In this study, polyethylene superhydrophobic coatings containing chemical modified nanosilica on carbon steel were prepared. Silica nanoparticles were modified with vinyl tri methoxy silane (VTMS( by 1-18 mole ratios of VTMS to surface hydroxyl of nanosilica. In the mole ratio of 18, the maximum increase in diameter, weight, and chemical porosity was occurred in silica nanoparticls. The minimum amount of the particles moisture content was also observed in this mole ratio. Nanocomposite mixtures consisting of maleic anhydride grafted polyethylene and different amount of modified nanoparticles in ethanol were casted on steel surfaces and then coated by evaporation of ethanol. Wetting measurement showed that by increasing the amount of modified naoparticles, contact angle increased and sliding angle decreased. So that the maximum contact angle (149.5 degree) and the minimum sliding angle (6 degree) were achieved at 215 part per hundred gram polymer (phr) of modified nanoparticles. Also, a high density polyethylene film was produced on steel surface by electrostatic powder coating technique followed by an oven heating. Then, this coating was dip coated in modified nanoparticle slurry to form the desired microstructure and roughness. Heat treatment was applied for stabilizing these nanoparticles on the surface of polyethylene coating. In this process, the mole ratio of [VTMS]:[OH] was varied from 1 to 18. In the mole ratio upper than 6, a superhydrophobic polymeric coating with very low sliding angle (almost 1 degree) was obtained on the steel surface. Finally, by performing tafel test, it was found that a considerable increase in corrosion resistence of the samples was obtained. Keyword: silica, nanoparticle, steel, polyethylene, coating, superhydrophobic, self cleaning, sliding angle, corrosion resistence
