Surface-modified cerium oxide as a corrosion inhibitor to enhance the performance of epoxy coatings

Purpose The study aims to investigate the anticorrosion performance of epoxy coatings using modified cerium oxide (CeO 2 ) by terephthalic acid (CeO 2 -t) and fumaric acid (CeO 2 -f) as corrosion inhibitors. Design/methodology/approach The chemical state of CeO 2 -t, and CeO 2 -f were analyzed by infrared radiation (IR) and X-ray diffraction (XRD). The effect of different inhibitors on the coating properties was analyzed by neutral salt spray tests (NSST) and electrochemical impedance spectroscopy (EIS). Findings The results of IR and XRD illustrate that the modification of CeO 2 was successful, and fumaric acid underwent a ring-opening reaction with epoxy resin (EP) in the coatings. The results of NSST and EIS showed that the coatings containing CeO 2 -f exhibited the best anticorrosion performance. Originality/value CeO 2 is an effective inhibitor of the organic coatings. When surface modified, it is chemically bonded to EP, enhancing the anticorrosion performance of EP.