Corrosion Inhibition Evaluation of Chitosan–CuO Nanocomposite for Carbon Steel in 5% HCl Solution and Effect of KI Addition

Chitosan–copper oxide (CHT–CuO) nanocomposite was made by an in-situ method utilizing olive leaf extract (OLE) as reductant. The OLE mediated CHT–CuO containing varying amount of chitosan (0.5, 1.0 and 2.0 g) evaluated corrosion inhibitor for X60 carbon steel in 5 wt% hydrochloric acid solution. inhibitive performance assessed weight loss electrochemical impedance spectroscopy, linear polarization resistance potentiodynamic techniques complemented with surface assessment the corroded without additives using scanning electron microscopy/energy dispersive X-ray spectroscopy 3D optical profilometer. effect KI addition on protection capacity nanocomposites also examined. Corrosion observed to increase dosage highest inhibition efficiency (IE) achieved at optimum 0.5%. order followed trend CHT1.0–CuO (90.35%) > CHT0.5–CuO (90.16%) CHT2.0–CuO (89.52%) from measurements. Also, IE found temperature raised 25 40 °C afterwards a decline further 50 60 °C. results suggest that alone combination inhibited active site blocking mechanism. Addition upgrades but is not attributable synergistic influence. lack influence confirmed computed synergism parameter (S1) which be less than unity values 0.89, 0.74 0.75 CHT0.5–CuO, nanocomposites, respectively, Furthermore, improved rise Surface analysis confirm formation protective film could attributed adsorption surface.