Eco-Friendly Polysaccharide Inhibitors for Steel-Reinforced Concrete: Synergistic Corrosion Resistance and Structural Enhancement Using Welan and Neem Gums

This Research investigation explores the viability of Welan gum (WG) and Neem gum (NG) as sustainable corrosion inhibitors for steel-reinforced concrete subjected to chloride exposure. Electrochemical impedance spectroscopy (EIS), Tafel polarization, scanning electron microscopy (SEM), and density functional theory (DFT) were employed to elucidate inhibition mechanisms and material performance. Both biopolymers formed protective films on steel surfaces, acting as mixed-type inhibitors by suppressing anodic and cathodic reactions. DFT simulations revealed reactive molecular sites enhancing adsorption, while mechanical testing indicated notable compressive (42.7 MPa with WG) and tensile strength (3.35 MPa) improvements. The study positions these polysaccharides as eco-conscious alternatives to synthetic inhibitors, merging corrosion mitigation with enhanced structural durability for sustainable infrastructure.