4.4 Article

Effect of Nitinol Surface Treatments on Its Physico-Chemical Properties

Publisher

WILEY
DOI: 10.1002/jbm.b.31407

Keywords

prosthesis; metal (alloys); metal ions; biocompatibility/hard tissue; titanium (alloys)

Funding

  1. Spanish Nanoscience Action [NAN200409270-C3-1/2]
  2. Consolider Ingenio 2010 program [CSD2006-00012]
  3. Ramon y Cajal program

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The main purpose of this work is the study of different physicochemical treatments on Nitinol slabs and wires, with the aim of inducing the formation of a TiO2 surface film capable of increasing the corrosion resistance of the material and of reducing the release of Ni when the Nitinol samples were immersed in simulated body fluid (SBF). To this end, a battery of measurements (surface roughness, contact angle, electrochemical corrosion, chemical analysis as a function of depth, and Ni release to SBF) has been used to characterize Nitinol commercial samples, as received, and also after the different treatments performed. The results clearly indicate the effectiveness of the passivation TiO2 layer as a barrier against Ni leaching, and the detrimental effects of any processes (such as polishing or cutting) that result in exposure of areas not coated by the TiO2 film. Chemical methods such as oxidation in nitric acid or hydrothermal treatment of the samples (by prolonged immersion in boiling water) seem to provide simple and efficient ways of forming TiO2 films of adequate thickness on the Nitinol surface. (C) 2009 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 91B: 337-347, 2009

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