Institute for Color Science and Technology (ICST) Progress in Color, Colorants and Coatings 2008-2134 17 4 2024 10 01 Corrosion Inhibition of Mild Steel in HCl Solution by 2-acetylpyrazine: Weight Loss and DFT Studies on Immersion Time and Temperature Effects 333 350 81984 10.30509/pccc.2024.167231.1261 EN A.N. Jasim Department of Materials Engineering, Diyala University, P.O. Box: 32001, Diyala, Iraq A. Mohammed Department of Electromechanical Engineering, University of Technology, P.O. Box: 10001, Baghdad, Iraq A. M. Mustafa Department of Production Engineering and Metallurgy, University of Technology, P.O. Box: 10001, Baghdad, Iraq F. F. Sayyid Department of Production Engineering and Metallurgy, University of Technology, P.O. Box: 10001, Baghdad, Iraq H. S. Aljibori College of Engineering, University of Warith Al-Anbiyaa, Karbalaa, P.O. Box: 56001, Iraq W. K. Al-Azzawi Department of Medical Instruments Engineering Techniques, Al-Farahidi University, P.O. Box:10001, Baghdad, Iraq A. A. Al-Amiery Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, University Kebangsaan Malaysia (UKM), P.O. Box: 43000, Selangor, Malaysia Energy and Renewable Technology Centre, University of Technology, P.O. Box: 10001, Baghdad, Iraq E. A. Yousif Department of Chemistry, College of Science, Al-Nahrain University, P.O. Box: 10001, Baghdad, Iraq Journal Article 2023 11 26 This study systematically explores the corrosion inhibition potential of 2-acetylpyrazine for mild steel in a hydrochloric acid (HCl) solution, employing a comprehensive approach that integrates experimental weight loss measurements and Density Functional Theory (DFT) calculations. Investigating inhibitory performance across varying immersion times, inhibitor concentrations, and temperatures, our research aims to elucidate the corrosion inhibition mechanism. Numerical findings highlight a substantial inhibitory efficiency of 92.7 % at an inhibitor concentration of 0.5 mM, an immersion time<br />of 5 hours, and a temperature of 303 K. Remarkably, the efficiency increases to <br />98.1 % after extending the immersion time to 48 hours at 303 K with the same inhibitor concentration. Furthermore, we demonstrate the temperature's impact on inhibition efficiency, reaching 97.3 % at 333 K with an immersion time of 5 hours and an inhibitor concentration of 0.5 mM. The Langmuir model, applied to adsorption isotherms, provides valuable insights into the adsorption behavior of 2-acetylpyrazine on mild steel surfaces. Additionally, scanning electron microscope (SEM) results indicate the formation of a protective film on the steel surface in the presence of the studied inhibitors. This combined experimental and computational approach not only enhances our comprehension of the corrosion inhibition mechanism but also emphasizes the practical viability of 2-acetylpyrazine as an effective and temperature-sensitive inhibitor in HCl environments. These findings contribute significantly to advancing corrosion mitigation strategies with potential implications for industrial applications. https://pccc.icrc.ac.ir/article_81984_46d3178a63aa513b233080e7c870b43c.pdf