sažetak izlaganja sa skupa
Classical electrochemical methods, such as electrochemical impedance spectroscopy (EIS) provide insight into the average behaviour of the entire tested surface. However, the results of these methods are sometimes difficult to interpret due to local phenomena of coating degradation, such as blistering. In addition, EIS does not provide information on the location of micropore or microcrack formation and is therefore not a suitable method for studying coating degradation mechanisms [1]. To overcome these obstacles, Scanning Electrochemical Microscopy (SECM) was developed, opening up the possibility investigating the initial stages of electrochemical corrosion. The primary goal of this research is to complement EIS measurements with SECM results on different samples of epoxy coating enriched with aluminum nanoparticles (Al NPs) and graphene oxide (GO). Macro and micro electrochemical measurements, including cyclic voltammetry (CV) and EIS, were carried out in a 3.5 wt.% NaCl solution. The test results showed that SECM measurements can identify active and passive areas, facilitating the study of local degradation of nanoparticles within the epoxy coating. Additionally, the addition of nanoparticles provides greater resistance, thereby improving anti-corrosion protection.
electrochemical impedance spectroscopy; Scanning Electrochemical Microscopy; aluminium nanoparticles, graphene oxide
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