2025/08/25 by Raid, M., Belhadj, O., El Harmouchi, H. +6
paper · doi:10.48317/imist.prsm/morjchem-v13i4.57342
This article investigates the efficacy of an organic compound derived from calix[4]arene, namely O,O'-(3²,7²-dihydroxy-1,3,5,7(1,3)-tetrabenzenacyclooctaphane-1²,5²-diyl) O,O,O',O'-tetraethyl bis(phosphorothioate) (Calix-L1), as a corrosion inhibitor for extra-mild steel (EMS) in a hydrochloric acid (HCl 1M) environment. Various experimental techniques were employed, including weight loss (WL) measurements to evaluate corrosion reduction, as well as electrochemical methods such as EIS and PDP electrochemical techniques. The results indicate that the inhibition efficiency of Calix-L1 increases with its concentration. Electrochemical PDP analyses reveal that Calix-L1 acts as a mixed-type corrosion inhibitor, achieving an inhibition efficiency of 80.6%. Calix-L1 adsorption on the steel surface adheres to the Langmuir isotherm model. Surface examination performed through scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDS) reveal the development of a protective film on the steel substrate. Moreover, computational studies employing Monte Carlo simulations align with the experimental results, validating the adsorption characteristics of Calix-L1 on the steel surface and highlighting its promise as an efficient corrosion inhibitor.