Dissecting Coating Disbondments

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• Pipeline Condition
• External Corrosion

Main Objective

An examination of numerous coated pipeline segments is proposed, with characterization of the properties and microstructural features of both disbonded and well bonded regions on each segment received. The intent of the project is to answer a simple question that nobody in the industry can truthfully answer: what really causes a pipeline coating to disbond and fail?

Public Abstract

Adhesion of a corrosion coating to steel is by far the most important property for service. Maintaining this adhesion over long periods of time under adverse service conditions requires resistance to groundwater and cathodic protection by-products, soil stress, pipe bending, and impact damage. Despite the knowledge that adhesion is the critical property for performance, very little is really understood about coating adhesion and especially the loss of adhesion over long time frames.An examination of numerous coated pipeline segments is proposed, with characterization of the properties and microstructural features of both disbonded and well bonded regions on each segment received. This project proposes to examine vintage pipe, both sections removed from service and existing old pipelines which have been excavated. The coating adhesion will be measured and the nature of the surface characterized to establish a link between the characteristics at the coating/steel interface, the surface chemistry, and the resulting adhesion. The results of the project will provide great insight into exactly how and why coatings disbond from pipe after a long service period.

Final Report

Final Report-Draft Rev1

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Quarterly Status Reports

2nd Quarterly Status Report - Public Page

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3rd Quarterly Status Report - Public Page

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4th Quarterly Report - Public Page

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1st Quarterly StatusReport - Public Page

Quarterly_Report_Dec_2006-Public-Page.doc (26,624 bytes) [View] [Download/Save...]