通过动电位极化曲线和电化学阻抗谱(EIS)的测试, 研究了高矿化度溶液中矿化 度对J55钢CO2腐蚀电化学行为的影响. 结果表明: 在高矿化度介质中, J55钢的 CO2腐蚀为阴极控制. 随溶液矿化度增大, 腐蚀电位正移, 腐蚀速率先升高, 后 降低, 当矿化度为62.423 g/L时, 腐蚀速率最大. 随溶液矿化度增加, J55钢的 CO2腐蚀由电化学步骤控制转变为传质和电化学步骤混合控制, 并且矿化度越 高, 传质控制越明显. J55钢的电化学阻抗谱呈现3个时间常数, 即高频容抗弧、 低频感抗弧和低频容抗弧. 随溶液矿化度增大, 电荷传递电阻先减小后增大, 在 62.423 g/L左右出现极小值.
The potentiodynamic polarization and electrochemical impendence spectroscopy (EIS) techniques were employed to analyze the effect of salinity on electrochemical characteristics of J55 steel in high salinity CO2 brines. The results show that the CO2 corrosion mechanism of J55 steel is cathode control, corrosion rates increase as brine salinity increases from 12485ppm to 62423ppm, then decreases as the brine salinity increases from 62423ppm to 407997ppm. With increase of brine salinity, the corrosion potential shifts positively and the corrosion mechanism changes from electrochemical steps control to mixed mass transfer – electrochemical steps control. The higher the salinity is, the more obvious the mass transfer control is. The EIS plots present three time constants: capacitance loop in high frequency, inductance and capacitance loops in low frequency. The charge transfer resistance (Rt) decreases with brine salinity up to 62423ppm, then increases above 62423ppm. There are a minimum of Rt and a maximum of corrosion rates at about 62423ppm.
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