10-16 June 2018
Dalhousie University
America/Halifax timezone
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Imaging and Preventing the Corrosion of Nitinol (G)

12 Jun 2018, 16:00
Dunn 101 (cap.82) (Dalhousie University)

Dunn 101 (cap.82)

Dalhousie University

Oral (Graduate Student) / Orale (Étudiant(e) du 2e ou 3e cycle) Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) T4-4 Films, surfaces and composites (DCMMP) | Films, surfaces et composites (DPMCM)


Mr Garrett LeGallais (Dalhousie University )


Nitinol (nickel-titanium) alloys have a unique property, superelasticity, which allows the manufacture of minimally invasive self-expanding stents. Nitinol is approximately composed of 50% nickel, which is known to be toxic. Therefore, corrosion resistance is key to the good biocompatibility of this material, especially considering the aggressive environment of the body. We tested the effects of the surface roughness and different passivation techniques on the corrosion resistance of nitinol using potentiodynamic measurements. Furthermore, we applied environmentally friendly treatments to nitinol, boiling in hydrogen peroxide and boiling in distilled water, which substantially improved the corrosion resistance. The effects of these treatments on the oxide layer composition and morphology was investigated using x-ray photoelectron spectroscopy, grazing incidence x-ray diffraction, and scanning electron microscopy. We found that due to these treatments a more homogeneous titanium dioxide oxide layer was formed. The pitting corrosion of nitinol was also observed in real time using a microscope. This gave us novel information about the spatial distribution of corrosion.

Primary authors

Mr Garrett LeGallais (Dalhousie University ) Dr Harm Rotermund (Dalhousie University) Mr Stefan Juckes (Dalhousie University )

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