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利用极化曲线和电化学阻抗,结合扫描电镜和能谱分析,对20号钢在90℃HCl-H2S-H2O溶液中的腐蚀行为进行了研究。结果表明,当溶液中存在H2S时,电极表面形成的FeS膜对HCl的侵蚀具有一定的阻碍作用;随H2S浓度的增加,膜电阻、电荷转移电阻逐渐减小,说明膜的致密性下降,腐蚀加重;当溶液中HCl较高时,FeS膜出现脱落现象,且随着HCl浓度的增加,膜的致密性逐渐降低,保护作用下降,导致腐蚀速率增加。
The corrosion behavior of No. 20 steel in HCl-H2S-H2O solution at 90 ℃ was studied by using polarization curves and electrochemical impedance spectroscopy combined with SEM and EDS. The results show that when H2S is present in the solution, the FeS film formed on the surface of the electrode has a certain impediment to the erosion of HCl. With the increase of H2S concentration, the membrane resistance and charge transfer resistance decrease gradually, indicating that the membrane densification decreases and corrosion When the concentration of HCl in the solution is higher, the FeS film appears to drop off. With the increase of HCl concentration, the densification of the film gradually decreases and the protection effect decreases, resulting in the increase of the corrosion rate.