Abstaract In the present study, the surface of titanium dioxide (TiO 2 ) nanoparticles was modified with an absorbent gel based on acrylic acid (AA) and 2-acrylamido-2-methyl propane sulfonic acid (AMPS) as well as Acryl Amide (AAm) and AMPS via in-situ polymerization using 3-(triethoxysilyl) propyl methacrylate (MPS) as a coupling agent. The synthesized TiO 2 nanogel composites were then incorporated into a commercial epoxy resin in different weight percent (1, 2, and 4) 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), X-ray diffraction (XRD), and Field Emission Scanning Electron Microscopy (FESEM). Furthermore, to calculate the weight ratio of the inorganic to organic materials, the furnace was employed. Then the prepared nanogel composites incorporated into epoxy resin with different weight ratios. Subsequently, the pull-off adhesion test was conducted to evaluate the effect of incorporation of nanogel composites on the adhesion of coatings. The effectiveness of the TiO 2 nanogel composites as the self-healing material in the epoxy resin were assessed in 3.5 wt.% NaCl solution by potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS). The results confirmed the epoxy coating containing 2 wt.% of TiO 2 -AA/AMPS nanogel composite as well as the epoxy coating containing 1 wt.% of TiO 2 -AAm/AMPS nanogel composite as the most corrosion resistant samples with the self-healing efficiency of 92% and 98% respectively. Keywords: Self-healing, Coating, Titanium dioxide, Surface modification, Acrylic acid-co-2-acrylamido-2-methyl propane sulfonic acid, Acryl amide-co-2-acrylamido-2-methyl propane sulfonic acid