Polymeric smart coatings containing modified capped halloysite nanotubes for corrosion protection of carbon steel

Abstract A newly designed smart self-healing epoxy coating system comprised of modified halloysite nanotubes (HNTs) having capping is proposed for corrosion protection steel. In the first step, HNTs were loaded with 8-hydroxyquinoline (8HQ), used as a inhibitor. Then sealed/capped using cobalt (II), aiming an efficient and controlled release The coatings developed by reinforcing into matrix. structural, thermal, mechanical, electrochemical properties capped studied various techniques. UV–Vis analysis depicted that metal-inhibitor complex was decomposed at acidic pH resulting in inhibitor HNTs. Electrochemical impedance spectroscopic (EIS) blank demonstrated low-frequency modulus 10 9 Ω.cm 2 20 days compared to (10 5 ), reflecting their excellent inhibition performance. superior these can be ascribed from Finally, X-ray photoelectron spectroscopy (XPS) steel substrate after revealed adsorption 8HQ on surface, confirming formation iron due This work adeptness mitigating effective because dissociation (Co-8HQ). Graphical abstract