Study of nano material based corrosion inhibitor for metal surface

Abstract

The work focuses on synthesizing metal/metal oxide/other nanomaterials and evaluating their corrosion inhibition efficiency on mild steel using weight loss studies, EIS (LPR, PDP, AC impedance), and theoretical analyses. TiOand#8322; NPs, TiOand#8322;/PVP NC, CeOand#8322; NPs, CH-CeOand#8322; NC, PD/CeOand#8322; NC, ZnO NPs, ZnO/PAA NC, and MnO NPs were synthesized via chemical methods such as co-precipitation, sol-gel, and in-situ addition, and characterized using UV-Vis, FT-IR, XRD, SEM/EDAX. Their anti-corrosive performance was tested across 100 500 ppm concentrations and 308 338 K for 3 4 hours. Inhibition efficiency increased with concentration and decreased with temperature, while corrosion rate showed the opposite trend. Thermodynamic and kinetic parameters indicated an endothermic corrosion process (positive and#916;H) and positive and#916;Gads, implying instability of the activation complex. Adsorption followed the Langmuir isotherm, showing mainly chemisorption with some physisorption. EIS results showed increased Rct and decreased Cdl with higher inhibitor concentration, confirming reduced charge transfer and greater surface coverage. Potentiodynamic polarization revealed mixed-type inhibition. Surface analysis (AFM, optical microscopy) showed reduced steel degradation, especially with nanocomposites; doped MnO NPs further lowered surface roughness due to synergistic effects. Theoretical studies (EHOMO, ELUMO, and#956;, and#967;, I, A, and#948;N) supported strong chemical adsorption through electron donation from inhibitors to vacant d-orbitals of mild steel. newline