Synthesis characterisation and analysis of the corrosion resistance of a new epoxy resin onto mild steel in the presence of hydrochloric acid: practical and theoretical points of view
Abdeslam El Amri, Abdeslam El Amri, Mouna Azogagh, Rim Sayed, Abdelhay El Amri, Abdelhay El Amri, N. Errahmany, Fatima Hamouche, Rachid Hsissou, Nadia Dkhireche
Abstract
In this work, we synthetised the tetraglycidyl ether L-(+) ribose (TGER). TGER was identified through nuclear magnetic resonance spectroscopy (NMR). The effectiveness of a novel epoxy resin derived from TGER in protecting mild steel from corrosion in hydrochloric acid has been evaluated. After 30 minutes of immersion, electrochemical impedance spectroscopy revealed that TGER could reduce mild steel corrosion, achieving an inhibition rate of 93% at 10−3 M. According to the Langmuir isotherm model, chemical bonding allows the compound to adhere to the mild steel surface. Molecular structure analysis using density functional theory (DFT) supports the observed inhibition efficiency. Furthermore, molecular dynamics studies indicated that the interaction energy of the TGER inhibitor increased, while radial distribution function analysis confirmed the chemical adsorption of the inhibitors onto the metal surface. Additionally, thermodynamic activation parameters suggested that the adsorption process on the metal surface was spontaneous. The synthesised TGER epoxy resin provided maximal protection of 93% at 10−3 M, and the epoxy functional groups improved the anti-polarisation efficacy of the molecule.