: Possibility of direct formation of polymer coating onto metal substrate stated as greatest advantage in electropolymerization process. Electropolymerization bath consisted of two main constituents: monomer and counter ion. . By adding saccharin as the third constituent, a new branch emerges in electropolymerization that will yield coatings with modified properties. In the present study, polypyrrole is galvanostatically deposited onto carbon steel in an aqueous solution containing 0.2 M pyrrole and 0.1 M oxalic acid as the supporting electrolyte with (0.25, 0.5, 2.5 g/l) and without saccharin addition. Presence of sulfur element was confirmed by Elemental analysis and EDAX spectroscopy. Determination of the corrosion resistance of coatings in 0.1 M NaCl solution shows that in the presence of 0.5 g/l saccharin, a more noble corrosion potential and a greater corrosion resistance will obtain. Electrochemical impedance spectroscopy (EIS) revealed that the corrosion process was under infinite diffusion control of ions during prolonged immersion. The results indicate that the lower diffusion rate of ions in the coating produced in the presence of 0.5 g/l saccharin is responsible for its better corrosion resistance. Atomic force microscopy (AFM) shows that greater compaction of the coating produced in the presence of 0.5 g/l saccharin could be the reason for its higher corrosion resistance. PPy coating was also produced by Pulsed method in the same electropolymerization bath. Electrochemical properties were studied by cyclic voltametery (CV). Magnetite nano powder was added into solution in due to produce of nano composite coating. EIS study appeared that Warburg diffusion was completely eliminated and corrosion process was controlled by increasing of charge transfer resistance in 0.1 M NaCl solution.