X65和X80管线钢在大港模拟土壤溶液中的阴极保护参数研究  

Cathodic Protection Parameters of X65 and X80 Pipeline Steels in Dagang Simulated Soil Solution

作　　者：陈迎春[1] 王新华[1] 王翠 王祖全[1] 郑刚[1] CHEN Ying-chun;WANG Xin-hua;WANG Cui;WANG Zu-quan;ZHENG Gang(School of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China;AVIC Hongdu Aviation Industry Group, Nanchang 330024, China)

机构地区：[1]北京工业大学机械工程与应用电子技术学院,北京100124 [2]中航工业洪都集团,南昌330024

出　　处：《表面技术》2018年第6期218-223,共6页Surface Technology

基　　金：国家自然科学基金项目(51471011);北京工业大学"日新人才"培养计划~~

摘　　要：目的为管道安全运行提供支撑。方法通过搭建室内实验系统,基于极化曲线法和电化学阻抗谱法(Electrochemical Impedance Spectroscopy,EIS),对X65和X80管线钢在大港模拟土壤溶液中的阴极保护参数进行系统的实验及理论研究。结果通过分析X65和X80管线钢的极化曲线,发现在大港模拟土壤溶液中,X65管线钢的阴极保护电位范围为-400^-1200 mV,而X80管线钢的阴极保护电位范围为-400^-1150 mV。基于X65和X80管线钢的EIS结果,通过研究电荷转移电阻Rt随阴极极化电位Ee,c的变化趋势,进一步探明在大港模拟土壤溶液中,X65管线钢的析氢电位为-970 mV,最佳保护电位为-850 mV,而X80管线钢的析氢电位为-960 mV,最佳保护电位为-800 mV,从而明确了在大港模拟土壤溶液中,X65管线钢析氢电位小于X80管线钢的析氢电位。结论探明了X65和X80管线钢在大港模拟土壤溶液中的阴极保护参数,发现X65管线钢的析氢电位及最佳保护电位均小于X80管线钢,为X65和X80管线钢的阴极保护提供了一定理论依据。The work aims to provide support for safe operation of pipes. Based upon polarization curve method and electrochemical impedance spectroscopy（EIS）, systematic experimental and theoretical studies were applied to cathodic protection parameters of X65 and X80 pipeline steels in Dagang simulated soil solution by building indoor experimental system. Accordingto the polarization curves, cathodic protection potential of X65 pipeline steel ranged from-400 to-1200 mV, and X80 pipeline steel from-400 to-1150 mV. Relationship between charge transfer resistance Rt and cathodic polarization potential Ee,c was studied based on the EIS results, it was found that hydrogen evolution potential and optimum protection potential of X65 pipeline steel in Dagang simulated soil solution was-970 mV,-850 mV, respectively; and for X80 pipeline steel,-960 mV,-800 mV, respectively. Therefore, it can be concluded that hydrogen evolution potential of X65 pipeline steel was less than that of X80 pipeline steel. Cathodic protection parameters of X65 and X80 pipeline steels are verified in Dagang simulated soil solution, and hydrogen evolution potential and optimum protection potential of X65 pipeline steel are both less than those of X80 pipeline steel. The studies have provided certain theoretical basis for cathodic protection of X65 and X80 pipeline steels.

关 键 词：X65管线钢 X80管线钢 极化曲线 EIS 阴极保护参数 

分 类 号：TG174.41[金属学及工艺—金属表面处理]