Improvement of corrosion resistance of Ti13Nb13Zr alloy using biomedical nanoceramic coatings

Abstract

Metals used for mending fractures or substituting implants due to osteoporosis or injuries need to possess strength, durability, and compatibility with living tissue. For instance, titanium metal exhibits exceptional antibacterial attributes and has brought about enhanced biocompatibility and osseointegration. Titanium-based biominerals may exhibit specific biological functions through their nanoscale coating. The coating process involved electrophoretic deposition and then sintering at 400 °C. The samples were analyzed using XRD, FE-SEM, OCP, and Tafel electrochemical corrosion cell. The treated samples exhibited significantly greater resistance to corrosion compared to their untreated counterparts. The corrosion rate went from 15.13 × 10-5 mmpy for the uncoated sample to 9.564 × 10-6 mmpy for the coated sample by HA70MgO15YSZ15 and then to 4.683 × 10-6 mmpy for the coated sample by HA70MgO15(Al2O3)15 and finally to 2.522 × 10-6 mmpy for the sample coated sample HA55MgO15YSZ15 Al2O315. The coated samples showed an increase in open circuit potential and a significant decrease in contact angle from 73.848° to 4.513°, indicating improved biocompatibility of medical titanium alloys.