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Coating Failure Consequences to CP Shielding

SKU: GRI-04/0162
Coating Failure Consequences to CP Shielding

The objective of this project was to better understand the failure mechanisms of pipeline coatings, and to determine if the coating damage is conducive to external corrosion or stress corrosion cracking (SCC). The focus was on coatings where the failure mechanism and consequence of coating damage are not fully understood.
Document Type
Report
Report Type
Final Report
Corporate Source
Case Western Reserve University
Sponsor
Gas Research Institute, Des Plaines, IL
Pagination
67p
Product Media
PDF Download
$295.00 / Each
 
Availability: In Stock
Summary:
TThe objective of this project was to better understand the failure mechanisms of pipeline coatings, and to determine if the coating damage is conducive to external corrosion or stress corrosion cracking (SCC). The focus was on coatings where the failure mechanism and consequence of coating damage are not fully understood. The selected coating system for study was a 3-layer coating comprised of an inner layer of a fusion bonded epoxy (FBE) coating; an intermediate adhesive layer of copolymer polypropylene; and an outer layer of extruded polypropylene. Since the primary area of concern for the 3-layer coatings is the possibility of coating damage from penetrations in the coating, the coatings in this study were intentionally damaged with through-coating penetrations or by removal of portions of the outer layers prior to testing. The 3-layer coating behavior was determined by cathodic disbonding tests and water soak tests done individually and in combination. Two forms of coating degradation were observed: disbonding of the coating at the FBE/steel interface and loss of adhesion strength. Detailed objectives, procedures, and results of the various tests are presented, and implications of the research are discussed.
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