Electropolymerized polyaniline (PAn) films in the presence of an anionic surfactant agent, sodium dodecyl sulfate (SDS), are studied by a combination of quartz crystal microbalance and cyclic voltammetry experiments. The influence of SDS in the kinetics of film grown taking into account the critical micelle concentration (cmc), determined by fluorescence method, is observed. The polymerization reaction time constant increases for SDS concentration lower than cmc. Quantitative analysis of the results obtained during the redox process is made in order to elucidate the SPS-PAn interaction and its influence in the charge compensation process occurring in the polymer film. SDS content in the PAn film increases the participation of solvent molecules during the redox process.