采用动电位扫描和交流阻抗技术研究了腐蚀产物膜覆盖条件 下2种油套管钢CO2腐蚀电化学特征.结果表明，油套管钢表面生成腐蚀产物膜以后可以显 著降低腐蚀电流密度，EIS图谱中出现Warburg阻抗特征，含Cr油套管钢CO2腐蚀产物膜对 基体的保护作用要优于N80钢.N80油套管钢在CO2腐蚀过程中的点蚀会使交流阻抗谱出现容 抗弧特征.
The potentiodynamic and electrochemical impedance t echniques were employed to study the electrochemical characteristics of CO2 co rrosion of two kinds of well tube steels with corrosion scales.The results showe d that after corrosion scale formed on well tube steels,corrosion curre nt density would decrease observably,the character of Warburg impedance could be found in electrochemical impedance spectra and the protection of corrosion scal e of Cr-containing well tube steel was better than N80 steel mainly because the porosity of Cr-containing well tube steel was lower then that of N80 steel.Becau se of the pitting electrode process of N80 steel,the capacitance loop would pres ent itself in EIS at low frequency range.
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