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01533 MEANING OF DISBONDING TESTS : RESULTS OF AN EUROPEAN JOINT RESEARCH PROJECT

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Product Number: 51300-01533-SG
ISBN: 01533 2001 CP
Author: L. Coudreuse
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In order to define a disbonding test procedure representative of actual service conditions, an industry join research program has been performed at an European level. A numerical approach has been used to calculate the hydrogen profiles both for laboratory test specimens and for actual reactors. It has been possible to establish relationships between the maximum amount of hydrogen at the interface and geometrical and exposure or service parameters. Laboratory test conditions representative of actual situation in a reactor wall can be defined. An experimental testing program has been conducted for one overlay condition. The results show a good correlation between the maximum hydrogen content at the interface and the disbonding test results. From both the numerical approach and experimental results, it is possible to define a critical amount of hydrogen at the interface for disbonding occurrence. Proposition are made for standardization of disbonding test conditions. Finally it is shown that the approach used can be helpful for qualification of disbonding resistance of welded or cladded overlays.
In order to define a disbonding test procedure representative of actual service conditions, an industry join research program has been performed at an European level. A numerical approach has been used to calculate the hydrogen profiles both for laboratory test specimens and for actual reactors. It has been possible to establish relationships between the maximum amount of hydrogen at the interface and geometrical and exposure or service parameters. Laboratory test conditions representative of actual situation in a reactor wall can be defined. An experimental testing program has been conducted for one overlay condition. The results show a good correlation between the maximum hydrogen content at the interface and the disbonding test results. From both the numerical approach and experimental results, it is possible to define a critical amount of hydrogen at the interface for disbonding occurrence. Proposition are made for standardization of disbonding test conditions. Finally it is shown that the approach used can be helpful for qualification of disbonding resistance of welded or cladded overlays.
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The cathodic disbondment (CD) test is a well known and generally accepted laboratory test for pipeline coatings for a long time. What are we testing and what is the significance of the test? By means of basic investigations factors influencing cathodic delamination have been identified and their extent on the delamination radius has been assessed.
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