Enhanced Corrosion Resistance of Ti6Al4V-Eli Via TiO2 and TiO2/Hydroxyapatite Nanocomposite Coatings

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Researchers from Istanbul Aydin University have developed a new method for enhancing the corrosion resistance of Ti6Al4V-ELI (Extra Low Interstitial) alloys using plasma electrolytic oxidation (PEO). The team successfully grew TiO2 and TiO2/HA composite coatings on the alloys, resulting in significant improvements to the corrosion performance. The study demonstrates the potential of nano-hydroxyapatite (HA) particles in synthesizing TiO2/HA nanocomposite coatings with enhanced corrosion resistance.

Key Takeaways:

  • The researchers used the plasma electrolytic oxidation (PEO) method to grow TiO2 and TiO2/HA composite coatings on Ti6Al4V-ELI alloys, improving the corrosion performance of the alloys.
  • Three different high frequencies (1250, 1500, and 1750 Hz) were applied during the PEO process to synthesize TiO2/HA nanocomposite coatings.
  • The corrosion characteristics of the coatings were evaluated using the potentiodynamic polarization scanning (PDS) technique at 37 degrees C, showing a 2-5 times higher polarization resistance than the Ti6Al4V-ELI alloy.
  • The highest corrosion-resistant coating was obtained in the nano-sized HA-containing coating grown at 1750 Hz.
  • The research found that the conventional TiO2-PEO coatings produced at the same frequencies had lower corrosion performance compared to the TiO2/HA coatings.
  • The study demonstrated the potential of HA particles in synthesizing nanocomposite coatings with enhanced corrosion resistance.

Statistics:

  • 2-5 times higher polarization resistance of the coated samples compared to the Ti6Al4V-ELI alloy.
  • 3 different high frequencies (1250, 1500, and 1750 Hz) applied during the PEO process.
  • 1750 Hz resulted in the highest corrosion-resistant coating.
  • 2-5 times higher corrosion resistance of the nano-sized HA-containing coating compared to the conventional TiO2-PEO coating.

Sources:

  • Arslan, E., et al. "Enhanced Corrosion Resistance of Ti6al4v-eli Via Tio 2 and Tio 2 /hydroxyapatite Nanocomposite Coatings Grown By High Frequency Plasma Electrolytic Oxidation." Journal of Materials Engineering and Performance, 2025.
  • NewsRx. New Findings from Istanbul Aydin University in the Area of Nanocomposites Reported (Enhanced Corrosion Resistance of Ti6al4v-eli Via Tio 2 and Tio 2 /hydroxyapatite Nanocomposite Coatings Grown By High Frequency Plasma ...). Nanotechnology Weekly. November 3, 2025; p 1942.