Deposition of HAp-Ta2O5 composite coatings by PEO technique forclinical applications

This research focused on enhancing the properties of hydroxyapatite (HAp) coatings by incorporatingvarious concentrations of tantalum pentoxide (Ta2O5) nanoparticles, ranging from 0 to 1.5 g/L, into theelectrolyte solution. The HAp-Ta2O5 composite coatings were applied to Ti6Al4V metallic implantsusing the plasma electrolytic oxidation technique. X-ray diffraction tests indicated that increasing theconcentration of Ta2O5 nanoparticles did not significantly affect the phase composition of the coatings.However, the coatings became denser and rougher when 1.5 g/L of Ta2O5 nanoparticles were added to thesolution. The improved microstructural properties of the HAp-1.5 g/L Ta2O5 composite coating resultedin a notable increase in mechanical properties, with more than a 40% improvement in both microhardnessand bonding strength compared to HAp alone. The corrosion resistance of the coated implants wasevaluated using potentiodynamic polarization tests. The introduction of Ta2O5 nanoparticles into the HApcoating led to a 72% reduction in corrosion current density, demonstrating their significant contribution toenhanced corrosion protection.

Deposition of HAp-Ta2O5 composite coatings by PEO technique forclinical applications Keywords:

Ti6Al4V implant , Plasma Electrolytic Oxidation , HAp-Ta2O5 coating , Corrosion