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Related Experiment Videos

Monitoring of titanium base alloys-biofluids interface.

M V Popa1, I Demetrescu, S-H Suh

  • 1Institute of Physical Chemistry "Ilie Murgulescu", Spl. Independentei 202, PO BOX 12-194, 060021 Bucharest, Romania.

Bioelectrochemistry (Amsterdam, Netherlands)
|April 6, 2007
PubMed
Summary

This study monitored titanium implant materials in Ringer solutions, finding Ti-6Al-4Fe exhibits superior pitting corrosion resistance. Ion release stabilizes at safe levels, indicating good long-term biocompatibility for these biomaterials.

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Area of Science:

  • Biomaterials Science
  • Corrosion Engineering
  • Surface Chemistry

Background:

  • Titanium alloys are widely used in biomedical implants due to their excellent mechanical properties and biocompatibility.
  • Understanding the long-term behavior of these alloys in physiological environments is crucial for implant longevity and patient safety.
  • The passive film stability and corrosion resistance of titanium and its alloys (Ti-5Al-4V, Ti-6Al-4Fe) in simulated body fluids require detailed investigation.

Purpose of the Study:

  • To evaluate the long-term interfacial behavior of titanium, Ti-5Al-4V, and Ti-6Al-4Fe biomaterials in Ringer solutions with varying pH.
  • To assess the corrosion resistance, particularly pitting corrosion, of these implant materials under simulated physiological conditions.
  • To investigate ion release kinetics and surface changes over extended immersion periods.

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Main Methods:

  • Electrochemical monitoring (open circuit potential, pitting potential, protection potential) in Ringer 1 and Ringer 2 solutions.
  • Long-term immersion tests (up to 20,000 hours) to simulate physiological exposure.
  • Surface analysis using Atomic Force Microscopy (AFM) and X-ray Photoelectron Spectroscopy (XPS).

Main Results:

  • All biomaterials demonstrated self-passivation in Ringer 1 (high chloride).
  • Ti-6Al-4Fe alloy showed a higher pitting potential and protection potential in Ringer 2, indicating enhanced pitting corrosion resistance.
  • Ion release from the biomaterials reached a stable, low level after 400-600 hours, deemed non-hazardous.
  • AFM revealed increased surface roughness over time, suggesting dynamic interface interactions.
  • XPS confirmed the presence of protective titanium oxides (TiO(2), TiO, Ti(2)O(3)) and aluminum oxide (Al(2)O(3)) on the surfaces.

Conclusions:

  • Titanium, Ti-5Al-4V, and Ti-6Al-4Fe alloys exhibit good long-term stability in simulated physiological fluids.
  • Ti-6Al-4Fe demonstrates superior resistance to pitting corrosion compared to Ti and Ti-5Al-4V.
  • The observed surface changes and low ion release rates suggest these biomaterials are suitable for long-term implantation.