Synthesis, Characterization and Smart-Release Organic Inhibitor for Anticorrosion Coating

Abstract

Corrosion inhibitor-inorganic clay composite including 2-mercaptobenzimidazole (MBI) anions intercalating Zn-Al layered double hydroxides (LDHs) assembled via anion-exchange reaction. Powder X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectrum analysing and scanning electron microscopy (SEM) indicate that the MBI anion are successfully intercalated into the LDHs interlayer. The benzene plane is horizontal arrangement rather than vertical orientation in the interlayer spacing. The active anticorrosive property of AA2024 alloy with the active anticorrosion coating is evaluated by electrochemical impedance spectroscopy (EIS). The sol-gel coating doped with the LDHs clearly demonstrates long-term anticorrosive performances compared to the undoped sol-gel coating, due to the release of corrosion inhibitor from the LDHs.