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Effect of Surface Preparation on Residual Stresses in Multilayer Coatings and the Consequences for Disbondment Following Construction Damage and Exposure to In-Service Stress
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2009-01-01
[PDF-2.99 MB]
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Alternative Title:Effect of Surface Preparation on Residual Stress in Multi-layer and Other Pipeline Coatings
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TRIS Online Accession Number:01642982
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Edition:Final Report
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Abstract:Underground pipelines are protected by a combination of cathodic protection and a protective coating. Multi-layer coatings offer protection against corrosion and from mechanical damage during construction or during service. Multi-layer coatings are widely used in Europe and other countries but have not been used as extensively in North America despite offering advantages in terms of combined corrosion and impact resistance. The aim of this investigation is to improve the performance of multi-layer coatings through an understanding of the factors that affect the level of residual stress in the coating and ultimately, the consequences for coating disbondment. This report describes research to understand the effect of surface preparation and coating aging on the distribution of residual stress in plant applied HPCC and the consequences of in-service performance. Although it is known that the current manufacturing processes lead to the introduction of residual stress in multi-layer coatings, the magnitude of these stresses and the consequences for coating performance are unknown.
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