engleski

Evaluation of corrosion protection of two underwater coating systems in simulated marine environment

Ship hull is typically coated with coating systems which have both anticorrosive and antifouling purposes and consist of a primer, a tie coat, and an antifouling coat. Within this study, the protective properties of two different anticorrosion-antifouling coating systems are evaluated in the humid and warm atmosphere, as well as in the simulated marine environment utilizing the salt spray chamber testing and immersion test with and without agitation. The tested coating systems differ in the type of antifouling coating, i.e. self- polishing antifouling based on copper and the new fouling release coating based on miscellaneous components. The corrosion performances of coatings in natural seawater are examined using open circuit potential measurement, electrochemical impedance spectroscopy, and pull-off test. Antifouling properties are reviewed by visual examination, measurement of coating roughness before and after the exposure to the testing solution, and after immersion in the solution containing Saccharomyces cerevisiae by measuring optical density. The obtained results show better corrosion and antifouling properties of the coating system with a self-polishing antifouling top coat compared to the coating system with foul-release top coat. A thicker biofilm was noticed on the plates immersed in seawater with agitation compared to stationary conditions, on both antifouling coatings.

anticorrosion-antifouling coating system ; corrosion performance ; biofilm ; EIS measurement ; immersion

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