Synthesis and Inhibition Performance of Two Imidazoline Corrosion Inhibitors with Different Hydrophilic Groups

Imidazoline quaternary ammonium salt (IM) was synthesized in this paper by maize oil, 2-(aminoethylamino) ethanol and benzyl chloride. Then it was modified by urea and thiourea to obtain IM-O and IM-S respectively. The products were analyzed with IR spectrum and 1HNMR spectrum. The corrosion inhibition performance of IM-O and IM-S was evaluated by weight-loss measurement of A3 steel in hydrochloric acid. The compare research in the concentrations of the corrosion inhibitor, the concentrations of hydrochloric acid, the temperature of pickling, the time of pickling and the concentrations of Fe3+ were done. The results show that the two compounds are good inhibitors for A3 steel and the IM-O has stronger corrosion inhibiting ability than IM-S.