Microencapsulation of corrosion inhibitors and active additives for anticorrosive protective polymer coatings

One of the most promising methods to improve the protective ability of coatings is the use of microencapsulated corrosion inhibitors (MCI) and active additives in their composition. Microencapsulation technology greatly simplifies the process of compounding the polymer protective coating and allows to isolate the active components from the reactive groups of polymer resins and hardener at the stage of curing, correctly form the polymer base of the coating and avoid the negative effect of the inhibitor on the adhesion of the coating to the protected substrate. The review discusses the main methods and techniques for producing micro-and nanocapsules. The basic requirements for the quality and complex characteristics of micro- and nanocapsulated corrosion inhibitors are presented. The advantages and disadvantages of capsules using solid materials, such as powders of natural and synthetic origin, carbon nanotubes, nanotubes based on clay materials and capsules with a liquid core and a polymer shell, for example, epoxy, epoxy, silicone resins, are noted. Description of the mechanism of transfer of the contents of microcapsules in the polymer base of the coating. The possibilities of "intelligent" microcapsules releasing the inhibitor when the pH level changes are considered. Examples of successful scientific and technical solutions for the manufacture and implementation of micro-and nanocapsulated corrosion inhibitors in coatings with specific materials used for the manufacture of microencapsulated corrosion inhibitors are given.