Abstaract In the present study, surface of momtmorillunit cloisite 30b nanoparticles was modified with an absorbent gel based on acrylic acid (AA) and Acryl Amide (AAm) via in-situ polymerization using 3-(triethoxysilyl) propyl methacrylate (MPS) as a coupling agent and N,N-Methylenebisacrylamid (MBA) as a crosslinking agent. The modified cloisite 30b nanogel composite was then incorporated into a commercial epoxy resin in different weight percent (0.5, 1, and 2) to prepare an effective self-healing epoxy coating. The chemical structure and surface morphology of the prepared nanogel composites were evaluated by Fourier transform infrared (FTIR), Thermal gravimetric analysis (TGA), X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM) and Tarasmission Electron Microscopy (TEM). The nanogel swelling method obtained the appropriate percentage MBA by 0.1329 wt.% which is swelled for 132/24 s w % and the XRD obtained the best percentage of using modified nanoparticles by 1 wt.% in syntesied copolymer. Furthermore, the dispersion and characterization of nano particles in polymeric matrix were investigated by FESEM and TEM method which calculated the mean diameter of nanoparticles by 1750±329 nm. Subsequently, the pull-off adhesion and elongation at break test was conducted to evaluate the effect of incorporation of nanogel composites on the adhesion of coatings. The effectiveness of the cloisite 30b nanogel composites as the self-healing material in the epoxy resin were assessed in 3.5 wt.% NaCl solution by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests and the results confirmed the epoxy coating containing 0.5 wt.% of 30b-AAm/AA nanogel composite was most corrosion resistant samples with the self-healing efficiency of 99.89 % respectively. Keywords: Self-healing, Coating, Montmorillunit nanoparticles, cloisite 30b, Surface modification, Acrylic acid-co-Acryl amide, self-healing efficiency
