The damage caused by atmospheric pollutants, chlorides, and sulfates, is evident in historical metallic monuments. Therefore, it is vitally important to analyze these interactions to ensure adequate conservation. The electrochemical behavior was studied using Linear Polarization Resistance (LPR) and Electrochemical Impedance Spectroscopy (EIS) of quaternary bronze with an artificially formed patina with CuSO4 representing a historical metal exposed in the atmosphere and thus obtaining information about its degradation process during a determined time. The results show that charge and mass transfer processes were carried out by varying the resistances of the patinas during the weeks that they were exposed, reaching to observe a diffusive and metastable process due to the formation of corrosion products that lead to an increase in the resistance of charge transfer.