高温埋地输送管道缓蚀剂防腐措施研究  

Study on corrosion protection of corrosion inhibitor for high temperature buried pipeline

作　　者：吕祥鸿[1] 刘妍妍 程猛猛 赵凯峰[3] 姜毅 李宁 王晨 Lü Xianghong;LIU Yanyan;CHENG Mengmeng;ZHAO Kaifeng;JIANG Yi;LI Ning;WANG Cheng(School of Materials Science and Engineering,Xi an Shiyou University,Xi an,Shaanxi,710065,China;PetroChina Xinjiang Oilfield Oil&Gas Storage and Transportation Company,Karamay,Xinjiang,831100,China;PetroChina Changqing Oilfield No.2 Oil Production Plant,Qingyang,Gansu,745100,China;PetroChina Changqing Oilfield Oil&Gas Process Research Institute,Xi an,Shaanxi,710003,China)

机构地区：[1]西安石油大学材料科学与工程学院,陕西西安710065 [2]中国石油新疆油田油气储运分公司,新疆克拉玛依831100 [3]中国石油长庆油田第二采油厂,甘肃庆阳745100 [4]中国石油长庆油田油气工艺研究院,陕西西安710003

出　　处：《天然气与石油》2021年第1期94-100,共7页Natural Gas and Oil

基　　金：国家自然科学基金青年科学基金项目(51902254);陕西省自然科学基础研究计划(2016JM5064,2018JQ5108);西安石油大学“材料科学与工程”省级优势学科(YS37020203)。

摘　　要：通过固体缓蚀剂的释放率测试、缓蚀效果评价,结合线性极化、动电位极化和交流阻抗图谱(EIS)等电化学测试分析,探讨其缓蚀作用机理及在高温埋地输送管道防护中的适用性。结果表明:在管输工况条件下,固体缓蚀剂释放时间为33 d。当固体缓蚀剂加药量为5000 mg/L时,可以显著降低T/S-52K钢的腐蚀速率,在模拟管输工况条件下,其缓蚀效率为89.16%。添加固体缓蚀剂后,T/S-52K钢的极化电阻R_(p)迅速升高,电极反应阻力增大,自腐蚀电位显著正移,腐蚀速率明显降低;缓蚀剂成相膜层主要通过阻滞阴极电化学反应,发挥缓蚀作用。固体缓蚀剂的释放组元可在金属表面形成"成相的"膜层,随着腐蚀时间的延长,缓蚀剂成相膜层的膜阻R_(m)显著增大。通过简单有效的评价方法得到固体缓蚀剂的释放速率及最佳加药量,对固体缓蚀剂的实际应用具有指导意义。The solid-form corrosion inhibition mechanism and its applicability in high temperature buried pipeline protection were discussed,via the releasing rate test,inhibition effectiveness evaluation,and the electrochemical test&analysis of linear polarization,dynamic potential polarization and EIS.The results showed that the releasing time of the solid inhibitor was 33 d under the pipeline operating condition.When the concentration of solid-form corrosion inhibitor was 5000 mg/L,the corrosion rate of T/S-52 K steel can be significantly reduced,and the inhibition effectiveness was 89.16%under the simulated pipeline operating condition.After injecting the solid-form corrosion inhibitor,the polarization resistance Rp of T/S-52 K steel increased rapidly,the reaction resistance of the electrode increased,the corrosion potential moved forward significantly,and the reduction in corrosion rate was obvious.The film of corrosion inhibitor played a role of corrosion inhibition mainly by blocking the cathodic electrochemical reaction.The release components of the solid-form corrosion inhibitor can form a"phase forming"film on the metal surface,and the membrane resistance R_(m)of the corrosion inhibitor film increased significantly with the extension of the corrosion time frame.From the simple but effective assessment method,the derived release rate and optimum dosage of solid-form corrosion inhibitor can be used as a reference for actual implementation of this type of inhibitor.

关 键 词：固体缓蚀剂 释放率 缓蚀效果 电化学测试 缓蚀机理 

分 类 号：TE988.2[石油与天然气工程—石油机械设备]