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Probing dynamic and localised corrosion processes on buried steel under coating disbondments of various geometries
journal contributionposted 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.
Pagination151 - 160
LocationAmsterdam, The Netherlands
Publication classificationC1 Refereed article in a scholarly journal
Copyright notice2019, Elsevier Ltd.
Electrochemical methodCathodic protectionDisbonded coatingsCrevice corrosionLocalised corrosionElectrochemical calculationsScience & TechnologyTechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringMaterials ScienceCARBON-STEELSTRESS-CORROSIONPIPELINE STEELELECTROCHEMICAL MEASUREMENTSSOIL-MOISTUREENVIRONMENTPHINITIATIONMechanical Engineering