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Investigating effects of potential excursions and pH variations on cathodic protection using new electrochemical testing cells
journal contribution
posted on 2016-01-01, 00:00 authored by Ying HuoYing Huo, Mike Yongjun TanMike Yongjun Tan, Maria ForsythMaria ForsythExcursion from safe cathodic protection (CP) potentials occurs on buried steel pipelines due to various forms of electrical interferences such as stray currents. Variations in pH can also occur over some pipeline sections such as seashore and river crossing pipes. Currently, the exact effects of potential excursion and the pH on CP efficiency have not been sufficiently quantified preliminary due to difficulties in measuring these effects. In this work, these effects have been investigated using electrochemical cells designed to mimic the high resistivity and pH conditions observable over underground steel pipes, including a new electrochemical cell that has been designed to facilitate the effective simulation and control of pH, potential excursion and other CP testing parameters. The pH has been shown to be a key factor affecting the patterns of corrosion and CP efficiency. Localised corrosion has been found to be the dominating form of corrosion under potential excursions conditions.
History
Journal
Corrosion engineering, science and technologyVolume
51Issue
3Pagination
171 - 178Publisher
Taylor & FrancisLocation
Abingdon, Eng.Publisher DOI
ISSN
1478-422XeISSN
1743-2782Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2016, Institute of Materials, Minerals and MiningUsage metrics
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No categories selectedKeywords
steelpipelinesoil corrosioncathodic protectionstray current corrosionelectrochemical cellelectrochemical testingScience & TechnologyTechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringMaterials ScienceCORROSION RATE DETERMINATIONALTERNATING-CURRENTMILD-STEELPOLARIZATION CONDITIONSCARBON-STEELPIPELINESSOIL
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