Expired Glucored Forte Drug: An Eco-friendly Corrosion Inhibitor for Mild Steel

Abstract

Expensive casualties can occur if the basic corrosion control technology does not properly check. Repurposing expired Glucored Forte drugs as corrosion inhibitor reduces waste and promotes environmental sustainability. The present work investigated the corrosion inhibition of mild steel using an expired Glucored Forte drug in 2 M HCl solution. The inhibitive properties of mild steel in 2 M HCl solution were evaluated at various temperature range of 30oC – 50oC using weight loss measurements. The expired Glucored Forte drug showed efficiency of 85.7% at concentration of 300ppm. The spontaneous adsorption of the Glucored Forte drug on a mild steel surface is indicated by the negative values of Gibb’s free energy (∆Goads) which ranged from -14.52 kJ/mol to -22.57 kJ/mol, and the mechanism of adsorption is physisorption. The endothermic process of the adsorption of the Glucored Forte drugs on the mild steel surface is shown by the positive values of ΔH°. The negative values for entropy entail that the adsorption behaviour is accompanied by a decrease in entropy. The results showed that inhibition efficiency increased with increase in concentration of inhibitors and decreased with increase in temperature. The presence of heteroatoms such as Nitrogen and Oxygen, as well as the presence of π-bonds in the aromatic rings strengthened the observable effect of Glibenclamide molecule and facilitated surface interaction.