The effect of static applied potential on the 24-hour impedance behavior of commercially pure titanium in simulated biological conditions

Mark T. Ehrensberger, Jeremy L. Gilbert

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Potential step impedance analysis was utilized to evaluate the electrochemical impedance of commercially pure titanium (cpTi) samples that were polarized to static potentials (range from 21000 mV to +1000 mV vs. Ag/AgCl) and immersed in physiologically relevant electrolytes [phosphate buffered saline (PBS) and cell culture medium with 10% fetal bovine serum (AMEM + FBS)] for 24 hrs. The cpTi impedance outcomes were a complex function of voltage, solution constituents, and immersion time. In the 0 mV to +1000 mV range, oxide growth was observed over 24 hr immersion in both solutions based on decreasing current density (∼10-6 A/cm2 to ∼10-8 A/cm 2) and increasing Rp (200 kΩ cm2 to ∼10 MΩ cm2). Below 0 mV, the 24 hr Rp decreased with negative potential to ∼15 kX cm2. After 24 hr immersion, oxide dissolution and/or adsorption of organic species caused the capacitance to increase at -1000 mV (AMEM + FBS & PBS) and at -600 mV (AMEM + FBS only). Twenty-four hours of immersion in AMEM + FBS at -1000 mV and -600 mV produced a surface coloration that is likely due to alteration of oxide valance state and/or doping level. This work shows that Ti surface oxide and its electrochemical behavior can be altered dramatically under sustained cathodic potentials.

Original languageEnglish (US)
Pages (from-to)106-112
Number of pages7
JournalJournal of Biomedical Materials Research - Part B Applied Biomaterials
Volume93
Issue number1
DOIs
StatePublished - Apr 1 2010

Keywords

  • Corrosion
  • Electrochemical impedance
  • Proteins
  • Titanium
  • Voltage effects

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering

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