Abstract
Corrosion protection is necessary to preserve the expected service lifetime of metallic structures. The most effective method of corrosion protection for buried or immersion service is a combination of protective coatings and cathodic protection. However, when applied improperly, cathodic protection may result in damage to the protective coating. Cathodic disbondment testing evaluates a coating’s resistance to disbondment in the presence of cathodic protection. Researchers previously compared cathodic disbondment test methods NACE(1) TM0115 and ASTM(2) G8, showing that cathodic disbondment varied based on specimen geometry, contrary to previous findings that claimed independence. Researchers designed a subsequent NACE TM0115 experiment using two coating systems and five specimen geometries to further elucidate the results of the prior study. One test set-up evaluated 2-in, 3-in, and 4-in diameter tubes as well as 4-in by 6-in flat panels in immersion, while a second applied the attached cell method. The results provide insight for how to create a more robust test method that aids in the selection of coatings systems for use in conjunction with cathodic protection.
