TY - JOUR ID - 55732 TI - Thermodynamic and Kinetic Investigations of Corrosion Inhibition Behavior of 2-MBT on Steel at a pH of 8 JO - Iranian Journal of Oil and Gas Science and Technology JA - IJOGST LA - en SN - 2345-2412 AU - Koraee, Hojatallah AU - Eskandari, Hadi AU - Danaee, Iman AD - M.S. Student, Department of Chemical Engineering, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran AD - Assistant Professor, Department of Technical Inspection, Petroleum University of Technology, Abadan, Iran AD - Associate Professor, Department of Technical Inspection, Petroleum University of Technology, Abadan, Iran Y1 - 2019 PY - 2019 VL - 8 IS - 3 SP - 101 EP - 112 KW - polarization KW - Corrosion inhibitor KW - Adsorption KW - Steel DO - 10.22050/ijogst.2018.55732 N2 - Corrosion results in hazardous and expensive damage to pipelines, vehicles, water and wastewater systems, and even home appliances. One of the most extensively practical methods for protecting metals and alloys against corrosion is to use organic inhibitors. The inhibition capability of 2-Mercaptobenzothiazole (2-MBT) against the corrosion of carbon steel in a 2 M NaCl solution was examined by Tafel polarization. By using 2-Mercaptobenzothiazole both the cathodic and anodic reactions are delayed through chemical and physical adsorption and blocking the active corrosion sites. Based on the polarization curves, it was indicated that by increasing the inhibitor concentration, the inhibition efficiency increases up to 70% at room temperature, and it improves at higher temperatures. The adsorption of 2-Mercaptobenzothiazole was based on the Langmuir adsorption isotherm. The enthalpies of activation were determined to be around +50 kJ.mol-1. The endothermic nature of the steel dissolution procedure is reflected by the positive symbols of the enthalpies (ΔH) of activation process. The determined  values range from -32.69 to -35.81 kJ.mol-1, which shows both electrostatic adsorption and the chemisorption of the adsorption mechanism. The calculated entropy of adsorption was 78 J.mol-1.K-1 indicating the increment in the solvent entropy and a more positive water desorption entropy. UR - https://ijogst.put.ac.ir/article_55732.html L1 - https://ijogst.put.ac.ir/article_55732_fd29d40fe5a2dc5d6a794f56019b192b.pdf ER -