Research Progress on Improving the Durability of Anti - Corrosive Coatings Based on Micro - Nano Capsule Fillers

The integrity and durability of metal coatings have a great influence on the medium corrosion resistance of steel structures. When the anti-corrosive coating was partially damaged or microcracked, the micro-nano capsule filler could produce a stress response to the changes in the micro-environment under the coating, release corrosion-inhibiting substances or polymer monomers, and realize the self-healing of the coating, filling the voids, and thereby significantly improving the medium corrosion resistance of coating. In this work, the principle of micro-nano self-healing coating was introduced firstly. Taking several new micro-nano fillers such as mesoporous SiO2, layered double hydroxide, halloysite nanotubes and metal organic framework compounds as representatives, their application, advantages and disadvantages in self-healing high corrosion resistant coatings were summarized and forecasted briefly, which could provide several ideas for the development of high corrosion resistant and long-lasting coatings.