Journal
CORROSION SCIENCE
Volume 53, Issue 2, Pages 582-588Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2010.09.067
Keywords
Cobalt; EIS; Modeling studies; Potentiostatic; Passive films; Interfaces
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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. (C) 2010 Elsevier Ltd. All rights reserved.
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