摘要
基于腐蚀电化学理论,以油井管材料P110钢为研究对象,在CS电化学工作站实验装置上,开展了不同温度、不同浓度Cl^-和CO_2共存时复杂离子环境对于油井管材料的电化学腐蚀研究。通过实验可以大致得出这种材料的最适工况环境保证材料的使用寿命,为提高生产安全系数提供参考。研究表明:在某一个固定的腐蚀介质中,P110钢的腐蚀速率是随温度增加而增加的;而在同一温度下,共存离子环境中的Cl^-浓度直接影响腐蚀速率,会在某个Cl^-浓度区间对于P110钢在共存离子环境的腐蚀速率产生抑制作用。在室温(20℃)时,P110腐蚀状态最为稳定缓慢,此状态下Cl^-浓度的增加会抑制P110钢的电化学腐蚀作用;NaCl在1.5wt%~3.5wt%之间会抑制P110钢的电化学腐蚀作用,使用寿命最长,最适合工程使用。
Based on the theory of corrosion electrochemistry, the electrochemical corrosion of oil well pipe material was studied on the CS electrochemical workstation experimental device. The electrochemical corrosion of oil well pipe material was studied at different temperature and different concentrations of Cl- and CO2. The Through the experiment, we can get the optimum working condition of the material to ensure the service life of the material, and provide reference for improving the production safety factor. The results show that the corrosion rate of P110 steel increases with the increase of temperature in a fixed corrosive medium. At the same temperature, the Cl- concentration in the coexisting ion environment directly affects the corrosion rate, The concentration interval has an inhibitory effect on the corrosion rate of P110 steel in coexisting ion environments. At room temperature （20℃）,P110 corrosion state is the most stable and slow, this state Cl- concentration increase will inhibit the electrochemical corrosion of P110 steel; NaCl 1.5wt%～3.5wt% will inhibit the P110 steel electrochemical Corrosion, the longest life, the most suitable for engineering use.
出处
《全面腐蚀控制》
2017年第6期39-43,共5页
Total Corrosion Control
关键词
电化学腐蚀
油井管
腐蚀速率
极化曲线
electrochemical corrosion
oil well pipe
corrosion rate
polarization curve
