Nanotube oxide coating on Ti-29Nb-13Ta-4.6Zr alloy prepared by self-organizing anodization

Hiroaki Tsuchiya, Jan M. Macak, Andrei Ghicov, Yee Chin Tang, Shinji Fujimoto, Mitsuo Niinomi, Toshiharu Noda, Patrik Schmuki

Research output: Contribution to journalArticlepeer-review

110 Citations (Scopus)


The present paper reports on the formation of self-organized nanotube oxide layers on β-type Ti-29Nb-13Ta-4.6Zr alloy in (NH4)2SO4 containing a small amount of NH4F. Highly ordered nanotube layers can be formed on the alloy under a wide range of applied potentials. Initiation and self-organization of pores is a potential and time dependent process. Layers removed from the electrolyte in an early growth state consist of two different morphologies-an outer nanoporous structure and an underneath ordered nanotube layer. For extended anodization, the outer nanoporous layer is completely dissolved. Within subsequent growth stages multi-scale ordering of the nanotube arrays with two discrete geometries can be observed. The different stages and morphologies depend significantly on the anodizing potentials. Clearly - compared with anodic tubes on pure Ti - a much broader range of nanotube geometries i.e. "structural flexibility" can be achieved with the Ti-29Nb-13Ta-4.6Zr alloy.

Original languageEnglish
Pages (from-to)94-101
Number of pages8
JournalElectrochimica Acta
Issue number1
Publication statusPublished - 2006 Oct 5
Externally publishedYes


  • Anodic oxidation
  • Biomedical alloy
  • Nanotubes
  • Porous layer
  • Self-organization

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry


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