Study on the formation of an apatite layer on NiTi shape memory alloy using a chemical treatment method

M. F. Chen, X. J. Yang, Y. Liu, S. L. Zhu, Z. D. Cui, Hau Chung Man

Research output: Journal article publicationJournal articleAcademic researchpeer-review

105 Citations (Scopus)

Abstract

A chemical treatment method has been employed to prepare a bioactive layer on the surface of NiTi alloy. Prior to forming an apatite layer, all samples were dipped in 32.5% HNO3aqueous solution and boiled in 1.2 M NaOH aqueous solution. Then, they were soaked in simulated body fluid (SBF) to form an apatite layer on the surface. The surfaces of chemically treated NiTi alloys were characterized by X-ray diffraction (XRD), X-ray photoemission spectroscopy (XPS) and environment scanning electron microscopy (ESEM). The results showed that a passive oxide film had been formed on NiTi treated with nitric acid, which mainly consisted of TiO2and TiO. A sodium titanate hydrogel layer and Ni2O3were formed on the surface treated by NaOH. After the above chemical treatment, an apatite layer was spontaneously deposited onto the surface when the samples were soaked in SBF. This revealed that a bioactive layer could be obtained by chemical treatment.
Original languageEnglish
Pages (from-to)229-234
Number of pages6
JournalSurface and Coatings Technology
Volume173
Issue number2-3
DOIs
Publication statusPublished - 22 Aug 2003

Keywords

  • Apatite layer
  • Chemical treatment
  • Nickel-titanium alloy
  • Simulated body fluid

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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