Enhanced corrosion resistance and biocompatibility of β-type Ti-25Nb-25Zr alloy by electrochemical anodization

Her Hsiung Huang, Chia Ping Wu, Ying Sui Sun, Hsun Miao Huang, Tzu Hsin Lee

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17 Citations (Scopus)

Abstract

The biocompatibility of implants is largely determined by their surface characteristics. This study presents a novel method for performing electrochemical anodization on β-type Ti-25Nb-25Zr alloy with a low elastic modulus (approximately 70 GPa). This method results in a thin hybrid layer capable of enhancing the surface characteristics of the implants. We investigated the surface topography and microstructure of the resulting Ti-25Nb-25Zr alloy. The corrosion resistance was evaluated using potentiodynamic polarization curve measurements in simulated body fluid. The cytotoxicity was evaluated according to International Organization for Standardization 10993-5 specification. Cell adhesion of human bone marrow mesenchymal stem cells on the test specimens was observed using scanning electron microscopy and fluorescence microscopy. The anodization produced a thin (approximately 40 nm-thick) hybrid oxide layer with a nanoporous outer sublayer (pore size < 15 nm) and a dense inner layer. The thin hybrid oxide layer increased the corrosion resistance of the Ti-25Nb-25Zr alloy by increasing the corrosion potential and decreasing both the corrosion rate and passive current. Ti-25Nb-25Zr alloys with and without anodization treatment were non-toxic. Surface nanotopography on the anodized Ti-25Nb-25Zr alloy enhanced protein adsorption and cell adhesion. Our results demonstrate that electrochemical anodization increases the corrosion resistance and cell adhesion of β-type Ti-25Nb-25Zr alloy while providing a lower elastic modulus suitable for implant applications.

Original languageEnglish
Pages (from-to)87-92
Number of pages6
JournalThin Solid Films
Volume549
DOIs
Publication statusPublished - Dec 31 2013

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Keywords

  • Biocompatibility
  • Corrosion
  • Electrochemical anodization
  • Nanoscale hybrid oxide layer
  • Ti-25Nb-25Zr alloy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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