Corrosion protection strategies have always played a vital role in industrial and economic development.The corrosion protection in conventional coatings was generally achieved with the use of inhibitors like metallic pigments,metal oxides and salts at relatively high volume concentrations.Due to the restrict environmental regulations on the use of heavy metal containing primers,the new class of primers based on polyaniline pigments have received much attraction.Nevertheless,polyaniline exhibits poor physical and mechanical properties and is not soluble in common polar solvents.One of the methods to overcome these short-comings is emulsion polymerization of aniline.The Nano-particulate dispersions of the organic metal polyaniline in paint systems at low volume concentrations cause tremendous effects in corrosion protection.A soluble polyaniline nano-pigment was synthesized directly via emulsion polymerization method using benzoyl peroxide oxidant,sodium dodecyl sulfate surfactant and tartaric acid as effective dopant.The corrosion performance of polyaniline nano-pigments was investigated by electrochemical techniques performed with carbon steel electrodes in pigment suspensions in 3.5% NaCl solution.The studies have shown that the polyaniline nano-pigments are able to improve corrosion protection of carbon steel,as is evidenced by the shift in the corrosion potential,the lower corrosion rates and the higher resistance against corrosion obtained for carbon steel in contact with the pigment suspensions.The morphology and the nature of the protective pigments were assessed by scanning electron microscopy.