Abstract
Corrosion occurs in any environment where a metallic structure interacts with the surrounding environment, being the marine environment one of the most corrosive environments and therefore the one that deteriorates metals the most. The cathodic protection systems are the fundamental way to protect metallic structures in marine environments being a highly effective method, besides, as a reaction product of the cathodic protection system, calcareous deposits (CaCO3 and Mg (OH)2) are formed on the structures. One type of cathodic protection system is sacrificial anodes, among which Al-based anodes have been widely used. Al-Zn-X (In-Hg-Sn) alloys have shown an optimum performance as sacrificial anodes in seawater, but with a limitation which is the environmental contamination that some of its components can generate. The purpose of the present work of investigation was the variation of the electrochemical behavior of an Al-Zn-Mg alloy with a calcareous deposit. Evaluating this variation by Rp and EIS techniques, getting preliminarily that the formation of calcareous deposits generates a natural protective barrier on the structure of the alloy.
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