Effect of Marine-Industrial Microenvironments on the Corrosion Performance of Multilayer Coatings

Atmospheric contaminants from marine-industrial environments could cause corrosion damage on steel A36 usually used in equipment and machinery. Therefore, it is desirable to study the corrosion phenomena in different microenvironments and formulate adequate protection measures. In this study, three microenvironments were selected and categorized according to ISO-12944-2 standard as C5-I and C5-M. Four multilayer-coating schemes were used on each exposure site to evaluate their performance. Corrosion products were analyzed using x-ray diffraction, Raman, and ultraviolet-visible techniques. The results showed that the best system was composed of a flake-filled-epoxy/polyamides/epoxy-siloxane. The results confirmed the influence of atmospheric contaminants on overall behavior from different locations.