Corrosion is one of the most serious deterioration problems in seawater pipelines that are used in various industries. Epoxy-based coatings are commonly applied as an internal protection lining for these pipes but due to its porous structure and hydrophilicity, seawater can still diffuse to the steel substrate and can cause localized corrosion. This study aims to determine the effectiveness of ceramic-epoxy composites in preventing corrosion from steel substrates. Three industrial coatings were used for this study—Hempadur 35530 (pure epoxy), Ceramic polymer 232 and Proguard CN 200 (ceramic-epoxy composites). Different electrochemical tests were done to assess the ability of these epoxy-based coatings to inhibit corrosion of steel. Cathodic disbondment test showed that among the coatings used in this study, only Proguard CN 200 exhibited good adhesion after intense electrochemical reaction in the steel-coating interface while the other two coatings showed abrasions and pitting on the surface from their SEM images. Open circuit potential values proved that all coatings had greater corrosion potential than bare mild steel, thus serving their purpose to inhibit corrosion in pipes. Tafel plots were generated to calculate the corrosion rate and corrosion inhibition efficiency and the result showed that ceramic epoxy coatings were approximately 15% more efficient than epoxy coating alone. Thus, incorporating nanofillers like ceramics into epoxy matrices is essential in improving the anti-corrosion property of epoxy coatings.

Anti-corrosion property of epoxy-based coatings in seawater pipelines

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ACS Fall 2022

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