Article

Evaluation of passive film behaviour of super austenitic stainless steels at different potential regions using dynamic electrochemical impedance spectroscopy

Journal of Solid State Electrochemistry (impact factor: 2.13). 04/2012; 14(7):1197-1204. DOI:10.1007/s10008-009-0948-5 pp.1197-1204

ABSTRACT Potentiodynamic anodic polarisation and dynamic electrochemical impedance spectroscopic (DEIS) measurements were carried out
on 316L stainless steel and alloys 926 and 31 in natural seawater in order to assess the crevice corrosion resistance. DEIS
measurements were performed over a wide range of potentials covering the corrosion potential, passive region, breakdown region
and dissolution region. The impedance measurements in potentiodynamic conditions clearly reveal the changes that occur in
the passive layer with change in potential. The impedance spectra at different potential regions were also discussed elaborately.
The surface morphology of the alloy after crevice corrosion was studied using optical microscope and atomic force microscopy.

KeywordsStainless steel-Crevice corrosion-Dynamic electrochemical impedance spectroscopy-Atomic force microscopy

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Keywords

316L stainless steel
 
atomic force microscopy
 
different potential regions
 
dynamic electrochemical impedance spectroscopic
 
elaborately
 
KeywordsStainless steel-Crevice corrosion-Dynamic electrochemical impedance spectroscopy-Atomic force microscopy
 
natural seawater
 
passive layer
 
passive region
 
Potentiodynamic anodic polarisation
 
potentiodynamic conditions
 
surface morphology
 
wide range