LAUSR

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 Rp and charge transfer resistance Rct were derived from linear polarization and electrochemical impedance spectroscopy, respectively. The results indicated that the calculated noise resistance Rn, which was obtained from moving average removal (MAR) or polynomial trend removal (PTR) trend removal method, could not equate with Rp or Rct in the present study. However, the active pitting energy Ec, deduced from FWT method without trend removal technique, shows the similar variation trend with Rp or Rct. 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 Ec presents closer relation to the metal surface structure and shows the same variation trend with the corrosion rate and severity.