目的：寻找新型缓蚀剂，以解决碳钢在气井采出水中的腐蚀问题。方法以N80钢在80℃气井采出水中的腐蚀为研究对象，通过极化曲线和电化学阻抗谱，研究曼尼希碱与硫脲进行复配的缓蚀效果，并探讨缓蚀协同作用机理。结果硫脲是一种混合型缓蚀剂，对N80钢的阴极过程和阳极过程都有强烈的抑制作用；曼尼希碱是一种以抑制阴极为主的混合型缓蚀剂。二者复配后，对N80钢在气井采出水中的腐蚀表现出优异的缓蚀协同效应，当曼尼希碱添加量为0.75%，硫脲的质量浓度为2.5 mg/L时，缓蚀效果最好。结论曼尼希碱与硫脲二者复配使用时，在N80钢表面可能形成一种双层结构的吸附膜，内层以硫脲为主，外层以曼妮希碱为主。
Objective To find new inhibitors of carbon steel corrosion in gas-field wastewater. Methods The synergistic inhibi-tion effect of mannich ( MABS) and thiourea ( TU) on N80 carbon steel in corrosion system of gas-field wastewater was investigated by using polarization curves and electrochemical impedance spectroscopy ( EIS) . Results The results showed that TU had strong in-hibition effect on the anodic and cathodic processes of N80 steel corrosion, while MABS acted as mixed-type inhibitor preferentially restraining the cathodic process of metal. The combination of MABS and TU showed excellent synergistic inhibition effect in gas-field wastewater. When the Mannich and thiourea concentration was 0. 75% and 2. 5 mg/L, respectively, the inhibition effect was the best. Conclusion When using the combination of MABS and TU, a bi-layer inhibitor film with the inner layer of TU molecules and the outer layer of mannich molecules was formed on the N80 steel surface.
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