DETECTING PITTING CORROSION AND ITS SEVERITY USING WAVELET ENTROPY IN ELECTROCHEMICAL NOISE MEASUREMENT

摘要: Entropy as a measure of uncertainty was used to represent the results wavelet technique in electrochemical noise analysis. The experimental signals were obtained by recording potential and current 7075 aluminum alloy 3.5%wt NaCl solution. decomposed into 16 levels using Daubechies wavelets. Wavelet output entropy calculated kernel density estimator Shanon equation. contribution high frequency scales decreased with appearance pits increased enlarged on electrode surfaces (detected scanning electron microscopy). amount reduction magnitude attributed severity pitting corrosion. It appears that waveletentropy plot is promising method differentiate between different types