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A review of cathodic disbondment test (CDT) methods from standard organizations such as ASTM, ISO, CSA, NF and AS is presented in this paper.
A review of cathodic disbondment test (CDT) methods from standard organizations such as ASTM, ISO, CSA, NF and AS is presented in this paper. Factors affecting CDT such as substrate and electrolyte temperature, anode configuration, anolyte isolation, electrolyte composition, voltage gradients and methods of heating are examined. These factors can significantly affect the rate of disbondment, the mechanism of failure and the relationship to field performance. The information provided is applicable to selecting appropriate methods for product specification and realistic interpretation of data for evaluating coating performance.
Keywords: cathodic disbondment, coatings, buried pipeline
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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The research described in this paper was carried out with the objective of establishing any correlation between coating performance and the results of cathodic disbondment testing. Experiments were carried out using 13 coatings. Nine samples of each coating were studied in a total of 117 experiments.
This paper will consider the performance and relevance to static situations of the key types of Cathodic dip painting (CDP) Antifoulings (Rosin Modified types), the current tin free polishing types (typically acrylates of various types), and low energy surface types. Both field experience and laboratory work will be considered.