Studying the corrosion inhibition of carbon steel in hydrochloric acid solution by 1-dodecyl-methyl-1H-benzo[d][1,2,3]triazole-1-ium bromide

Abstract

A novel cationic surfactant 1-dodecyl-methyl-1H-benzo[d][1,2,3]triazole-1-ium bromide (1-DMBT) was synthesized and its structure was confirmed by using ¹H NMR and FTIR spectroscopic analysis. The surface tension and electrical conductivity of that surfactant were measured and its critical micelle concentration and some of its surface properties also were determined and discussed. The inhibition performance of the prepared (1-DMBT) on the corrosion of carbon steel in 1.0 M HCl solution was investigated at different concentrations and temperatures by using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy. The obtained results revealed that the synthesized (1-DMBT) regards as a good corrosion inhibitor for carbon steel in HCl medium and acts mainly as a mixed-type inhibitor. The inhibition of (1-DMBT) efficiency increases with increasing its concentration but decreases with rise in temperature. Such inhibition is related to the adsorption of the surfactant on the metal surface and the adsorption process obeys the Langmuir isotherm.