Fabrication of biopolymers reinforced TNT/HA coatings on Ti: Evaluation of its Corrosion resistance and Biocompatibility

Titania nanotube (TNT) arrays were fabricated on Ti alloy by rapid breakdown anodization (RBA) method and chitosan (CS) - polyvinylpyrrolidone (PVP) biopolymers were codeposited on TNT followed by subsequent electrodeposition of hydroxyapatite (HA, Ca10(PO4)6(OH)2,). The coatings were characterized by FE-SEM, EDX, XRD and AT-FTIR techniques. The mechanical, anticorrosion properties and biocompatibility of the coatings were evaluated. SEM analysis shows that among all coatings, the TNT/CS-PVP/HA coating possesses homogeneous surface and the incorporation of PVP into CS resulted in better morphology. The tentative mechanism for the deposition of CS-PVP biopolymers on TNT was proposed. Studies on the mechanical properties indicate that the addition of PVP into CS increase the hardness and adhesion strength of the coatings and the deposition of HA on TNT/CS-PVP coating further increase the mechanical strength. Similarly TNT/CS-PVP/HA coating shows good corrosion resistance, better fibroblast cell adhesion and low cytotoxicity behaviour than TNT and TNT/CS-PVP coatings.

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