摘要
用动电位极化和电化学阻抗谱测量方法研究了CT80钢连续油管钢在模拟长庆油田高矿化度油井水中的腐蚀行为,并考察了矿化度和预腐蚀对腐蚀过程的影响.结果表明,随着腐蚀溶液矿化度的增大,材料的开路电位正移,电荷传递电阻先减小后增大,电化学腐蚀速率与矿化度呈非直线规律.在矿化度为23.204 g/L时,CT80钢材料具有最大的腐蚀速率.随着预腐蚀时间的延长,电荷传递电阻增大,相应的电化学腐蚀速率有所降低.
Potentiodynamic polarization measurement and electrochemical impendence spectroscopy were employed to investigate the corrosion behavior of CT80 coiled tubing steel in artificial high salinity brine corresponding to the oil well water at Changqing oil field. The effect of salinity and pre-corrosion on the corrosion process was thus examined. The results showed that when salinity was increased, the free corrosion potential moved to the positive direction, the charge transfer resistance resulting from the electrochemical impendence spectroscopy decreased first but then increased, and the nonlinear correlation was observed between the corrosion rate resulting from the polarization measurement and the salinity. The maximum corrosion rate was observed at the moderate salinity of 23.204 g/L. With the increase of the pre-corrosion time, the charge transfer resistance increased, as a result, the electrochemical corrosion rates decreased.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2013年第1期23-29,共7页
Corrosion Science and Protection Technology
基金
西安石油大学全日制硕士研究生创新基金(Ys3703052323)资助
关键词
CT80钢
矿化度
动电位极化
电化学阻抗谱
CT80 steel, salinity, potentiodynamic polarization, electrochemical impendencespectroscopy
