Evaluating (p-Semidine-Guanidine-Formaldehyde) terpolymer resin efficiency as anti-corrosive agent for mild steel in 1 M H2SO4: An experimental and computational approach

Abstract

Corrosion is a critical concern in various industrial applications, especially in acidic environments. In this study, for the first time, we investigate the efficient anti-corrosive effect of (p-Semidine-Guanidine-Formaldehyde) terpolymer resin on mild steel in a corrosive sulfuric acid (H2SO4) medium. The research employs a comprehensive approach, combining experimental and computational methods to gain deeper insights into the corrosion inhibition mechanism. Electrochemical and gravimetric measurements are performed to determine when the inhibitor is incorporated andor not, mild steel corrodes at similar rates. The inhibition efficiency (%) is calculated based on the obtained data, revealing the effectiveness of the terpolymer resin showing an inhibitory efficacy of 93.70 % at an ideal concentration of 1 × 10−3 M as a corrosion inhibitor. Moreover, the adsorption behavior of the inhibitor on the mild steel surface is examined, and a Langmuir adsorption isotherm model is applied to explain the adsorption process. The computational simulations including HOMO and LUMO analyses shed light on the electronic properties and chemical structure of the (p-Semidine-Guanidine-Formaldehyde) terpolymer resin, elucidating its anti-corrosive mechanism. These findings hold significant implications for designing effective and environmentally friendly corrosion inhibitors for various industrial applications, leading to improved material durability and safety.