Cyclic Aging Study of Several Typical Heavy-Duty Coating Systems

According to the requirements of relevant corrosion protection standards, cyclic aging tests are carried out on three typical anti-corrosion coating systems including hot-sprayed galvanized composite coating, zinc-rich primer coating and non-zinc-rich primer coating, which are applied into the marine atmospheric environment. The causes for the failures are analyzed, and the anti-corrosion performances, construction costs, maintenance and environmental protection of the coatings are compared. In the cyclic aging test of the extreme corrosive environment, the main failure modes of the coatings are the crevice corrosion and physical effects caused by temperature change. The hot-sprayed galvanized composite coating and zinc-rich primer coating are recommended for the extreme corrosive environment. The development direction of the marine heavy-duty anticorrosion coating has environmental protection, low VOC and long lasting effect.