Wavelet Analysis of Electrochemical Noise Measurements During Atmospheric Corrosion of Mild Steel in the Simulated Marine Environment

Lihua Dang, Tianjin Special Equipment Inspection Institute, Tianjin, 300192, China;
2020 International Journal of Electrochemical Science  
In this paper, the wavelet decomposition of the electrochemical noise was successfully applied to derive the wavelet noise resistance (Rcd), which was further used to assess the corrosion behavior of Q235 mild steel in the simulated corrosion atmosphere (the salt spray test with 0.01 and 0.1 mol/L NaCl). The noise signatures, noise resistance (Rn), SEM, and XRD techniques were used as complementary measurements. The electrochemical noise data were acquired from two identical working electrodes
more » ... y the zero resistance ammeter (ZRA) mode. The experimental results of the noise signatures and Rn indicated that the corrosion rate increased with the exposure time in the early stages of atmospheric corrosion. The analysis of the surface corrosion morphology and Rn showed a higher corrosion rate at a higher concentration of spraying solution. Also, the values of Rn and Rcd closing to the 2 Hz corroborate well in both simulated corrosion atmospheres. The wavelet noise resistance is an effective method for the analysis of the atmospheric corrosion damage of Q235 steel in the marine environment.
doi:10.20964/2020.05.06 fatcat:xt7mth4kvzdv5hvbax5hclexsi