Nanoparticles Co3O4 with peroxidase catalytic activity were co-deposited with Zn by elec-trodeposition to obtain a novel Co3O4-Zn composite coating on Q235 carbon steel.Ultrasound and sodi-um oleate(Naol)were introduced during the co-deposition of Co3O4 and Zn,which strongly promoted dis-persion and adsorption of Co3O4 on the co-deposited surface coating.The characterization by SEM and XRD revealed that Co3O4 was obviously dispersed into the Zn matrix.The addition of Naol effectively in-creased the deposited amount of Co3O4 in the Co3O4-Zn coatings.Besides,the antimicrobial performance of the Co3O4-Zn coatings was evaluated with three typical fouling bacteria,namely,Escherichia coli(E.co-li),Staphylococcus aureus(S.aureus),and Pseudomonas aeruginosa(P.aeruginosa).Results showed that the coverage of these three bacteria on Co3O4-Zn coatings decreased over 98％,illustrating that the Co3O4-Zn coatings showed high and broad-spectrum antimicrobial performance.It was also found that the Co3O4-Zn coating in the presence of hydrogen peroxide(H2O2)produced superoxide radicals(·O2)and hydroxyl radicals(·OH),which played dominant roles in the antimicrobial process.Finally,the antimi-crobial stability and corrosion resistance of the composite coatings were also verified,and it was found that the composite coatings exhibited good antimicrobial stability and corrosion resistance characteristics.The results of this study provide a new possibility for the development of bactericidal coatings of simulat-ed enzyme catalyst and a new solution for green antifouling.
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