By means of the technique of Electrochemical Impedance Spectroscopy, the protective effect of Paraloid as coating and with the addition of strictosamide as corrosion inhibitor was analyzed. At a concentration of 50 mg/m2, a 69% of efficiency was reached, being the best concentration to protect the metallic surface. However, when the strictosamide was applied in concentrations of 20 mg/m², it was observed that the corrosion was promoted, even more than when the Paraloid was not applied.