咪唑啉季铵盐的合成及其在CO2腐蚀环境中的缓蚀性能

分别使用硫酸二乙酯、氯化苄和冰醋酸三种季铵化试剂对由油酸、二乙烯三胺合成的咪唑啉进行季铵化，使用动态失重法对比了它们在CO2腐蚀环境中对Q235钢的缓蚀性能，并用电化学方法研究了缓蚀机理。结果表明：使用硫酸二乙酯合成的咪唑啉季铵盐BMI-D比其他两种咪唑啉季铵盐具有更好的缓蚀效果；BMI-D与烷基酚聚氧乙烯醚的最佳质量分数配比为2∶1时可制得复合缓蚀剂BMI-DA，当BMI-DA质量浓度为100mg/L时，缓蚀率可达到97.55%；BMI-DA是以控制阳极过程为主的混合型缓蚀剂。

Synthesis of an imidazoline quaternary ammonium salt and its corrosion inhibition in CO2 corrosive systems

An imidazoline derivative synthesized using oleic acid and diethylenetriamine was quaternized separately by diethyl sulfate, benzyl chloride and acetic acid. The inhibition performances of three imidazoline quaternary ammonium salts were evaluated using a dynamic weight loss method in CO₂-containing brine water and the inhibition mechanism was investigated using electrochemical techniques. The results showed that the imidazoline quaternized by diethyl sulfate (BMI-D) possessed the best inhibition performance. For the optimum blended ratio of the imidazoline quaternary ammonium salt BMI-D and a surfactant (alkyl phenol polyoxyethylene ether) of 2∶1, a compound inhibitor BMID-A was obtained whose inhibition efficiency reached 97.55% when the concentration of BMI-DA was 100mg/L. BMI-DA was shown to be a mixed-type inhibitor preferentially restraining the anodic process of corrosion.