Correlation between the corrosion rate and electrochemical noise energy of copper in chloride electrolyte

An electrochemical noise technique has been applied to describe the corrosion process of copper. The results show that the sampling frequency clearly changes both the energy distribution plot and the power spectral density spectra, which should be taken into consideration strictly and logically before an electrochemical noise test. The corrosion energy, (E(c)), deduced using the fast wavelet transform method showed a similar variation trend with corrosion rate. Hence, the proposed parameter E(c) represents the corrosion rate or severity.