A study of calcium carbonate/multiwalled-carbon nanotubesichitosan composite coatings on Ti-6Al-4V alloy for orthopedic implants

In an attempt to increase the stability, bioactivity and corrosion resistance of Ti-6Al-4V alloy, chitosan (CS) biocomposite coatings reinforced with multiwalled-carbon nanotubes (MWCNTs), and calcium carbonate (CaCO3) for surface modification were utilized by electroless deposition. Scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR) reveals the formation of a compact and highly crosslinked coatings. Electrochemical techniques were used to investigate the coats stability and resistivity for orthopedic implants in simulated body fluid (SBF). The results show that E-st value is more positive in the following order: CaCO3/MWCNTs/CS > CS/MWCNTs > CS > MWCNTs. The calculated i(corr) was 0.02 nA cm(-2) for CaCO3/MWCNTs/CS which suggested a high corrosion resistance. (C) 2013 Elsevier B.V. All rights reserved.