Corrosion Resistance of Self-healing Coating doped with 2-Mercaptobenzimidazoleanions Intercalating Zn-Al Layered Double Hydroxides

The 2-mercaptobenzimidazole (MBI) anions intercalating Zn-Al layered double hydroxidesZn-Al (MBI) LDHswere successfully prepared by the anion-exchange method for the first time.The self-healing property and corrosion resistance of the coating doped with Zn-Al (MBI) LDHs were investigated by electrochemical impedance spectroscopy (EIS) and artificial scratches.The results showed that the benzene ring of MBI adopted a horizontal or declining orientation in the LDHs interlayer.The prepared LDHs actively released the inhibitor and absorbed Cl^-.The sol-gel coating doped with the Zn-Al (MBI) LDHs displayed excellently anticorrosive performance compared to the undoped sol-gel coating,due to the release of corrosion inhibitor from the Zn-Al (MBI) LDHs.