pH and photothermal dual responsive long-term self-healing anti-corrosion coating based on MoS2 modified halloysite nanotube

The research on intelligent corrosion inhibition and repair protective coatings is currently underway, with a particular focus on the intricate microstructure failure process of these coatings due to the inherent complexity of their fillers (functionality, interfacial compatibility, etc.). Herein, we developed corrosion inhibition nanocontainers with enhanced photothermal and pH-responsive properties. The incorporation of chitosan facilitated the acidic environment responsiveness of the nanocontainers, while MoS 2 nanocontainers enabled light-triggered release. The electrochemical results show that after 60 days, the impedance modulus of epoxy coating with 1 % nanocontainers is 4.35 × 10 8  Ω·cm 2 , while that of pure epoxy coating is 2.09 × 10 6  Ω·cm 2 . And it can achieve 300 h of salt spray resistance. In addition, the mechanical properties show that the adhesion and tensile properties of the coating are improved, and the saturated water absorption of the coating is decreased. In addition, the evolution of its electrochemical structure was comprehensively studied using relaxation time analysis. The research results indicate that the coating exhibits multiple electrochemical processes, and the controlled release and formation of a protective layer effectively hinder the formation of corrosion products and reduce internal electrochemical reactions. This study provides a potential method for studying the structural evolution of composite coatings.