Fractal characteristic analysis of electrochemical noise with wavelet transform

摘要: In the study, fractal parameters were introduced to describe irregular characteristic of electrochemical noise, which calculated with wavelet transform overcome some defects other methods. Compared parameters, standard deviation (STD) exponent (Hws) had smaller and could characteristics noises in a wide range, therefore Hws was chosen evaluate general local irregularity potential signals generated from 7075-T76 aluminum alloy 3.5% NaCl solution without different inhibitors respectively. The results showed that value, more frequently fluctuated on electrode surface, less effect inhibitor solution. difference between 1 reflected condition surface passivity. Local effectively extract feature noise quantitatively change its time, promising index analyze practice.