The coating application temperature, degree of cure, and film thickness were examined to observe which has the largest effect on cathodic disbondment of fusion-bonded epoxy (FBE) coating. Cathodic disbondment is selected as the key performance test for adhesion because it stimulates field condition for disbonding of a coating from a pipeline. For a conventional and new generation FBE coating, the cure varied from 70% to 100% by changing the time to quench after powder application. With a film thickness of 175 to 200 micrometer, new FBE has a disbondment of 2.4 mm at 70% cure and a disbondment of 1.8 mm at 99.9% cure. The new FBE is used where superior cathodic disbondment performance is needed, and low application temperatures were desired. Low application temperature will tend to give a lower degree of cure, which will give poor cathodic disbondment performance. The cathodic disbondment performance of conventional and new generation FBE coating improves with an increase of cure percentage.
Application temperature, cure, and film thickness affect cathodic disbondment of FBE coatings
Einfluss von Anwendungstemperatur, Aushärtung und Schichtdicke auf die kathodische Enthaftung von Epoxidharz-Pulverbeschichtungen
Materials Performance ; 45 , 6 ; 24-28
2006
5 Seiten, 8 Quellen
Article (Journal)
English
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