Assessment of a New Epoxy Resin for Corrosion Prevention of Mild Steel in HCl Environment: Experimental and Theoretical Analyses

In this work, we investigate whether bisphenol S tetraglycidyl ether dianiline dipropoxy (TGEDADPDS) can mitigate mild steel (MS) corrosion. One material that is well-known for its exceptional mechanical qualities as well as its affordability is TGEDADPDS. However, because of its susceptibility to corrosion, particularly in environments containing hydrochloric acid (HCl), corrosion inhibitor research is necessary. Several investigation methods, including surface analysis along with electrochemical testing, were used to assess how well TGEDADPDS inhibited a particular process. The results indicate that, in a 1.0 M HCl medium at 298 K, the optimal concentration of TGEDADPDS is 10⁻³ M. As measured by electrochemical impedance spectroscopy (EIS) and potentiodynamic plot (PDP), this concentration has an inhibitory efficiency of 97% and 96%, respectively. Following the Langmuir isotherm, the TGEDADPDS molecule demonstrated exothermic adsorption on MS. By preventing anodic and cathodic reactions, the adsorption technique known as chemisorption dramatically lowers mild steel corrosion. The adsorption process is defined by a ΔG_ads value of − 48.43 kJ/mol. Furthermore, scanning electron microscopy–energy-dispersive spectroscopy surface examination verified that a protective TGEDADPDS coating had formed on the electrode surface, which significantly decreased metal dissolution in the presence of hostile ions. Density-functional theory and Monte Carlo, along with molecular dynamics simulations, are used in the study’s theoretical calculations.

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