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Probing dynamic and localised corrosion processes on buried steel under coating disbondments of various geometries

journal contribution
posted on 2019-04-15, 00:00 authored by Ke Wang, Bob VarelaBob Varela, Mike Yongjun TanMike Yongjun Tan
A specially designed multi-electrode array has been utilised to visualise dynamic steel corrosion under disbonded coatings (CUD). The behaviour of CUD was found to be distinctively different under coating disbondments of different gap sizes and in saturated and non-saturated soils. In saturated soil, CUD behaved similarly as it usually does in electrolyte solutions, where CUD is mitigated by a cathodic protection induced high pH environment and a concentration polarisation mechanism. In non-saturated soil, CUD behaviour changed significantly with coating disbondment gap size. These observations have been explained by solution/soil distribution models proposed for coating disbondment of different geometries.

History

Journal

Corrosion science

Volume

150

Pagination

151 - 160

Publisher

Elsevier

Location

Amsterdam, The Netherlands

ISSN

0010-938X

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2019, Elsevier Ltd.