Portugaliae Electrochimica Acta 2020, 38(2), 107-123 DOI: 10.4152/pea.202002107 PORTUGALIAE ELECTROCHIMICA ACTA ISSN 1647-1571 Inhibition Performances of Nicotinamide Against Aluminum Corrosion in an Acidic Medium S. Bashir, a V. Sharma, a S. Kumar, a Z. Ghelichkhah, b,c Ime B. Obot d and A. Kumar a,* a Department of Chemistry, Faculty of Technology and Sciences, Lovely Professional University, Phagwara, Punjab, India b Department of Chemistry, Faculty of Science, Urmia University, Urmia, Iran c Department of Engineering Physics, University of Wisconsin Madison, USA d Center of Research Excellence in Corrosion, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia Received February 27, 2018; accepted June 10, 2018 Abstract The non-toxic anticorrosion properties of nicotinamide have been studied on aluminum in an acidic medium. The techniques included weight loss method, electrochemical measurements, quantum chemical calculations, Monte Carlo simulation, infra-red spectroscopy and scanning electron microscopy. This study gathers information about the inhibitor molecule adsorption onto the surface of metal specimens. Thermodynamic parameters were utilized to predict the adsorption mechanism. The dependence of corrosion inhibition efficiency on various parameters was examined, and it was seen that the increase in the inhibitor concentration and in temperature led to an increase in the inhibition efficiency. The dipole moment and EHOMO-ELUMO influenced the inhibition efficiency, which was observed by quantum chemical studies. Keywords: corrosion inhibition, electrochemical studies, molecular dynamic simulations, nicotinamide, quantum chemical parameters. Introduction Aluminum corrosion is the subject of critical technological importance, due to this metal’s increasing industrial applications [1-2]. Aluminum and its alloys represent an important category of materials, due to their wide applicability, especially in aerospace, household, industries, automotive, transportation and marine technology, mainly because of their good specific strength and excellent formability. Corrosion inhibitors are the chemical compounds which, when added in small concentrations to the environment, minimize or prevent corrosion [3]. * Corresponding author. E-mail address: drashishchemlpu@gmail.com