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) |
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Pages (from-to) | 582-588 |
Number of pages | 7 |
Journal | Corrosion Science |
Volume | 53 |
Issue number | 2 |
DOIs | |
State | Published - Feb 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)