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Studied on the CO_2 corrosion behabior of P110 steel at high temprature and high pressure

MIAO Jian~1,BAI Zhen-quan~(1,2),ZHAO Xin-wei~1(1.The Key Lab for Mechanical and Environment Behavior Research,CNPC,Xi'an 710065,China;2.Institute of Material Science and Engineering,Xi'an Jiaotong University,Xi'an 710049,China)  
The corrosion behaviors of P110 steel at the stimulated environments of oil field have been systematically studied with mass loss ,components analytical methods,electrochemical impedance spectroscopy(EIS) and polarization curves.The results show that the corrosion rate gradually reduces with the increase of experimental time.The tendency of corrosion reducing rate becomes very slow as 72 hours of experimental time passed.The phenomena similar to passivation for P110 steel will be taken place on the anodic polarization curves.When Tafel slopes of the cathodic polarization curves change greatly,the tendency of cathodic reaction for P110 steel has been different.
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