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The present work deals with the production of nanocapsules containing a natural corrosion inhibition component.  Azadirachta indica was  encapsulated in urea-formaldehyde polymeric shell using ultrasound-assisted and conventional approaches of in situ polymerization. Subsequently nanocapsules were incorporated into clear epoxy polyamide to develop the green self-healing corrosion inhibition coating. The actual performance of the coating was evaluated based on the studies involving the repair of the crack of high solid surface coating. Corrosion inhibition of the healed area has been evaluated using the electrochemical impedance spectroscopy and immersion test based on the use of standard epoxy coating. The obtained results confirmed better corrosion protection in terms of the electrochemical impendence spectroscopy data and Tafel plot. It was found that current density decreases from 0.0011 A/cm 2  (for standard epoxy coating) to 5.22 E −7  A/cm 2  as 4 wt% nanocapsules incorporated in coating.

Green synthesis of nanocapsules for self-healing anticorrosion coating using ultrasound-assisted approach