A modified cathodic disbondment (CD) test was carried out over a period of 14 months using 13 different pipeline coatings. During the test the current was recorded every 4 h. Certain types of coatings developed blisters after 60 days. The formation of the blisters resulted in characteristic spikes in the current. Other modes of failures—wrinkling, disbondment, and slipping—did not exhibit such current spikes. By conducting the CD test for a minimum duration of 60 days and by recording the current during the test, the susceptibility of coating to blistering can be evaluated, making the CD test even more useful.

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NACE International
2009
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