Conductive polymers such as polypyrrole, PPy, are materials capable of conducting electrical current. In this paper two techniques for the electrodeposition of PPy on carbon steel were used: Cyclic Voltammetry (CV) and Chronoamperometry (CA). The characteristics of film electrosynthesized on the carbon-steel substrate (CS-1018) using KNO 3 as supporting electrolyte was studied. The results concluded that under experimental conditions used is possible make a PPy film with adequate characteristics. Important factors were the grip and electrochemical stab ility of the formed film on steel, which depends on the electrosynthesis technique and in some cases favored by a pretreatment with a 10% HNO 3 solution applied to the steel prior to electropolymerization. The results showed that the polypyrrole deposited with pretreatment completely covered the steel surface and showed better stability and grip.