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

doi:10.1016/j.corsci.2010.09.067

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

Department of Biomedical & Chemical Engineering

Research output: Contribution to journal › Article › peer-review

34 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 language	English (US)
Pages (from-to)	582-588
Number of pages	7
Journal	Corrosion Science
Volume	53
Issue number	2
DOIs	https://doi.org/10.1016/j.corsci.2010.09.067
State	Published - 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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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. / Haeri, Morteza; Goldberg, Saryn; Gilbert, Jeremy L.

In: Corrosion Science, Vol. 53, No. 2, 01.02.2011, p. 582-588.

Research output: Contribution to journal › Article › peer-review

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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.",

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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

Abstract

Keywords

ASJC Scopus subject areas

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