Corrosion and antimicrobial property of TiO₂/Cu₂O and TiO₂/Cu₂O@CeO₂ micro-arc oxidation coatings on Ti-6Al-4V alloys in natural seawater

Abstract

Microarc oxidation is an effective surface treatment for improving certain properties of metals and their alloys. In this paper, TiO₂/Cu₂O and TiO₂/Cu₂O@CeO₂ coatings were prepared on Ti-6Al-4V by microarc oxidation. The coatings exhibited good corrosion resistance and antimicrobial properties. X-ray diffraction (XRD), scanning electron microscopy (SEM), and 3D laser confocal were used to characterize the coatings. The properties of TiO₂/Cu₂O and TiO₂/Cu₂O@CeO₂ coatings were analyzed, including microstructure, surface roughness, corrosion resistance, and antimicrobial properties. The electrochemical results showed that the coatings prepared by microarc oxidation had enhanced corrosion resistance compared to the substrate. The antibacterial properties of TiO₂/Cu₂O and TiO₂/Cu₂O@CeO₂ coating against Pseudomonas aeruginosa were evaluated by fluorescence microscopy and plate counting. The antibacterial rate of TiO₂/Cu₂O@CeO₂ coating was up to 99.70%. In summary, the TiO₂/Cu₂O and TiO₂/Cu₂O@CeO₂ coatings prepared by microarc oxidation have a potential application background in the field of marine corrosion protection and biofouling.

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