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Surface treatment, corrosion behavior, and apatite‐forming ability of Ti‐45Nb implant alloy
Author(s) -
Gostin Petre F.,
Helth Arne,
Voss Andrea,
Sueptitz Ralph,
Calin Mariana,
Eckert Jürgen,
Gebert Annett
Publication year - 2013
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.32836
Subject(s) - apatite , materials science , alloy , simulated body fluid , scanning electron microscope , corrosion , biocompatibility , surface roughness , titanium , titanium alloy , etching (microfabrication) , oxidizing agent , chemical engineering , surface finish , isotropic etching , metallurgy , composite material , layer (electronics) , chemistry , organic chemistry , engineering
Abstract The low modulus β‐type Ti‐45Nb alloy is a promising new implant alloy due to its excellent mechanical biocompatibility and composition of non‐toxic elements. The effect of surface treatments on the evolution of controlled topography and roughness was investigated by means of scanning electron microscopy and optical profilometry. Severe mechanical treatments, for example sand‐blasting, or etching treatments in strongly oxidizing acidic solutions, like HF:HNO 3 (4:1) or H 2 SO 4 :H 2 O 2 (1:1) piranha solution were found to be very effective. In particular, the latter generates a nanopatterned surface topography which is expected to be promising for the stimulation of bone tissue growth. Compared to Ti and Ti‐6Al‐4V, the β‐type Ti‐45Nb alloy requires significantly longer etching durations due to the high chemical stability of Nb. Severe surface treatments alter the passive film properties, but do not deteriorate the outstanding corrosion resistance of the Ti‐45Nb alloy in synthetic body fluid environments. The Ti‐45Nb appears to have a lower apatite‐formation ability compared to Ti. Etching with H 2 SO 4 :H 2 O 2 (1:1) piranha solution inhibits apatite formation on Ti, but not on Ti‐45Nb. © 2012 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2013.