N80钢在川西某气井常温常压和高温高压下的腐蚀行为  

Corrosion Behavior of N80 Pipeline Steel under Conditions of Normal Temperature and Pressure as well as High Temperature and Pressure in a Gas Well of Western Sichuan

作　　者：李言涛[1] 张玲玲[2] 侯保荣[1] 

机构地区：[1]中国科学院海洋研究所腐蚀与防护中心,山东青岛266071 [2]兖矿集团有限公司,山东邹城273500

出　　处：《材料保护》2011年第1期64-66,9,共3页Materials Protection

基　　金：中国科学院知识创新工程重要方向项目(No.KZCX2-YW-210);国家科技支撑计划项目(2007BAB27B01)

摘　　要：管道钢在高温高压环境中的热力学条件和腐蚀动力学过程不同,因而其腐蚀规律及机理与常温常压下有很大不同。利用电化学方法研究了N80管道钢在川西某气井含饱和CO2的腐蚀介质中于常温常压和高温高压环境下的极化曲线和交流阻抗特征,通过对比发现:2种环境下的阳极反应机理相同而阴极反应机理不完全一样;高温高压条件下N80钢的腐蚀速率明显高于常温常压条件下的,电位则要更正;2种条件下的交流阻抗谱不同,常温常压下的EIS曲线由高频容抗弧和低频感抗弧组成,而高温高压条件下的EIS曲线出现了双容抗弧,且其高频容抗弧半径相对常温常压下的明显小了很多,在高温高压条件下H+更多地参与了阴极还原过程。Electrochemical methods were used to comparatively measure the polarization curves and electrochemical impedance spectra of N80 pipeline steel in corrosive medium of a gas well of western Sichuan under conditions of normal temperature and pressure as well as high temperature and pressure.It was found that under the two conditions the anodic reaction mechanisms were the same while the cathodic reaction mechanisms were different.The corrosion rate of N80 steel under the high temperature and pressure condition was obviously higher than that under the normal temperature and pressure.Besides,the electrochemical impedance spectrum of the N80 steel under normal temperature and pressure consisted of high frequency capacitance arc and low frequency inductance arc,while that under high temperature and pressure contained double capacitance arcs,and the radius of the high frequency capacitance arc under high temperature and pressure was evidently smaller than that under normal temperature and pressure.Moreover,more H+ took part in the cathodic depolarization process under high temperature and pressure.

关 键 词：CO2腐蚀 气井 N80钢 高温高压 电化学 反应机理 

分 类 号：TG172[金属学及工艺—金属表面处理]