The voltage-dependent electrochemical impedance spectroscopy of CoCrMo medical alloy using time-domain techniques: Generalized Cauchy-Lorentz, and KWW-Randles functions describing non-ideal interfacial behaviour

Morteza Haeri, Saryn Goldberg, Jeremy L. Gilbert

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

In this study, we examined the change of interfacial properties of a CoCrMo biomedical alloy (ASTM F-1537) in phosphate-buffered saline (PBS) (pH 7.4) at different voltages. Step polarization impedance spectroscopy technique was used to apply 50. mV voltage steps to samples, and the time-based current transients were recorded. A new equation is derived based on capacitive discharge through a Tafel element and generalized to deal with non-ideal impedance behaviour. The new function compared to the KWW-Randles function, better matches the time-transient response. The results also show a voltage-dependent oxide resistance and capacitance behaviour.

Original languageEnglish (US)
Pages (from-to)582-588
Number of pages7
JournalCorrosion Science
Volume53
Issue number2
DOIs
StatePublished - Feb 1 2011

Keywords

  • A. Cobalt
  • B. EIS
  • B. Modeling studies
  • B. Potentiostatic
  • C. Interfaces
  • C. Passive films

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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