管线钢的CO_2腐蚀行为研究  

Study on CO_2 Corrosion Behavior of Pipeline Steel

作　　者：任呈强[1] 曹然伟[1] 郑云萍[2] 柳海[3] 张锋[3] 刘成[3] 

机构地区：[1]西南石油大学材料科学与工程学院,四川成都610500 [2]西南石油大学石油工程学院,四川成都610500 [3]新疆油田公司采气一厂,新疆克拉玛依834000

出　　处：《天然气与石油》2011年第2期58-61,1,共4页Natural Gas and Oil

基　　金：西南石油大学中青年学术骨干和校基金资助(178)

摘　　要：采用电化学方法、失重法和扫描电镜研究了15 CrMo钢、20 G钢和20#钢在模拟集输环境的腐蚀行为。研究表明,三种钢的腐蚀电化学机理相同,腐蚀过程受HCO3-的扩散控制;20#钢的腐蚀产物最疏松多孔,15 CrMo和20 G的腐蚀产物比20#钢对腐蚀的抑制作用好;常压饱和CO2溶液中,20G腐蚀速率最低,但是在升高CO2分压情况下,15 CrMo钢腐蚀速率则最低;HCO-3含量、钢的显微组织和钢的成分共同作用使15 CrMo、20 G和20#钢的腐蚀存在差异。Corrosion behaviors of 15CrMo,20G and 20# steel in stimulated gathering and transportation environmental conditions are researched by using electrochemical method,weight loss method and scanning electron microscope and research results show that electrochemical corrosion mechanisms of the three kind of steels are identical and their corrosion process is controlled by HCOdiffusion.Corrosion product of 20# steel is very loose and porous,corrosion products of 15CrMo and 20G steel have better effect of corrosion inhibition than 20# steel.In saturated CO2 solution under normal pressure condition,20G steel has the lowest corrosion rate and 15CrMo steel has the lowest corrosion rate when the partial pressure of CO2 is increased.Data show that the corrosion difference of 15CrMo,20G and 20# steel is determined by their HCO concentration,microstructures and compositions.

关 键 词：腐蚀 管线钢 电化学 显微组织 

分 类 号：TE988.2[石油与天然气工程—石油机械设备]