Study the effect of graphene on the hydroxyapatite coating of Ti-13Nb-13Zr alloy for biomedical application

Titanium-13Niobium-13Zirconium alloy has widespread potential in biomedical applications due to its high degree of biocompatibility, favorable mechanical properties, high corrosion resistance, and high possibility of osseointegration. The surface was improved by electrophoretic deposition method using hydroxyapatite and graphene (5g nanoHAp ) (5g nanoHAp+0.06 nanoGr ) and suspended in ethanol solution at different conditions of time and voltage (1,3,5 and 7 minutes) (50, 70, 90, and 100 volts). The effect of the two suspended materials on the surface of the Ti-13Nb-13Zr alloy was studied by using the tests of (visual observation, the weight, and thickness of the coating layer) to know the homogeneity of the coating layer, adhesion testing, contact angle, and electrochemical tests in addition to XRD. The results showed that the addition of graphene led to the stability of the thickness of the coating layer with deposition time in contrast to the voltage and an improvement in the adhesion, which increased from (0.91) to (3.03) compared to adding hydroxyapatite only. the Corrosion rate where improve by adding graphene from (57.4%) to (74%) compared to adding hydroxyapatite only from (50.8%) to (60%).