Use of EIS, Polarization and Electrochemical Noise Measurements to Monitor the Copper Corrosion in chloride media at different temperatures

Different electrochemical methods were applied to monitor the copper corrosion behavior in 0.06 mol/L NaCl solution. Some important electrochemical parameters, including the polarization resistance R-p and charge transfer resistance R-ct were derived from linear polarization and electrochemical impedance spectroscopy, respectively. The results indicated that the calculated noise resistance R-n, which was obtained from moving average removal (MAR) or polynomial trend removal (PTR) trend removal method, could not equate with R-p or R-ct in the present study. However, the active pitting energy E-c, deduced from FWT method without trend removal technique, shows the similar variation trend with R-p or R-ct. Hence, electrochemical noise can be utilized as a nondestructive technique to on-line monitor the corrosion progress which can be performed with simple equipment. Furthermore, the deduced parameter E-c presents closer relation to the metal surface structure and shows the same variation trend with the corrosion rate and severity.