Synthesis and inhibition study of carbon steel corrosion in hydrochloric acid of a new surfactant derived from 2-mercaptobenzimidazole

In this paper,we report a new surfactant (1-tetradecyl-2-(tetradecylthio)-1h-benzimidazole (t1)) derived from 2-mercaptobenzimidazole acting as a carbon steel corrosion inhibitor was synthesized. the molecule structure was confirmed by means of chemical ionization of mass spectrometry,1h and 13c nuclear magnetic resonance. eis and potentiodynamic polarization measurements as well as scanning electron microscopy were used to evaluate the corrosion inhibition of t1 for c-steel in hcl. the results of eis indicate the increase of transfer resistance with the increase of inhibitor concentration. electrochemical measurements indicate that t1 is a mixed type inhibitor. it has been found that the studied compounds adsorb onto carbon steel according to the modified langmuir adsorption isotherm and the kinetic/thermodynamic isotherm of el-awady. the inhibition mechanism was explored by the potential of zero charge (epzc) measurement at the solution/metal interface. dynamic simulation indicates the possibility of gradual substitution of water molecules from the surface of iron surface.