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利用极化曲线和电化学阻抗谱研究温度对N80和KO80SS钢在饱和CO2地层水中电化学腐蚀阴阳极过程的影响。结果表明:N80钢和KO80SS钢随成膜温度的升高,腐蚀加剧,腐蚀电位下的电极反应速度分别由阳极和阴极控制。在30℃条件下N80钢的阳极交流阻抗谱显示活化区与腐蚀产物膜覆盖区并存,基体处于腐蚀状态;温度达到60和90℃时,N80钢腐蚀产物膜基本完全覆盖基体表面,KO80SS钢生成的腐蚀产物膜完整均匀;两种钢的阳极腐蚀均受活化控制。两种钢的阴极腐蚀反应均同时受扩散和活化控制,阴极反应以H2CO3、HCO 3-的还原为主,H+的还原占从属地位。
The influence of temperature on electrochemical corrosion of anode and cathode of N80 and KO80SS steels in saturated CO2 formation water was investigated by polarization curves and electrochemical impedance spectroscopy. The results show that the corrosion rate of N80 steel and KO80SS steel increases with the increase of the film formation temperature, and the electrode reaction rate under the corrosion potential is controlled by the anode and the cathode, respectively. The anodic AC impedance spectra of N80 steel at 30 ℃ showed that the active zone coexisted with the coating of corrosion products and the matrix was in a corrosive state. When the temperature reached 60 and 90 ℃, the corrosion film of N80 steel completely covered the surface of the matrix, and KO80SS steel The corrosion products of the film is complete and uniform; both types of steel anodic corrosion control by activation. The cathodic corrosion reactions of both steels were both controlled by diffusion and activation. The cathodic reaction was dominated by the reduction of H2CO3 and HCO3, and the reduction of H + took the dominant position.