Fabrication of TiO2–SiO2 bioceramic coatings on Ti alloy and its synergetic effect on biocompatibility and corrosion resistance

• Titania–silica bioceramic coatings were fabricated by anodization in a single step.
• Dense coatings were achieved using cheap sodium silico fluoride (SSF) electrolyte.
• The coatings show good biocompatibility as well as apatite forming ability.
• Anodized coatings show better corrosion resistance compared to bare titanium.

Most of the research work focussed on fabricating an implant material with an ideal combination of potential bioactivity on the surface and striking mechanical property of bulk in one elementary operation. Interwoven with above concept, SiO2 incorporated nanostructured titania coatings were fabricated on Ti alloy by anodization using sodium silico fluoride electrolyte (SSF). The coatings were characterized by SEM, EDS, AFM, XRD and AT-FTIR techniques. The bioactivity and biocompatibility of the anodic coatings were also investigated. The AT-FTIR, EDS and XRD studies confirm the incorporation of SiO2 into TiO2 coating was confirmed by EDS, XRD and AT-FTIR techniques. The coating formed at the optimum conditions displays a dome like structure with nano flake morphology with maximum mechanical and anticorrosion properties. AFM analysis inferred that the surface roughness of the ceramic coating is higher compared to the pure titania. The SBF test and cell adhesion results predicted that SiO2 incorporated TiO2 coating is superior in their bioactivity compared to TiO2 coating.

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