High Antifouling Performance of Coatings Based on Cu2O and Flake ZnAl Composite for Steel Protection

Abstract

Recent research has explored integrated pigment coatings for anticorrosion and antifouling in marine environments, focusing on zinc (Zn) and cuprous oxide (Cu2O) for their notable properties. However, their combined effects in the same coating have not been explored. This study investigates how Cu2O content impacts Zn-containing ethyl silicate coatings. The anticorrosion efficiency of the coating was found to be reduced and the release of Zn was slowed down by Cu2O via electrochemical impedance spectroscopy and atomic absorption spectroscopy measurements. The Zn release rate insignificantly changed with increasing Cu2O content. Interestingly, bacterial tests revealed that a coating with 10 wt.% Cu2O showed the strongest antibacterial activity. After six months of field testing, this formulation retained its protective effects with minimal fouling. These findings highlight the interplay between Zn and Cu2O pigments and their potential to enhance coating performance.