Electrodeposited Hydroxyapatite/Graphene Oxide/Zirconia Oxide Composite Coatings: Characterization and Antibacterial Activity

The current study aimed to characterize the hydroxyapatite, zirconia, and graphene oxide nanocomposite coatings on titanium substrate by the use of electrophoretic deposition. In the first stage, besides the characterization of the created composite coating, the thickness and uniformity of the created coating were evaluated by the use of Scanning Electron Microscope (SEM). Also, the distribution of the Nano-powder particles was investigated by the elemental analysis. In the second stage, by the use of X-ray diffraction analysis, the position of the materials used in the coating was drawn and investigated. In the third stage, in order to evaluate the coating’s corrosion behavior due to the addition of nanoparticles to the hydroxyapatite and compare it with the non-coated sample, the electrochemical analyses in the form of chemical polarization were investigated and analyzed with drawing the related charts. Finally, in the fourth stage, the antibacterial tests on the Escherichia coli and Staphylococcus bacteria on the coating were conducted and compared to the uncoated alloy samples. The corrosion test results indicated that the use of nano-composite coating leads to the increase in corrosion resistance of the surface. The antibacterial tests results demonstareted that the use of nano-composite coating effectively decreases the bacteria growth on the surface.

Keywords:

composite coating , Hydroxyapatite , Zirconium Oxide , graphene oxide , Electrophoretic deposition , Antimicrobial coatings