Adsorption and corrosion inhibition characteristics of 2–(chloromethyl)benzimidazole for C1018 carbon steel in a typical sweet corrosion environment: Effect of chloride ion concentration and temperature

摘要: Abstract Benzimidazole derivatives are emerging as promising corrosion inhibitors for oil and gas application because they exhibit high efficiency very good environmental profile. Although long alkyl phenyl chains enhance their efficiency, also increase toxicity. Finding benzimidazole devoid of hydrocarbon with lower toxicity has become a priority. 2–(chloromethyl)benzimidazole (CMB), log Po/w = 2.2, been investigated low-toxic sweet inhibitor C1018 carbon steel in CO2–saturated NaCl solution under static condition using experimental theoretical approaches. At 25 °C, Open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP) techniques confirm that CMB is an anodic-type which able to form protective layer on the surface provide inhibition 97.54% at 10 ppm. The increased 98.40% 98.58% upon increasing temperature 40 °C 60 respectively but decreased 96.32% 94.76% salt concentration was raised 5.0% 7.0% NaCl, respectively. latter attributed antagonistic competition between Cl– ions anodic adsorption. CMB–steel interaction facilitated by free electrons around N heteroatoms C bonds, based FTIR analysis computational calculations. This eventually ameliorates degradation during °C. performance highly comparable reported higher values.