Abstract
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.
