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Hydroxyapatite based and anodic titania nanotube biocomposite coatings: fabrication, characterization and electrochemical behavior

Ahmadi, S ; Sharif University of Technology | 2016

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  1. Type of Document: Article
  2. DOI: 10.1016/j.surfcoat.2015.12.062
  3. Publisher: Elsevier , 2016
  4. Abstract:
  5. The main challenges of biological implants are suitable strength, adhesion, biocompatibility and corrosion resistance. This paper discusses fabrication, characterization and electrochemical investigation of anodized Ti6Al4V without and with a hydroxyapatite (HA) layer, HA/TiO2 nanoparticles (NPs) and HA/TiO2 nanotubes (HA/anodized). X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and energy dispersive spectroscopy (EDS) were used to characterize and compare properties of different samples. Dense HA with uniform distribution and 12.8 ± 2 MPa adhesive strength enhanced to 19.2 ± 4 MPa by the addition of TiO2 nanoparticles and enhanced to 23.1 ± 4 MPa by the deposition of a TNT interlayer was fabricated by an anodic oxidation process. EIS analysis divulged the polarization behavior of various layers formed on a Ti6Al4V substrate. Electrochemical measurements indicated polarization passivation due to incorporation of TiO2 nanoparticles to HA. Hydroxyapatite on a TNT layer revealed lower corrosion resistance than a HA/TiO2 nanoparticle sample due to the vacuolar nature of TNT conformation. The passivation current density of the Ti6Al4V alloy coated with a HA/TiO2 nanocomposite (0.125 μA/cm2) was less than 1% of the bare substrate
  6. Keywords:
  7. Anodizing ; Nano-biocomposite ; TiO2 nanotubes ; Titanium alloy ; Biocompatibility ; Composite materials ; Corrosion ; Corrosion resistance ; Deposition ; Enamels ; Energy dispersive spectroscopy ; Fabrication ; Field emission microscopes ; Hydroxyapatite ; Nanoparticles ; Nanotubes ; Passivation ; Polarization ; Reduction ; Scanning electron microscopy ; Titanium alloys ; Titanium dioxide ; X ray diffraction ; Yarn ; Biocomposite coatings ; Electrochemical behaviors ; Electrochemical deposition ; Electrochemical investigations ; Electrochemical measurements ; Energy dispersive spectroscopies (EDS) ; Field emission scanning electron microscopy ; Nano bio composites ; Anodic oxidation
  8. Source: Surface and Coatings Technology ; Volume 287 , 2016 , Pages 67-75 ; 02578972 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0257897215304916?via%3Dihub