The Cathodic Disbondment test simulates conditions on pipelines where cathodic protection is being used.
It examines the ability of a coating, under immersion conditions, to withstand the stresses imposed by an electric potential. Intentional holidays in the coating create local reactions resulting in a highly caustic environment. The temperature of the solution in which the samples are immersed and the electrical potential for the test are varied in order to better simulate field conditions and determine the resistance of the coating to disbondment around the intentional holiday.
|Room Temperature||High Temperatue|
|Charter Coating’s CD Test Set-up|
4” x 4” (100 mm x 100 mm) one-side coated flat panels (CSA Z245.20 / CSA Z245.21)
5” x 5” (127 mm x 127 mm) one-side coated flat panels (ASTM G95)
Min. 8” length x 4” diameter (200 mm L x 400 mm OD) externally coated pipe sections (ASTM G8 and G42)
Min. 3” x 6” x 0.1” ( 150 mm x 70 mm x 2 mm) one-side coated flat panels (ISO 15711)
Temperature: 20 to 95°C (68 to 200°F) as per standard requirement or modified higher or lower temperatures as per client’s request
Electrolyte: 3% NaCl or a mixture of various salts depending on the test method
CSA Z245.20 Section 12.8
CSA Z245.21 Section 12.3
NACE TM0115, TM0304, TM0404, SP0934
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