Imidazoline quaternary-ammonium-salt corrosion inhibitor and thioureido-imidazoline quaternary-ammonium-salt compound corrosion inhibitor were synthesized using oleic acid, diethylenetriamine, benzyl chloride, and thiourea as the raw materials. The resulting samples were characterized by static weight-loss method, electrochemical polarization curve, X-ray photoelectron spectrometry (XPS), and scanning electron microscope (SEM). The electrochemical characteristics of the inhibitors' inhibition towards carbon dioxide corrosion were investigated, the major constituents of the protective film formed on the surface of A3 carbon steel by thioureido-imidazoline compound corrosion inhibitor were analyzed, and the corrosion inhibiting mechanism for thioureido-imidazoline in hypersaline was explored. The results indicated that thioureido-imidazoline compound corrosion inhibitor had better corrosion inhibiting effect than imidazoline and can efficiently inhibit the corrosion of A3 carbon steel by CO₂-saturated hypersaline water.

中文翻译：

---

咪唑啉复合缓蚀剂缓蚀性能研究

以油酸、二乙烯三胺、氯化苄、硫脲为原料，合成了咪唑啉季铵盐缓蚀剂和硫脲基咪唑啉季铵盐复合缓蚀剂。所得样品通过静态失重法、电化学极化曲线、X射线光电子能谱（XPS）和扫描电子显微镜（SEM）进行表征。研究了缓蚀剂抑制二氧化碳腐蚀的电化学特性，分析了硫脲基咪唑啉复合缓蚀剂在A3碳钢表面形成的保护膜的主要成分，以及硫脲基咪唑啉的缓蚀机理。探索了高盐度。_2-饱和超盐水。