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

journal contribution
posted on 2006-07-01, 00:00 authored by N Aung, Mike Yongjun TanMike Yongjun Tan
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.

History

Journal

Materials and corrosion

Volume

57

Issue

7

Pagination

555 - 561

Publisher

Wiley - VCH Verlag GmbH & Co. KGaA

Location

Weinheim, Germany

ISSN

0947-5117

eISSN

1521-4176

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2006, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim