Formation of MoS2/HA ceramic film on plasma electrolytic oxidized Ti-6Al-4V using mechanically synthesized method: Enhancing surface characteristics and biocompatibility for bio-implant

This study inspected the impact of mechanically synthesized molybdenum disulfide (MoS2) and hydroxyapatite (HA) coatings on plasma electrolytic oxidation (PEO) treated Ti-6Al-4V alloy. For the formation of MoS2-HA ceramic, varying compositions of MoS2 and HA (0, 3, 5, and 7 g) were mechanically synthesized (MS) for 6 h in a mechanical mixer containing PEO-treated Ti-6Al-4V alloy. The research aimed to evaluate the influence of these coatings on surface properties and bioactivity. The combined use of MoS2 and HA leverages the unique properties of both materials: HA provides excellent biocompatibility and corrosion resistance, while MoS2 enhances mechanical properties and scratch resistance. Surface characterization techniques, FESEM, XRD, and FTIR were employed to analyze the MS film's morphology, composition, and surface properties. Mechanical properties of ceramic were assessed through nanoindentation and scratch tester. PDP and EIS tests were conducted to evaluate the corrosion resistance of the ceramic. Moreover, the bioactivity of the ceramic was assessed through immersion tests in SBF, examining the formation and growth of apatite layers on the surface. EIS was also performed after SBF immersion. Results indicated that the MoS2-HA coatings significantly enhance the surface properties, corrosion resistance, and bioactivity of the PEO-treated Ti-6Al-4V alloy, with the optimal composition determined to be the sample of 3g MoS2 and 7g HA.