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A Study of Various Parameters Affecting the Performance of Liquid-Applied Epoxy Pipeline Coatings

Picture for A Study of Various Parameters Affecting the Performance of Liquid-Applied Epoxy Pipeline Coatings
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Protective coatings provide the primary defense against corrosion of pipelines. Adhesion is one of the most crucial properties for coatings to function properly and support successful long-term integrity. If the bond between the coating and substrate is weak or deteriorates, the coating ceases to be attached to the substrate, and the coating loses its effectiveness and eventually fails.

Product Number: 51323-19474-SG
Author: Shan Rao, Haralampos Tsaprailis, Jiajun Liang
Publication Date: 2023
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$20.00
$20.00

Understanding wet adhesion behaviors of protective coatings is a subject of considerable interest, as the durability of the interfacial adhesion between coating and steel substrate is the key element in controlling coating lifetime, especially in buried or submerged conditions. Previously published work has confirmed that there are significant effects of different blast abrasives on the corrosion resistance of liquid-applied epoxy pipeline coatings. This study explores the disbondment response versus test temperature of the same coating on surfaces prepared by various abrasives. The test results are not only beneficial for selecting appropriate abrasives for specific service requirement, but also essential for the development of reliable accelerated ageing protocols to evaluate pipeline coatings. Despite the importance of surface preparation, application also plays key role in a coating’s performance and these factors (e.g., mixing ratio, variation of coating film thickness) were examined and discussed. The long-term performance prediction was verified by testing the coatings applied on the surfaces prepared by the best abrasive performers in cathodic disbondment testing and hot water immersion for extended test duration.

Understanding wet adhesion behaviors of protective coatings is a subject of considerable interest, as the durability of the interfacial adhesion between coating and steel substrate is the key element in controlling coating lifetime, especially in buried or submerged conditions. Previously published work has confirmed that there are significant effects of different blast abrasives on the corrosion resistance of liquid-applied epoxy pipeline coatings. This study explores the disbondment response versus test temperature of the same coating on surfaces prepared by various abrasives. The test results are not only beneficial for selecting appropriate abrasives for specific service requirement, but also essential for the development of reliable accelerated ageing protocols to evaluate pipeline coatings. Despite the importance of surface preparation, application also plays key role in a coating’s performance and these factors (e.g., mixing ratio, variation of coating film thickness) were examined and discussed. The long-term performance prediction was verified by testing the coatings applied on the surfaces prepared by the best abrasive performers in cathodic disbondment testing and hot water immersion for extended test duration.

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Fitness for purpose of low temperature cure liquid-applied coating systems for pipeline maintenance and repair. Potential revisions to incorporate low temperature cure liquid-applied coating products into Table 1 of CSA Z245.30-14 will be presented along with commentary related to the deviations from the standard.

 
Picture for The Effects Of Different Blast Abrasives On The Performance Of Liquid-Applied Epoxy Pipeline Coatings
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The Effects Of Different Blast Abrasives On The Performance Of Liquid-Applied Epoxy Pipeline Coatings

Product Number: 51322-17806-SG
Author: Haralampos Tsaprailis, Shan (Sherry) Rao
Publication Date: 2022
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Proper surface preparation to create sufficient adhesion of a coating over the substrate is fundamentally important in the long-life performance of a protective coating. Abrasive blast cleaning provides a fast and well-established method of surface preparation, which utilizes energy generated by an air supply to deliver a mass of abrasive particles at certain speeds and volumes to impact the steel resulting in a cleaned surface. The method not only cleans the surface to remove rust, scale, paint, and similar contaminations, but also roughens the surface to produce mechanical and chemical adhesion for a coating. Therefore, abrasive blasting is the preferred method for preparing steel for the application of high-performance coatings and routinely used for achieving the required surface conditions prior to a coating work.
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