Synthesis and performance study of symmetrical dimeric imidazoline corrosion inhibitors with varying carbon chain lengths
Using lauric acid,myristic acid,palmitic acid,stearic acid,and tetraethylenepentamine as pri-mary raw materials,with a molar ratio of 1∶1.2,amidation was conducted for 4 h at 150 ℃ followed by cyclization for 4 h at 190 ℃.Subsequently,benzyl chloride was added for material modification at a molar ratio of 1∶1.2,with a reaction time of 10 h at 80 ℃.This process yielded double symmetric imidazoline corrosion inhibitors with alkyl chain lengths of C11(LIRQ),C13(MIRQ),C15(MIRQ),and C17(PIRQ).Functional group structures were characterized using infrared spectroscopy.The corrosion inhibi-tion performance was studied by static weight loss experiments,electrochemical polarization curves,and observation of sample surface morphology using transmission electron microscopy.The weight loss experi-ments and polarization curve results demonstrate that in a 1 mol/L HCl medium,as the alkyl chain length increases,the corrosion inhibitor concentration,and experimental temperature gradually increase,leading to an enhanced corrosion inhibition rate.Through linear simulation,it was found that these inhibitors chemically adsorb on the metal surface and follow the Langmuir adsorption isotherm equation.
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