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Investigation of the mechanisms and kinetic of cathodic disbondment in seawater and soils

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Cathodic protection is used in addition to organic coatings to ensure the integrity of offshore and onshore buried structures against corrosion. The cathodic protection efficiency is usually ensured by keeping the potential of the structure to be protected in a narrow range following standard recommendations such as ISO 15589-1 and/or NF EN 12954. For onshore buried structures, this potential range is limited by the protection potential Ep and the limit potential El.

Product Number: 51323-19258-SG
Author: Erwan Diler, Krystel Pelissier, Abdelkader Meroufel, Nicolas Larche
Publication Date: 2023
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$20.00
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To ensure the integrity of offshore and onshore buried structures against corrosion, a complementary approach combining cathodic protection (CP) and organic coatings is used. Following the ISO 15589-1, the efficiency of the CP is ensured by maintaining the CP potential within a protective range with a critical limit potential value of -1.200 V/CuCuSO4. This latter, beyond the hydrogen embrittlement risk, was mainly defined to limit the cathodic disbondment (CD). For onshore buried structures, lower potentials were observed in the field. The influence of over cathodic protection on the coating is rather complex since it depends on many factors such as the nature of the coating, the media, the temperature, the electrochemical processes and the kinetic involved. In the literature, many CD testing procedures are discussed in terms of testing parameters. For instance, existing procedures are usually limited to chloride containing electrolytes that are not representative of underground environment. In this study, CD tests between 28 days and 12 months were realized in soils and seawater at different potentials on Fusion Bonded Epoxy (FBE) and three layers Polyethylene (3LPE) coatings. Different CD rate were observed in these medias, with in soils a strong influence of the moisture level.

To ensure the integrity of offshore and onshore buried structures against corrosion, a complementary approach combining cathodic protection (CP) and organic coatings is used. Following the ISO 15589-1, the efficiency of the CP is ensured by maintaining the CP potential within a protective range with a critical limit potential value of -1.200 V/CuCuSO4. This latter, beyond the hydrogen embrittlement risk, was mainly defined to limit the cathodic disbondment (CD). For onshore buried structures, lower potentials were observed in the field. The influence of over cathodic protection on the coating is rather complex since it depends on many factors such as the nature of the coating, the media, the temperature, the electrochemical processes and the kinetic involved. In the literature, many CD testing procedures are discussed in terms of testing parameters. For instance, existing procedures are usually limited to chloride containing electrolytes that are not representative of underground environment. In this study, CD tests between 28 days and 12 months were realized in soils and seawater at different potentials on Fusion Bonded Epoxy (FBE) and three layers Polyethylene (3LPE) coatings. Different CD rate were observed in these medias, with in soils a strong influence of the moisture level.

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Product Number: 51322-17587-SG
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A Case Study on Diagnostic Investigation of Cathodic Protection System Requirement and Performance Review for Concrete Piles

Product Number: 51319-13048-SG
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The construction of a port expansion project in Arabian Gulf for a major operator included the surface based structures such as capping beams and reinforced concrete piles. In 2008 a criticality assessment study was conducted that established the requirement of an impressed current cathodic protection system for all piles included in the structure. The installed ICCP system was commissioned in August 2011 and was remotely monitored by an Aegis Remote Monitoring System (ARMS). The monitoring data showed that all the surface based structures such as capping beams adhered to the requirements of BS EN 12696 with regards to polarization and depolarization. However the reinforced concrete piles showed an initial negative polarization followed by a steady state condition. Thereafter the polarization project requirements were not achieved till 2014. Later in 2014 Penspen was requested by operator and contractor to conduct a diagnostic investigation and review the condition of the ICCP system and the requirement for cathodic protection for the piles. This paper describes the methodology used in the investigation discussion and analysis the results and the key findings.Keywords: Impressed Current Cathodic Protection System (ICCP)Aegis Remote Monitoring System (ARMS)
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Cathodic Protection Coupon Use for Buried Piping in Plant (i.e. Complex) Facilities

Product Number: 51317--8824-SG
ISBN: 8824 2017 CP
Author: Douglas Gilroy
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