Server maintenance is scheduled for Saturday, December 21st between 6am-10am CST.

During that time, parts of our website will be affected until maintenance is completed. Thank you for your patience.

Menu
Search
Filters
Close
Menu

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

Picture for Investigation of the mechanisms and kinetic of cathodic disbondment in seawater and soils
Available for download

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
$0.00
$20.00
$20.00

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.

Product tags
Also Purchased
Picture for Penetration of Cathodic Protection into Pipeline Coating Disbondment
Available for download

Penetration of Cathodic Protection into Pipeline Coating Disbondment

Product Number: 51317--9146-SG
ISBN: 9146 2017 CP
Author: Li Yan
Publication Date: 2017
$20.00

An experimental setup was designed to investigate the cathodic protection (CP) penetration into coating disbondment. Embedded detection probes underneath the disbondment enabled pH and steel potential measurements without disturbing the environment inside the disbondment.
Picture for 07036 PRACTICAL CONSIDERATIONS FOR UPPER LIMITS OF CATHODIC PROTECTION
Available for download

07036 PRACTICAL CONSIDERATIONS FOR UPPER LIMITS OF CATHODIC PROTECTION

Product Number: 51300-07036-SG
ISBN: 07036 2007 CP
Author: Ernest Klechka, Steven F. Daily, and Kevin C. Garrity
Publication Date: 2007
$20.00

This paper reviews the concerns of applying excessive levels of cathodic protection current to pipelines and the need for establishing an upper potential limit. Coating disbondment, hydrogen induced stress cracks, stress corrosion cracking, hard spots and the problems associated with measurement of a true polarized pipe-to-electrolyte potential are addressed.
Picture for Fusion Bonded Epoxy Coatings (FBE) and Disbondment
Available for download

Fusion Bonded Epoxy Coatings (FBE) and Disbondment

Product Number: 51316-7246-SG
ISBN: 7246 2016 CP
Author: Mehrooz Zamanzadeh
Publication Date: 2016
$20.00

In this paper, failure analysis methodology will be applied to the principal mechanisms by which FBE coatings fail during long term service; with specific application to case studies involving blistering. The case studies apply standard failure analysis techniques to determine the primary causes and modes of failures.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support