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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 TanA 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 scienceVolume
150Pagination
151 - 160Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0010-938XLanguage
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2019, Elsevier Ltd.Usage metrics
Keywords
Electrochemical methodCathodic protectionDisbonded coatingsCrevice corrosionLocalised corrosionElectrochemical calculationsScience & TechnologyTechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringMaterials ScienceCARBON-STEELSTRESS-CORROSIONPIPELINE STEELELECTROCHEMICAL MEASUREMENTSSOIL-MOISTUREENVIRONMENTPHINITIATIONMechanical Engineering
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