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Go to Editorial ManagerThe microstructural analysis and electrochemical measurements tests were used to investigate the behaviors of (TiO2) and (HAp)-coated Ti-6Al-7Nb alloy in the SBF solution .By using RF sputtering, a thin TiO2 layer coated the substrate, while a thick layer of HAp coated the outer side of surface. The generated middle layer consist of the composite of TiO2 and HAp which is by AFM characterized as uniformly distributed coating system with nano size. The images of the scan electron microscopy (SEM) shows that there is no any cracking observed in the outer layer of tested samples due to the use of thin film TiO2 as mid lead to reduce the difference in the thermal expansion between the HAp material and Ti-6Al-7Nb substrate .The HAp upper layer significantly improve the bioactivity of the Ti-6Al-7Nb alloy. In this study, the bonding strength and the corrosion resistance was improved by using thin layer of TiO2. From electrochemical impedance spectroscopy (EIS) study Bod plot, the composite layer of TiO2 and HAp was suggested by the capacitive act as barrier layer coated substrate and prevent the relays of the ion from metallic. The results shows the values of Rox (309.2 k? cm2)are greater than for Rct(19.2 k? cm2), by assumes the presence oxide film increases for coated substrate are greater than that of uncoated, which is a result of the presence of coated film that improve the corrosion resistance of the sample.
In this study, an experimental and numerical approach is used to evaluate a transtibial bone-anchored prosthesis system that includes an osseointegration implant composed of Ti-6Al-7Nb. The work addresses three factors that are critical to clinical and biomechanical performance: (1) the mechanical properties and corrosion behavior of the implant materials, (2) enhancement of bioactivity via hydroxylapatite (HAp) surface coatings, and (3) structural response of the tibia-implant construct under physiologically representative gait loads. A compressive test was also realized, and the good mechanical behavior of Ti-6Al-7Nb (σu =1271 MPa; σy = 755 MPa) revealed its ability to be used for load-bearing applications. The HAp coatings had a homogeneous nanostructure, greatly enhanced corrosion resistance (89% protection efficiency), and induced apatite-like formation in simulated body fluid. Peak ground reaction force was 1060 N, recorded using gait analysis, and used for implant biomechanics analysis in FE modelling. The equivalent stress of the model was low (11.95 MPa), its deformation small (0.114 mm), and the safety factor high (11.7), indicating that the implant‐bone interface had good structural stability. Taken together, these data demonstrate that Ti-6Al-7Nb osseointegrated prostheses for transtibial amputees exhibit good mechanical reliability and bioactivity, offering a stable load-transfer profile suitable for long-term clinical application.