ANTICORROSION PERFORMANCE OF SELF-HEALING POLYMERIC COATING ON LOW CARBON STEEL SUBSTRATES IN 3.5 wt.% NaCl MEDIUM
In this study, Poly-Urea-Formaldehyde (PUF) capsules containing linseed oil were prepared using in- situ polymerisation and 10 wt.% synthesised microcapsules were mixed into a commercialised epoxy paint. The linseed oil encapsulated poly-urea-formaldehyde (PUF) microcapsules had ∼85 wt.% core content with ∼200 µm diameter. Mass loss and corrosion rate measurements were used to investigate the impact of embedded microcapsules on the anticorrosive property of the self-healing coating. The complete self-healing coating had the excellent anticorrosive properties compared to epoxy coating without microcapsules. For defects such as micro cracks and porosity, the scratched self- healing coating demonstrated excellent healing ability as well as corrosion inhibition. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to investigate the failure of the scratched self-healing coating. The overall results and tests revealed that the self-healing coating has sufficient corrosion resistance when compared to the coating without microcapsules.