Electrochemical noise signals evaluation to classify the type of corrosion using Synchrosqueezing transform

In this research, the corrosion type evaluation on the 6061-T6 aluminum alloy exposed to three different solutions using the Electrochemical Noise (EN) technique evaluated by the Synchrosqueezing Transform (SST), and the Shannon energy (SSE) methods is presented. The solutions used for the tests were Sulfuric Acid (15% H2SO4), Sodium Chloride (3.5% NaCl), and demineralized Water (diH2O), these solutions were chosen to evaluate the type of corrosion because of each one of them produces a different corrosion type on the Aluminum alloy. To carry out the evaluation, firstly, the EN signals (Electrochemical Potential Noise (EPN) and Electrochemical Current Noise (ECN)) are obtained from probes. After, these signals are evaluated by the SST-SSE method without removing the DC drift. Finally, the EPN and ECN are evaluated using only the SST method. To show the effectiveness of the SST-SSE and SST methods, a comparison with the Wavelet Transform and the Localization Index is carried out. •Corrosion type identification using the Synchrosqueezing Trans-form•Corrosion type identification using the Synchrosqueezing and Shannon Energy•Comparison between the proposed methodology and the Wavelet Transform technique