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Pit initiation on nitinol in simulated physiological solutions.

Bruce G Pound1

  • 1Exponent, 149 Commonwealth Drive, Menlo Park, California, 94025.

Journal of Biomedical Materials Research. Part B, Applied Biomaterials
|August 24, 2017
PubMed
Summary

Inclusions initiate pitting corrosion on nitinol (nickel-titanium alloy) wires. The size of inclusions, leading to titanium depletion, is the primary factor, not the inclusion type.

Keywords:
inclusionsnitinolpitting corrosionpotentiodynamic polarizationscanning electron microscopy

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Area of Science:

  • Materials Science
  • Corrosion Science
  • Biomaterials Engineering

Background:

  • Inclusions are implicated in pitting corrosion initiation on nitinol.
  • The specific role and type of inclusions in nitinol pitting remain unclear.

Purpose of the Study:

  • To investigate the role of inclusions in the initiation of pitting corrosion on electropolished nitinol wire.
  • To determine if inclusion type is a critical factor in pit initiation.

Main Methods:

  • Potentiodynamic polarization
  • Scanning electron microscopy (SEM)
  • Energy dispersive X-ray spectroscopy (EDS)

Main Results:

  • Corrosion was limited to single primary pits on tested nitinol wires.
  • Identified Ti2NiOx inclusions within primary pits.
  • Secondary pits forming within primary pits indicated inclusions as initiation sites.
  • Titanium depletion in the alloy matrix adjacent to inclusions provides the most viable explanation for pit initiation.

Conclusions:

  • Inclusion size, influencing titanium depletion, is the key factor in nitinol pitting initiation.
  • Inclusion type plays a minor, secondary role in the pitting process.