X65钢在CO_2饱和油田水中的电化学行为和腐蚀机理  

Electrochemical Behavior and Corrosion Mechanism of X65 Steel in CO_2-saturated Oilfield Water

作　　者：柴成文[1] 张国安[1] 路民旭[1] 

机构地区：[1]北京科技大学腐蚀与防护中心,北京100083

出　　处：《腐蚀与防护》2008年第2期55-58,共4页Corrosion & Protection

基　　金：国家自然科学基金重点资助项目(50231020)

摘　　要：利用热力学计算方法推断X65钢在CO2饱和模拟油田水中的腐蚀反应阳极机制。结果显示X65钢在CO2饱和模拟油田水中的腐蚀包含两种阳极反应,即Fe接受电子转变为Fe2+和Fe与HCO3-反应形成FeCO3。实验条件下Fe与水作用生成Fe(OH)2的反应的平衡电位高于自腐蚀电位,因此难以进行。通过电化学阻抗谱测试进一步证实了热力学计算的结果。Mechanism of anodic reaction of X65 steel in CO2-saturated oilfield water was inferred from thermodynamic calculation.It was found that X65 steel was corroded through both reactions Fe→Fe2++2e and Fe+HCO-3→FeCO3+H++2e.Under the experimental condition,the reaction Fe+2H2O→Fe(OH)2+2H++2e could not take place because its equilibrium electrode potential was higher than the free corrosion potential of the steel.EIS results were consistent with the result of thermodynamic calculation.

关 键 词：CO2腐蚀 油田水 腐蚀机理 电化学阻抗谱 

分 类 号：TG172[金属学及工艺—金属表面处理]