Performance of a Zinc-Based Sacrificial Anode for Cathodic Steel Protection Against Corrosion in a Salty Medium
Abstract
The cathodic protection by means of sacrificial anodes is often used for the corrosion protection of immersed metallic components. The electrochemical behavior of Zinc sacrificial anodes was investigated in this study employing electrochemical impedance spectroscopy (EIS) and polarization curves, as well as Scanning electron microscopy (SEM). The impedance diagrams are generated by two capacitive loops at high and intermediate frequencies, with the first linked to the charge transfer resistance parallel to the double-layer capacity, and second to zinc ions concentration. At low frequencies, a broadcast line from Warburg is obtained, indicating that Zn corrosion is controlled by diffusion.
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