Corrosion has been a perennial issue of concern for the steel industry. One of the wellknown pre-treatment coatings for steel is chromate conversion coatings but due to environmental concerns and legislations, their use has been restricted. The present study concerns an alternative eco-friendly pre-treatment coatings consisting of hybrid nanocomposite materials based on graphene embedded siloxane plasma polymers. The deposition of hybrid nanocomposites films were performed by using a low pressure (PECVD) reactor as well as a dielectric barrier discharge (DBD) at atmospheric pressure. Direct current polarization (DCP) and electrochemical impedance spectroscopic (EIS) techniques were used to measure the polarization and corrosion resistance of the coated steel substrates. The graphene used is produced by the chemical Hummers' method. The optimal weight percentage of the graphene in the plasma polymer, and particle size of graphene were optimized to ensure good protection against corrosion but also to avoid its aggregation which will cause delamination in the hybrid layers formed respectively. An approach using an aerosol-assisted process in which a dispersion containing preformed graphene nanoparticles and the liquid precursor of the polymeric component was atomized and injected in the form of an aerosol in the dielectric barrier discharge (DBD) at atmospheric pressure.