Abstract

Two newly 8-hydroxyquinoline analogs namely N-((8-hydroxyquinolin-5-yl)methyl)-4-methylpiperazine-1-carbothioamide (HQMC) and N-((8-hydroxyquinolin-5-yl)methyl)-4-phenylpiperazine-1-carbothioamide (HQPC) were synthesized and identified by elemental analysis, ¹H NMR and ¹³C NMR spectroscopy. HQMC and HQPC were examined as the C22E steel corrosion inhibitors in 1 M HCl (hydrochloric acid) solution by weight loss and electrochemical measurements. Tafel polarization measurements manifest that HQMC is a mixed type inhibitor with predominant anodic effectiveness, while the HQPC is anodic type corrosion inhibitor. The adsorption of these two organic inhibitors on C22E steel complies with the isotherm of Langmuir. All results demonstrated that HQMC and HQPC behave as good C22E steel corrosion inhibitors in 1 M HCl and their performance follows the order, HQMC (91.73%) > HQPC (87.09%) at 10⁻³ M. The solutions of inhibitors were analyzed by a UV–visible spectrophotometer. Correlation between molecular structures and inhibitory activity was performed utilizing the density functional theory (DFT) method. The molecular dynamics (MD) simulations results are in good accord with the appointed inhibition efficiencies of the experimentally.

Title

Ismail Warad

Publisher

Ismail Warad

Publisher Country

Palestine

Publication Type

Prtinted only

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