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In vitro corrosion behaviour of Ti–Nb–Sn shape memory alloys in Ringer’s physiological solution

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Abstract

The nearly equiatomic Ni–Ti alloy (Nitinol) has been widely employed in the medical and dental fields owing to its shape memory or superelastic properties. The main concern about the use of this alloy derives form the fact that it contains a large amount of nickel (55% by mass), which is suspected responsible for allergic, toxic and carcinogenic reactions. In this work, the in vitro corrosion behavior of two Ti–Nb–Sn shape memory alloys, Ti–16Nb–5Sn and Ti–18Nb–4Sn (mass%) has been investigated and compared with that of Nitinol. The in vitro corrosion resistance was assessed in naturally aerated Ringer’s physiological solution at 37°C by corrosion potential and electrochemical impedance spectroscopy (EIS) measurements as a function of exposure time, and potentiodynamic polarization curves. Corrosion potential values indicated that both Ni–Ti and Ti–Nb–Sn alloys undergo spontaneous passivation due to spontaneously formed oxide film passivating the metallic surface, in the aggressive environment. It also indicated that the tendency for the formation of a spontaneous oxide is greater for the Ti–18Nb–5Sn alloy. Significantly low anodic current density values were obtained from the polarization curves, indicating a typical passive behaviour for all investigated alloys, but Nitinol exhibited breakdown of passivity at potentials above approximately 450 mV(SCE), suggesting lower corrosion protection characteristics of its oxide film compared to the Ti–Nb–Sn alloys. EIS studies showed high impedance values for all samples, increasing with exposure time, indicating an improvement in corrosion resistance of the spontaneous oxide film. The obtained EIS spectra were analyzed using an equivalent electrical circuit representing a duplex structure oxide film, composed by an outer and porous layer (low resistance), and an inner barrier layer (high resistance) mainly responsible for the alloys corrosion resistance. The resistance of passive film present on the metals’ surface increases with exposure time displaying the highest values to Ti–18Nb–4Sn alloy. All these electrochemical results suggest that Ti–Nb–Sn alloys are promising materials for biomedical applications.

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Authors and Affiliations

  1. Politecnico di Torino, Dipartimento di Scienza dei Materiali e Ingegneria Chimica (DICHI), Corso Duca degli Abruzzi 24, 10129, Torino, Italy

    F. Rosalbino & G. Scavino

  2. Universita` degli Studi di Genova, Dipartimento di Chimica e Chimica Industriale (DCCI), Via Dodecaneso 31, 16146, Genoa, Italy

    D. Macciò & A. Saccone

Authors
  1. F. Rosalbino
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  2. D. Macciò
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  3. G. Scavino
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  4. A. Saccone
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Correspondence to F. Rosalbino.

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Rosalbino, F., Macciò, D., Scavino, G. et al. In vitro corrosion behaviour of Ti–Nb–Sn shape memory alloys in Ringer’s physiological solution. J Mater Sci: Mater Med 23, 865–871 (2012). https://doi.org/10.1007/s10856-012-4560-3

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  • DOI: https://doi.org/10.1007/s10856-012-4560-3

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