Abstract
With a size effect of the fillers, the two-way corrosion protection mechanism is manifested in the composite coating system containing graphene oxide stabilized polystyrene containers encapsulating 8-hydroxyquinoline (8-HQ@PS/GO) corrosion inhibitor. The active protection is induced by the surface damage, in response to which self-healing is observed in the coating by the release of encapsulated corrosion inhibitor. The release kinetics study of the 8-HQ@PS/GO inhibitor showed a gradual and continuous supply at the damage site. A strong size effect of the 8-HQ@PS/GO on the passive protection and self-healing properties of the composite coating is demonstrated. Compared to neat epoxy coatings, hardness and elastic modulus values in Epoxy-8-HQ@PS/GO composite coatings increased by 35% and 54%, respectively. The compact arrangement of 8-HQ@PS/GO in the composite coating matrix also lowers the surface electrical resistivity by four orders of magnitude compared to the neat epoxy coating, facilitating electrostatic charge dispersal, i.e., a potential coating for the antistatic application.
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