Boosting the Corrosion Inhibition of Q235 Steel by Incorporating Multi-responsive Montmorillonite-based Composite Inhibitor into Epoxy Coating

Montmorillonite (MMT), a natural silicate mineral with layered structure, can be used as a nanocontainer for loading 8-hydroxyquinoline (8HQ) corrosion inhibitor. The obtained 8-HQ intercalated MMT (8HQ-MMT) by ion exchange was confirmed by various techniques. The release test shows that the prepared 8HQ-MMT is an acid -/alkali -/salt-multi-responsive composite corrosion inhibitor. In addition, the corrosion inhibi-tion efficiency of Q235 steel in 3.5%NaCl + 1.0 g/L 8HQ-MMT solution released at 48 h can reach 56.16%. The epoxy coating mixed with 2 wt % 8HQ-MMT composite corrosion inhibitor can significantly improve the corrosion resistance of coating, and especially for endowing self-healing ability to a certain extent.