X65钢在高温高压CO_2酸性溶液中的腐蚀行为  

Corrosion Behavior of X65 Steel in Carbon Dioxide Solution under High Temperature and High Pressure

作　　者：周琦[1] 赵红顺[1] 常春雷[1] 张俊喜[1] 臧树俊[1] 

机构地区：[1]兰州理工大学材料科学与工程学院

出　　处：《材料开发与应用》2007年第6期40-44,共5页Development and Application of Materials

基　　金：甘肃省自然科学基金(3ZS062-B25-025)

摘　　要：利用高温高压釜,通过失重法、SEM、XRD以及电子探针微观结构分析等方法,研究了X65钢在四种不同高温条件下及1 MPa分压的饱和CO2的NACE酸性溶液中的腐蚀行为。结果表明:(1)在所研究的温度范围内,X65钢在CO2腐蚀介质中表现出高的腐蚀速率;随着温度的升高,腐蚀速率呈先下降再升高的趋势,90℃时最小;(2)表面生成了FeCO3为主的腐蚀产物膜;(3)CO2腐蚀的作用形成了钢表面点蚀、坑蚀、台地腐蚀特征;(4)Cl-为点蚀的"激发剂",并且在点蚀坑内富集,导致局部Cl-浓度差不同,促进点蚀发生;(5)CO2腐蚀是各种因素相互作用的结果。Corrosion characteristics of X65 steel under four different high temperatures and in NACE solution saturated with COa at 1 MPa partial pressure were investigated by using autoclave, SEM,XRD, weight loss methods and electron-probe micro-analysis. The result showed that in the studied temperature ranges,X65 steel was corroded seriously by CO2. With the temperature increasing,the corrosion rate of X65 steel had a tendency of decreasing first,then inereasing,and the minimum rate appeared at the temperature of 90℃. The main corrosion scale is ferrous sulfide. The effect of CO2 corrosion made the surface of X65 steel have a feature of point corrosion, pitting corrcxsion and mesa corrosion. C1- excited point corrosion and enriched in the pit of point corrosion, which brought the concentration of C1- on part surface of sample different,and accelerated the point corrosion reaction. The corrosion of CO2 was the result of interaction of multi-factors.

关 键 词：CO2 X65钢 腐蚀特征 高温高压 

分 类 号：TG172.63[金属学及工艺—金属表面处理]