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Effects and Consequences of an Alkali-Induced Cathodic Environment on Coating Aging
RISE Research Institutes of Sweden, Materials and Production, Corrosion.ORCID iD: 0000-0002-0916-5851
RISE Research Institutes of Sweden, Materials and Production, Corrosion.ORCID iD: 0000-0002-6347-994x
Université de Lorraine, France.
Université de Lorraine, France.
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2023 (English)In: Coatings, ISSN 2079-6412, Vol. 13, no 11, article id 1949Article in journal (Refereed) Published
Abstract [en]

The use of organic coatings in conjunction with cathodic protection (CP) for buried structures is the usual method for protecting steel against corrosion. When the organic coating loses its protective ability, regardless of the reason, the CP becomes the active protection, leading to a specific local environment. This environment can be characterized by high alkalinity, which can be detrimental for the coated structure, either by weakening the steel–coating interface or by the chemical aging of the coating. Thus, the coating must be compatible with CP and able to sustain aging under an alkaline environment. In this study, the susceptibility to alkaline aging and its consequences in regards to coating performance have been investigated for two commercial coatings used for buried structures—fusion bonded epoxy (FBE) and liquid epoxy (LE)—in free membrane and coated steel configurations. The results showed a clear impact of alkaline aging on the studied LE, leading to a significant reduction in coating resistance and ultimately, failure of the steel–coating interface, whereas the studied FBE remained stable. The presented results relate to a precise formulation of LE and FBE; however, the proposed chemical method appears to be relevant and shows the necessity of considering such specific aging results for coating specifications and improvements.

Place, publisher, year, edition, pages
Multidisciplinary Digital Publishing Institute (MDPI) , 2023. Vol. 13, no 11, article id 1949
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Materials Engineering
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URN: urn:nbn:se:ri:diva-69301DOI: 10.3390/coatings13111949Scopus ID: 2-s2.0-85177812216OAI: oai:DiVA.org:ri-69301DiVA, id: diva2:1826152
Note

Funding: This research received no external funding.

Available from: 2024-01-11 Created: 2024-01-11 Last updated: 2024-01-11Bibliographically approved

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Pélissier, KrystelDiler, ErwanLarché, Nicolas

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