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Measuring and understanding the critical duration and amplitude of anodic transients
journal contribution
posted on 2018-01-01, 00:00 authored by Ying HuoYing Huo, Mike Yongjun TanMike Yongjun TanAnodic transients are known to affect buried pipeline cathodic protection (CP) systems; however, their actual effects on pipeline corrosion have not been sufficiently quantified due to the lack of direct experimental evidences. In this work, a novel methodology developed based on an electrochemically integrated multi-electrode array has been used to visualise the dynamic effects of anodic transients on localised corrosion processes occurring on buried steel surfaces. It is shown that anodic transients do not necessarily cause steel corrosion, as long as their amplitude and duration are below critical values. The electrode array is able to determine these critical values accurately due to its ability to detect localised corrosion initiation, while the conventional coupon electrode is only able to estimate these values. The critical anodic transient duration has been explained as the incubation period for the breakdown of passivity formed on the steel surface exposed to CP-generated high pH conditions.
History
Journal
Corrosion engineering, science and technologyVolume
53Issue
1Pagination
65 - 72Publisher
Taylor & FrancisLocation
Abingdon, Eng.Publisher DOI
ISSN
1478-422XeISSN
1743-2782Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2017, Institute of Materials, Minerals and MiningUsage metrics
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No categories selectedKeywords
steel pipelinesoil corrosioncathodic protectionstray current corrosionanodic transientselectrochemical testingScience & TechnologyTechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringMaterials ScienceCATHODIC POLARIZATION CONDITIONSCORROSION RATE DETERMINATIONELECTROCHEMICAL METHODSALTERNATING-CURRENTPITTING CORROSIONCARBON-STEELPROTECTIONPIPELINES
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