With respect to the corrosion resistance in1.0 M sulfuric acid, steel coated with the (PAn/P-PVA)0.7/PAc8 nanocomposite showed the best corrosion resistance (11.4%), but for the nanocomposites at each PAn/P-PVA loading level, the anti corrosive prop-erties increased with increasing PAc levels, presumably due to the increasing tortuosity of the diffusionpathway through the coating for any corrosion agents.