Corrosion Behavior of X65 Steel in Carbon Dioxide Solution under High Temperature and High Pressure
-
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。Abstract: Corrosion characteristics of X65 steel under four different high temperatures and in NACE solution saturated with CO2 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 increasing,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 corrosion and mesa corrosion.Cl- excited point corrosion and enriched in the pit of point corrosion,which brought the concentration of Cl- on part surface of sample different,and accelerated the point corrosion reaction.The corrosion of CO2 was the result of interaction of multi-factors.
-
Key words:
- CO2 /
- X65 /
- Corrosion rate /
- High-temperature high-pressure
点击查看大图
计量
- 文章访问数: 3
- HTML全文浏览量: 3
- PDF下载量: 0
- 被引次数: 0