自修复防腐涂层研究进展

Self-healing anti-corrosion coatings can be automatically restored or restore its original anticorrosive effect under certain conditions after being damaged by external forces or environmental damage. It is an emerging intelligent protective material. This paper summarizes the research progress of self-healing anti-corrosion coatings, classifies the existing self-healing anti-corrosion coating systems into two kinds, assesses the advantages and disadvantages of these two methods and proposes an emerging shape memory self-healing coating at the same time. One method is by embedding the film-forming material or corrosion inhibitor in the coating to achieve the autonomous repair of the coating's anti-corrosion property. The other is the non-autonomous mechanism that uses temperature, light or other external stimulus to achieve the repair of coating defects. Emerging shape memory self-healing coatings, with the ability to repair larger defects, combining with autonomous self-healing repair mechanisms such as adding corrosion inhibitors, can realize the double repair of damaged coatings, providing longer-lasting and stable protection for metal substrates. Most of the existing self-healing coatings are based on a single repair mechanism to repair coating defects, self-healing anti-corrosion coatings also need more detailed and specific studies on multiple repairs. The combination of the autonomous and non-autonomous healing mechanisms to achieve long-term repair performance over the anti-corrosion and functional properties of the coating, will be the direction of development of the next-generation self-healing coatings for corrosion protection.