Saba Safayi - Researcher at Energy Storage Group
Abdolhossein Jahanmiri - Prof. of Chemical Engineering; School of Chemical and Petroleum Engineering, Shiraz University, Shiraz 71348-15939, Iran;
Sholeh Farshadfar - Head of Process and Mechanic Group; Institude of Mechanic,Iranian Space Research Center, Shiraz 71345, Iran

Five blends namely BCPI (benzalkonium chloride 50 wt% solution + potassium iodide), COPI (caster oil polyethylene glycol ether + potassium iodide), EAPI (ethanoic acid + potassium iodide), MBPI (methylbenzene + potassium iodide) and CI-113 (a multi-component corrosion inhibitor comprising benzalkonium chloride 50 wt% solution, caster oil polyethylene glycol ether, ethanoic acid, methylbenzene, and potassium iodide) were evaluated as corrosion inhibitor for carbon steel (N-80) in hydrochloric acid (HCl) by using various chemical and electrochemical methods. CI-113 was found to be the best corrosion inhibitor at concentration of 5000 ppm. Our results demonstrate that percentage of inhibition efficiency (IE%) will be increased by increasing in concentration of CI-113 and temperature, and will be decreased by increasing in HCl concentration and immersion time. CI-113 behaves as a mixed-type inhibitor and its adsorption obeys Temkin s adsorption isotherm

Corrosion, Carbon steel, Electrochemical impedance spectroscopy, Scanning electron microscopy