为 Fe3C 和 FeCO3 ． 关键词 碳钢; 环路; 高气速; 湿气; 局部腐蚀 分类号 TG172. 9 收稿日期: 2017--10--20 基金项目: 国家电网公司科技项目( 52110417000N) ; 国家重大科技专项资助项目( 2016ZX05028--004) Erosion-corrosion behavior of L80 steel under high velocity wet gas condition by flow loop method LIU Guo-zhang1) ，ZHU Li-wei2) ，LI Da-peng3) ，WANG Bei1) ，HU Jia-yuan2) ，JIA Qiao-yan1) ，ZHANG Lei1)  ，LU Min-xu1) 1) Institute for Advanced Materials and Technology，University of Science and Technology Beijing，Beijing 100083，China 2) State Grid Zhejiang Electric Power Ｒesearch Institute，Hangzhou 310014，China 3) Safetech Ｒesearch Institute，Beijing 100083，China Corresponding author，E-mail: zhanglei@ ustb． edu． cn ABSTＲACT With the continuous petroleum extraction from deep-water subsea gas fields，many long distance offshore natural gas pipelines have been constructed． The design parameters directly affect the gas flow velocity in pipelines，which may introduce high wall shear stresses on the pipeline internal wall． Moreover，corrosive medium like CO2，H2 S，O2，and Cl － always exists in subsea pipelines under high velocity gas flow，which induces erosion-corrosion． Many pipelines in China have entered the middle or late stage of serv￾ice，and this has increased the risks and failures induced by erosion-corrosion． Furthermore，more natural gas storages are being built for transportation，which require a high-velocity gas flow for gas injection and production processes． A certain amount of corrosive medi￾ums such as residual drilling fluid，hydrochloric acid，condensate water，CO2，and H2 S can be found in natural gas，and when com￾bined with a high gas flow velocity，internal erosion-corrosion might occur in the tubing in downhole systems． In this study，a high tem￾perature-high pressure flow loop was applied to investigate the corrosion behavior of L80 steel in a wet gas pipeline with a high gas ve￾locity． The extreme conditions created by the flow loop is 30 m·s － 1 gas velocity，0. 0007% water cut，0. 5 MPa CO2 partial pressure， and 55 ℃ environmental temperature． Corrosion rates at different testing periods were calculated through weight-loss measurements． Confocal laser scanning microscopy and scanning electron microscopy were applied to observe the corrosion morphology． The corrosion product constituents were analyzed using X ray diffraction and energy dispersive spectroscopy ( EDS) ，and the results reveal that severe corrosion occurs and a large number of micro pits appear on the L80 coupons surfaces． Moreover，instead of an integral corrosion prod-