关键词: 咪唑啉, 缓蚀剂, 合成条件, 锅炉水

Abstract: An imidazoline corrosion inhibitor was synthesized from diethylenetriamine and oleic acid using dimethylbenzene as a water carrying agent, and the synthetic reaction conditions, molecular structure and corrosion inhibiting capability to boiler water system were studied. Results show that the optimized parameters for the synthesis is as follows: the molar ratio of oleic acid to diethylenetriamine is 1∶1.4, the volume ratio of dimethylbenzene to reacting mixture is 1∶5 , temperature is programmed raised from 145 ℃ to 210 ℃, the reflux time is 8 h. under the optimum conditions, the yield is up to 96.5%, corrosion inhibition efficiencies on carbon steel is over 90% with imidazoline derivative concentration of 20 mg/L in boiler solutions．The imidazoline derivative was found to inhibit anode corrosion reactions greatly, and also to inhibit cathode corrosion to some extent, so it can be classified as a passivating anodic-type corrosion inhibitor. The mechanism of corrosion inhibition relies on the strong absorption of the imizadoline on metal surfaces which can prevent metal surface from contacting with water．

Key words: Imidazoline, Corrosion inhibitor, Synthetic conditions, Boiler solution