Effects of phthalic and salicylic acids on the kinetics of the synthesis of polyaniline (PAN) at platinum and on the PAN doping and degradation are studied, along with the adsorption behavior of these acids during the synthesis and degradation of PAN. Effect of additives on the PAN properties is determined by the interaction between additives and PAN. The acids make no impact on the PAN synthesis kinetics and affect only the PAN doping and degradation.