Dual strategy of improved crosslinking degree and incorporated inhibitory fillers for high corrosion resistance sol-gel coatings

In this work, high corrosion resistance sol-gel coatings were prepared by the dual strategy of improved crosslinking degree and incorporated inhibitory fillers. Firstly, a special attention was paid to the mechanism of 2MI improving the crosslinking degree of coatings. Furthermore, the inhibitory fillers 8HQ@Ce-MOF were incorporated to endow coatings with active corrosion protection. Results showed that the 1.3 μm thick coating incorporated with 2MI and 8HQ@Ce-MOF appeared no corrosion pits after neutral salt spray exposure for 21 days, which was ascribed to 2MI improving the crosslinking degree, corrosion inhibition of guest molecule 8HQ, and corrosion suppression of host nanocontainer Ce-MOF.