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07021 MODIFIED CATHODIC DISBONDMENT TESTING OF EXTERNAL POLYMERIC PIPELINE COATINGS

Picture for 07021 MODIFIED CATHODIC DISBONDMENT TESTING OF EXTERNAL POLYMERIC PIPELINE COATINGS
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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.

Product Number: 51300-07021-SG
ISBN: 07021 2007 CP
Author: Sankara Papavinasam, Michael Attard, and R.Winston Revie
Publication Date: 2007
Industries: Cathodic Protection , Coatings and Linings
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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. Fifty-eight (58) samples were placed in an environmental chamber at a constant temperature of 65°C, and 59 samples were placed in a different environmental chamber at a temperature that varied between 5 and 65°C. The initial temperature of this environmental chamber was 5°C and, after 30 days, the temperature was raised to 15°C. The temperature in the fluctuating chamber was increased by 10°C after every 30 days. Data were obtained from cathodic current, solution pH, and potential during the experiments and cathodic disbondment after the experiments. Based on the experiments carried out over a period of 14 months using 13 different pipeline coatings, in this investigation it was found that characteristic current spikes occurred whenever blisters are formed on the coatings.

Keyword: coatings, cathodic disbondment, cathodic current, solution pH

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. Fifty-eight (58) samples were placed in an environmental chamber at a constant temperature of 65°C, and 59 samples were placed in a different environmental chamber at a temperature that varied between 5 and 65°C. The initial temperature of this environmental chamber was 5°C and, after 30 days, the temperature was raised to 15°C. The temperature in the fluctuating chamber was increased by 10°C after every 30 days. Data were obtained from cathodic current, solution pH, and potential during the experiments and cathodic disbondment after the experiments. Based on the experiments carried out over a period of 14 months using 13 different pipeline coatings, in this investigation it was found that characteristic current spikes occurred whenever blisters are formed on the coatings.

Keyword: coatings, cathodic disbondment, cathodic current, solution pH

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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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07036 PRACTICAL CONSIDERATIONS FOR UPPER LIMITS OF CATHODIC PROTECTION

Product Number: 51300-07036-SG
ISBN: 07036 2007 CP
Author: Ernest Klechka, Steven F. Daily, and Kevin C. Garrity
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This paper reviews the concerns of applying excessive levels of cathodic protection current to pipelines and the need for establishing an upper potential limit. Coating disbondment, hydrogen induced stress cracks, stress corrosion cracking, hard spots and the problems associated with measurement of a true polarized pipe-to-electrolyte potential are addressed.
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