Mohamed Znini

A novel heterocyclic compound, 6-(tert-butyl)-4-phenyl-3,4-dihydropyrimidine-2(1H)-thione (TPDP), was synthesized via two distinct methods: a cyclocondensation reaction of (E)-4,4-dimethyl-1-phenylpent-1-en-3-one and a one-pot reaction involving thiourea, benzaldehyde, and pinacolone. The compound's structure was elucidated using standard spectroscopic techniques, including 1H NMR, 13C NMR, IR, and mass spectrometry. Given that organic compounds containing heteroatoms (N, S, O) are known to be effective corrosion inhibitors, this study evaluated TPDP's potential to inhibit corrosion of carbon steel (CS) in 1 M hydrochloric acid solution. Electrochemical measurements, including polarization curves and electrochemical impedance spectroscopy, coupled with theoretical studies, revealed that TPDP's inhibition efficiency increases with concentration, reaching 94% at 10−3 M. TPDP acts as a mixed-type inhibitor, forming a protective film on the metal surface. The Gibbs free energy of adsorption (−33.73 kJ/mol) indicates a physicochemical adsorption mechanism, consistent with the Langmuir adsorption isotherm. TPDP remains effective at elevated temperatures. Scanning electron microscopy (SEM), density functional theory (DFT), and Monte Carlo (MC) simulations further corroborate TPDP's robust inhibitory performance.

A novel O -allylated fluorescein hydrazone derivative was synthesized from fluorescein through a three-step synthetic route.

In this work, the essential oil of cumin from Morocco Drâa-Tafilalet have been used as corrosion inhibitor of carbon steel in 1M HCl. The essential oil of cumin is obtained by hydrodistillation technique, this extract has been identified by the method of gas chromatography coupled to the mass (GPC/Mass). The electrochemical study was carried out by potentiodynamic curves and impedance spectroscopy diagrams, completed by SEM/EDX surface analysis. The obtained result showed that the Cuminum cyminum L. can be used as an efficient inhibitor of carbon steel in acidic medium. This oil has proven to be an environmentally friendly, biodegradable and inexpensive corrosion inhibitor with a high potential for industrial application.

The objective of this research work is the study of the inhibitory effect of Warionia saharea essential oil (WSEO) on the corrosion of mild steel (MS) in molar HCl solution, employing both experimental and theoretical methods. This inhibitory effect (IE) has been evaluated by using a combination of weight loss measurements (LW) and various electrochemical methods, such as open circuit potential (OCP), potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) experiments. The LW results indicated that IE increased with inhibitor concentration, reaching 83.34% at 3.00 g/L. The PDP analysis suggested that WSEO functions as a mixed inhibitor, while in the EIS results the R_ct values increased with inhibitor concentration to reach 165.8 Ω cm² at 2.00 g/L, suggesting a defensive film formation by WSEO molecules over the metallic surface. The thermodynamic study demonstrated that the WSEO molecules adsorption on the MS surface followed a Langmuir isotherm, involving mixed physical and chemical (physicochemical) adsorption on the MS surface. Theoretical methods, including density functional theory (DFT) and molecular dynamics (MD) simulations, were employed to elucidate the inhibition mechanisms of the three main components of WSEO. The quantum chemical analysis, using density functional theory (DFT) and molecular dynamics (MD) simulations, showed a low ΔE_gap value of 6.30 eV and a low adsorption energy (E_ads) value on an Fe (110) substrate of −258 Kcal/mol for (E)-Nerolidol, indicating the significant contribution of this molecule to the overall corrosion inhibition effect of WSEO. The scanning electron microscope (SEM) analysis verified the presence of a protective film formed by the inhibitor on the MS surface. This study highlights the potential of WSEO as a sustainable and green corrosion inhibitor in acidic environments.