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In vitro bioactivity and corrosion resistance enhancement of Ti-6Al-4V by highly ordered TiO 2 nanotube arrays

Sarraf, M ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1007/s41779-018-0224-1
  3. Publisher: Springer International Publishing , 2019
  4. Abstract:
  5. In the present study, the structural features, corrosion behavior, and in vitro bioactivity of TiO 2 nanotubular arrays coated on Ti–6Al–4V (Ti64) alloy were investigated. For this reason, Ti64 plates were anodized in an ammonium fluoride electrolyte dissolved in a 90:10 ethylene glycol and water solvent mixture at room temperature under a constant potential of 60 V for 1 h. Subsequently, the anodized specimens were annealed in an argon gas furnace at 500 and 700 °C for 1.5 h with a heating and cooling rate of 5 °C min −1 . From XRD analysis and Raman spectroscopy, a highly crystalline anatase phase with tetragonal symmetry was formed from the thermally induced crystallization at 500 °C. Besides, the Ti 2p 3/2 and Ti 2p 1/2 binding energies showed the presence of the Ti 4+ oxidation state. According to the in vitro bioassay, the modified surface proved its outstanding capability in enhancing the bioactivity, where a thick layer of bone-like apatite was formed on the annealed TiO 2 nanotube surface. In addition, the corrosion measurements indicated that the corrosion protection efficiency increased remarkably and reached 87% after annealing at 500 °C. [Figure not available: see fulltext.]. © 2018, Australian Ceramic Society
  6. Keywords:
  7. Anodization ; Corrosion resistance ; In vitro bioactivity ; TiO 2 nanotubes ; Ti–6Al–4V ; Annealing ; Binding energy ; Bioactivity ; Corrosion protection ; Corrosive effects ; Electrolytes ; Ethylene ; Ethylene glycol ; Fluorine compounds ; Nanotubes ; Organic solvents ; Phosphate minerals ; Ternary alloys ; Titanium ; Titanium dioxide ; Yarn ; Anodizations ; Corrosion measurements ; Heating and cooling rates ; In-vitro bioactivity ; Protection efficiency ; Resistance enhancement ; TiO2 nanotubes ; Water solvent mixtures ; Aluminum corrosion
  8. Source: Journal of the Australian Ceramic Society ; Volume 55, Issue 1 , 2019 , Pages 187-200 ; 25101560 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s41779-018-0224-1