Abstract
The inhibition properties of 2-mercaptobenzimidazole (MBI) and its synergism with oleic imidazoline (OIM) for carbon steel in CO2-saturated brine solution were investigated by electrochemical, weight loss measurements, surface analysis and quantum chemical calculations. The effectiveness of MBI for OIM was also compared to the other sulfur-containing corrosion inhibitors such as 2-mercaptothanol (ME), mercaptoacetic acid (TGA), and thiourea (TU). The results show that a mixture of MBI and OIM gave a better synergistic corrosion inhibition than that of ME, TGA, and TU. OIM is protonated and coupled with MBI by hydrogen bonding to co-adsorb on the carbon steel surface. MBI adsorbs on Fe by a bidentate bindingNSbridge connection, which effectively prevents the carbon steel from CO2 corrosion.
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