Monitoring pitting-crevice corrosion using the WBE-noise signatures method

Aung, N. N. and Tan, Y.-J. 2006, Monitoring pitting-crevice corrosion using the WBE-noise signatures method, Materials and corrosion, vol. 57, no. 7, pp. 555-561, doi: 10.1002/maco.200503946.

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Title Monitoring pitting-crevice corrosion using the WBE-noise signatures method
Author(s) Aung, N. N.
Tan, Y.-J.ORCID iD for Tan, Y.-J.
Journal name Materials and corrosion
Volume number 57
Issue number 7
Start page 555
End page 561
Total pages 7
Publisher Wiley - VCH Verlag GmbH & Co. KGaA
Place of publication Weinheim, Germany
Publication date 2006-07
ISSN 0947-5117
Keyword(s) wire beam electrode
electrochemical noise
crevice corrosion
localization parameter
Summary An electrochemically integrated multi-electrode array namely the wire beam electrode (WBE) and noise signatures analysis have been applied in novel combinations to study crevice corrosion behaviour in the presence of pits. Characteristic electrochemical noise signatures were found to correlate with characteristic changes in WBE current distribution maps, which indicate corrosion rates distributions, corrosion patterns and the degree of pitting and crevice corrosion. Specifically, two characteristic noise patterns were observed: (i) the characteristic noise pattern of quick potential changes towards more negative direction with no recovery (termed noise signature I) was found to correspond with the initiation and stabilization of the anode inside crevice; and (ii) the characteristic noise pattern of the cyclic potential oscillation at a constant frequency (termed noise signature II) was found to correspond with the stable anodic dissolution in the occluded cavity site in WBE current distribution maps. A new parameter namely the localization parameter (LP) has been proposed to describe the degree of localization. The LP for crevice corrosion was found to be low compared to that for pitting corrosion.
Language eng
DOI 10.1002/maco.200503946
Field of Research 091207 Metals and Alloy Materials
030604 Electrochemistry
030301 Chemical Characterisation of Materials
Socio Economic Objective 870302 Metals (e.g. Composites, Coatings, Bonding)
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2006, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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