Abstract

In this study, corrosion behavior of Pb-MnO₂ composite coatings were developed on the pure lead anodes with 5, 10, 15 and 20 MnO₂ (wt-%) in acidic zinc sulphate electrolyte were investigated. The method of coating was cold spraying technology. The electro catalytic activity towards oxygen evolution reaction (OER) and corrosion resistance of samples were evaluated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods. The results point to that Pb-15MnO₂ (wt-%) composite coating anode had the lowest corrosion activity among the other examined anodes. Also, for investigating the mechanism of corrosion electrochemical noise techniques method (ZRA) were done. The results indicated that the Pb-15MnO₂ (wt-%) has uniform corrosion approximately but the other coatings showed the pitting corrosion.

Keywords: Pb-MnO₂ Composite coating; EIS; OER; Electrochemical noise techniques method (ZRA); Pitting corrosion