The effect of barite, silica, and alumina fillers on the cathodic disbondmentand corrosion resistance of epoxy phenolic coating

Corrosion poses a significant financial burden on industries in both developed and developingnations. Coating systems are the most widely used and effective method for protecting equipmentfrom corrosion. However, organic coatings can develop defects due to various factors, such asimproper surface preparation or thermal and mechanical stresses applied after application. In thesecases, cathodic protection, another protective system, is employed as a complementary technique.While cathodic protection protects exposed areas where the organic coating is compromised, thecurrent it generates also creates an alkaline environment at the coating-metal interface. This alkalinityweakens the adhesion between the coating and the metal surface, leading to a phenomenon known ascathodic disbondment. This research investigated the effects of silica, alumina, and barite fillers oncathodic disbondment and the corrosion resistance of epoxy phenolic coatings. The epoxy phenolicformulation containing barite filler exhibited the lowest degree of cathodic disbondment. Conversely,the highest corrosion resistance, measured at ۱۲.۱۴x۲۱۱ ohm cm², was achieved with the epoxyphenolic containing mixed fillers, as determined by the EIS test. Our findings revealed no directcorrelation between cathodic disbondment and corrosion resistance for the coatings.

کلیدواژه ها:

Coating ، Epoxy phenolic ، Cathodic disbondment ، Corrosion resistance ، Filler