Nanoferrite dispersed waterborne epoxy-acrylate: Anticorrosive nanocomposite coatings

Waterborne epoxy acrylate-butylated melamine formaldehyde (EpAc-BMF) coatings and ferrite (Fe3O4) dispersed nanocomposite (EpAc-BMF-Fe3O4) coatings have been developed with a view to effectively replace the hazardous solvent borne polymeric coatings. The physico-mechanical properties of these coatings were studied using standard protocols. Electrochemical measurements were made in 3.5 wt% solutions of NaOH, NaCl and HCl as well as in tap water (Cl− ion 63 mg/L; Conductivity 0.953 mS/m). The salt spray test on coated and uncoated MS was carried out in 5 wt% NaCl solution for 600 h. Fe3O4 nanoparticles in matrix act as filler, which fill the pinhole, interstitial crosslinked spaces and other coating artifacts (micro cracks and voids) regions besides provide strength to the coating material. Electrochemical studies revealed that EpAc-BMF-Fe3O4 coatings were found to be effective in restricting the penetration of aggressive ions by forming a strong barrier layer at coating metal interface. Among various compositions of EpAc-BMF-Fe3O4 coatings, EpAc-BMF-Fe3O4-2.5 coatings have shown highest corrosion protection efficiency in different corrosive media.

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