地面管网含硫酸性腐蚀环境用缓蚀剂的性能与作用机制  

Performance and Action Mechanism of Corrosion Inhibitors Used in Sulfuric Acid Corrosive Environment of Ground Pipe Network

作　　者：李薛 孙振华 周海刚 魏旭 周兆院 刘晶姝 LI Xue;SUN Zhenhua;ZHOU Haigang;WEI Xu;ZHOU Zhaoyuan;LIU Jingshu(Technology Inspection Center,Shengli Oilfield Branch Company,Sinopec,Dongying,Shandong 257000,P R of China;Shengli Oilfield Inspec-tion and Evaluation Company Ltd.,Dongying,Shandong 257000,P R of China)

机构地区：[1]中国石油化工股份有限公司胜利油田分公司技术检测中心,山东东营257000 [2]胜利油田检测评价研究有限公司,山东东营257000

出　　处：《油田化学》2023年第3期509-515,533,共8页Oilfield Chemistry

基　　金：中国石油化工股份有限公司科技项目“高含硫油藏开发安全保障关键技术研究”(项目编号321034)。

摘　　要：为了改善地面管网含硫酸性高温环境的腐蚀问题,用微波法合成了一种N掺杂碳点缓蚀剂NCDs,采用电化学和失重法测试了NCDs在25、60、90℃下对N80钢片在模拟溶液中的缓蚀作用。结果表明,在相同NCDs浓度下,随温度的升高,缓蚀效率降低。在25℃下,缓蚀剂NCDs质量浓度为150 mg/L时的缓蚀效率达到最大,达94.16%;在60℃下,NCDs质量浓度为200 mg/L时的缓蚀效率最大,为82.92%;在90℃下,NCDs质量浓度为150 mg/L时缓蚀效率达到69.59%。对腐蚀形貌分析发现90℃时,钢片表面的腐蚀坑深度和数目最多。吸附等温曲线表明,NCDs在90℃时吸附平衡常数最大,但高温会使其局部腐蚀更严重。此外发现N掺杂碳点的吸附类型为物理与化学混合吸附。该碳点缓蚀剂可有效解决地面管道高温下的腐蚀,延长使用寿命。An N-doped carbon dots corrosion inhibitor was synthesized by microwave method to improve the corrosion problem of ground pipe network under sulfur-containing acidic high-temperature environment.Its corrosion inhibition effect on N80 carbon steel in simulated solution at 25℃,60℃and 90℃was tested by electrochemical and weight loss methods.The results showed that the efficiency of corrosion inhibitor(ECI)increased with the increase of the temperature.The ECI reached the maximum of 94.16%at the temperature of 25℃at the NCDs dosage of 150 mg/L.The maximum was 82.92%at the temperature of 60℃at the NCDs dosage of 200 mg/L.At the temperature of 90℃and at the NCDs dosage of 150 mg/L,it reached up to 69.59%.The analysis of corrosion morphology showed that the depth and number of corrosion pits on the steel were the largest at the temperature of 90℃.The adsorption isotherm curve showed that the adsorption equilibrium constant of NCDs was the largest at 90℃,but the local corrosion was more serious at high temperature.In addition,it is found that the adsorption type of N-doped carbon dots was physical and chemical mixed adsorption.The carbon dots corrosion inhibitor could effectively solve the corrosion of ground pipelines at high temperature and prolong the service life.

关 键 词：地面管网 腐蚀 缓蚀剂 N80钢 失重 

分 类 号：TE988.2[石油与天然气工程—石油机械设备]