The effect of nano biphasic bioceramic (NBPC) coating on 316L stainless steel (316L SS) was investigated. NBPC coatings were developed on 316L SS by electrophoretic deposition process followed by vacuum sintering. The NBPC coatings were characterised by XRD, FTIR, FESEM with EDAX and AFM studies. The electrochemical performances of the coated samples were carried out by open circuit potential-time measurements, potentiodynamic polarisation and electrochemical impedance studies in Hank's solution. The electrochemical studies indicate that NBPC-coated samples have improved corrosion resistance and Vickers microhardness test showed enhancement in mechanical strength. Invitro studies with MC3T3-E1 osteoblast cell shows non-toxicity and high proliferation of NBPC-coated samples. These studies confirm the enhanced corrosion resistance, good mechanical strength with enhanced cell attachment and proliferation on the coated samples thus making it an ideal candidate for orthopaedic implants.

Abstract

In this paper we discuss about the evaluation of Hydroxyapatite [Ca 10 (PO 4 ) 6 (OH) 2 , HAP] layer developed on titanium by Electrophoretic deposition (EPD) and interlayer TiO 2 formation on titanium by sintering in air at 800˚C for 1h using Electrochemical Impedance (EIS) and Anodic polarisation studies. The composite layer (HAP-TiO 2 -Ti) so formed improved the corrosion resistance and the stability of the coatings. The crystallinity and phase composition of the metal surface, HAP coatings, surface morphology and surface topography were characterized by XRD, Raman, FESEM with EDAX and AFM studies respectively. EIS investigations of the composite layer have shown high polarization resistance with low capacitance values over the uncoated sample. Similarly, during anodic polarization high corrosion potential (E corr ) and low corrosion current density (I corr ) values were obtained for composite layers in comparison with uncoated metal. The in vitro cytotoxicity studies of the coated material were carried out by MTT assay and cell attachment with osteoblast cells. This study revealed an enhanced cell attachment and proliferation on composite layer when compared to uncoated metal, which control the release of metal ions in to the biological system.

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