The inhibition performance of a mixture of an imidazoline quaternary ammonium salt (IM) and octylphenol polyoxyethene ether (OP) (IMO) toward carbon dioxide (CO₂) corrosion of L245 steel in 3 wt% sodium chloride (NaCl) solution at 25°C was studied using electrochemical measurements. Notably, the inhibition efficiency of the IMO inhibitor stayed steadily in the long-term immersion test, and the inhibition efficiency increased with time. This was attributed to the improved electron-transfer performance between the inhibitor molecules and the metal surface. OP molecules promoted electrons to the metal, while IM molecules accepted electrons from the metal. The interactions between the inhibitor molecules and metal surface were enhanced, and the relative bonding intensities were improved. Moreover, the adsorption configurations of the mixture of IM and OP facilitated the improvement of the thickness and the compactness of the inhibitor layer. OP and IM showed a good synergistic inhibition effect.

中文翻译：

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基于增强电子转移的抑制剂混合物的协同作用

咪唑啉季铵盐 (IM) 和辛基酚聚氧乙烯醚 (OP) (IMO) 的混合物对二氧化碳 (CO ₂ ) 的抑制性能) 使用电化学测量研究了 L245 钢在 25°C 的 3 wt% 氯化钠 (NaCl) 溶液中的腐蚀。值得注意的是，IMO抑制剂的缓蚀效率在长期浸泡试验中保持稳定，且缓蚀效率随时间增加。这归因于抑制剂分子与金属表面之间的电子转移性能的提高。OP 分子将电子促进到金属，而 IM 分子从金属接受电子。缓蚀剂分子与金属表面的相互作用增强，相对键合强度提高。此外，IM和OP混合物的吸附构型促进了抑制剂层的厚度和致密性的提高。OP和IM表现出良好的协同抑制作用。