Electrochemical Impedance Spectroscopy: Insights for fretting corrosion experiments

Using Electrochemical Impedance Spectroscopy (EIS), in the tribocorrosion field, especially in fretting corrosion, is new. The key point of this work is using EIS. The influence of ionic strength (Ic) and a model protein, albumin, on passive layer behavior was studied. At cathodic applied potential,...

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Bibliographic Details
Published in:Tribology international 2013-12, Vol.68, p.67-76
Main Authors: Geringer, J., Pellier, J., Taylor, M.L., Macdonald, D.D.
Format: Article
Language:English
Subjects:
316L SS
Albumin
Albumins
Bioengineering
Biomaterials
Biomechanics
Chemical and Process Engineering
Corrosion inhibitors
Electrochemical impedance spectroscopy
Engineering Sciences
Fretting
Fretting corrosion
Ionic strength
Life Sciences
Mechanics
Physics
Polarization
Strength
Tribology
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Summary:Using Electrochemical Impedance Spectroscopy (EIS), in the tribocorrosion field, especially in fretting corrosion, is new. The key point of this work is using EIS. The influence of ionic strength (Ic) and a model protein, albumin, on passive layer behavior was studied. At cathodic applied potential, E=−400mV(SCE), fretting leads to an increase of corrosion current, without albumin. The current drop increases with the ionic strength. With albumin of 20gL−1, I is constant whatever the ionic strength: albumin acts as a corrosion inhibitor. Thanks to EIS, the degradation of passive layer due to fretting-corrosion is assessed by the fall of Polarization Resistance (Rp) and exponent of constant phase element (n), and the rise of constant phase element (Q). ► EIS is dedicated to describe fretting corrosion of 316L SS. ► Equivalent electrical circuit allows following the influence of chemical parameters. ► Albumin does protect 316L SS during fretting corrosion.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2012.10.027