利用EIS等技术研究了常温常压下P110油管钢在模拟油田采出液中受CO2腐蚀的电化学行为。结果表明：附加的阴极反应—H2CO3的直接还原，是导致CO2条件下的活性溶解腐蚀比相同pH的强酸腐蚀更为严重的主要原因；模拟介质中的阳极活性溶解过程遵循“pH依赖机理”，阴极反应则包括H+的还原、H2CO3的还原、HCO3-的还原和H2O的还原。
EIS and other techniques were used to study the behavior of steel P110 in CO2-containing simulated oilfield brine at room temperature and pressure.It was found that the most important reason of H2CO3 being more corrosive than a xompletely dissociated acid resulted from an additional cathodic reaction:the direct reduction of H2CO3.The impedance spectra at both open circuit potential and anodic potential presented a typical character of three time constants:a capacitive semicircle was followed by an inductuve and a small capacitive demicircle at low frequencies.This and other obxervations suggested that the active dissloution of steel P110 at relatively lower pH in the simulated fluid took place by "pH-dependent mechanism".The cathodic reactions mainly included H+ reduction,direct H2CO3 reduction,HCO3 reduction and direct H2O reduction.The dominance of four reactions in cathodic current changed with pH of the media
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