Yazar "Hafez, Baraa" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Acetylsalicylic acid as an environmentally friendly corrosion inhibitor for carbon steel XC48 in chloride environment
    (Elsevier, 2023) Merimi, Chaimae; Hammouti, Belkheir; Zaidi, Kaoutar; Hafez, Baraa; Elmsellem, Hicham; Touzani, Rachid; Kaya, Savas
    In this study we evaluated the corrosion inhibition potential of an environmentally friendly, cost effective and beneficial compound on carbon steel in an acidic environment.We investigated electrochemical as well as gravimetric measurements for corrosion performance in-hibition of the acetylsalicylic acid ASA molecules used from carbon steel XC48 in HCl 1M solution. The results show that aspirin inhibits the corrosion of carbon steel in acidic environment. It was found that the inhibition efficiency of aspirin increased with increasing inhibitor concentration and decreased with increasing temperature. The maximum inhibition efficiency was 96% with 5 x10 -3 M aspirin at 308 K. The inhibition efficiency increased with increasing concentration of ASA. This inhibitor adsorbs on the metal surface according to the Langmuir model and a physical adsorption mechanism is proposed for the adsorption of the inhibitor on the carbon steel surface, the scanning electron microscopy (SEM), the Thermodynamic and the kinetic parameters were calculated and discussed.(c) 2022 Elsevier B.V. All rights reserved.
  • Küçük Resim Yok
    Öğe
    Anti-corrosion performance of 8-hydroxyquinoline derivatives for mild steel in acidicmedium: Gravimetric, electrochemical, DFT andmolecular dynamics simulation investigations
    (Elsevier, 2020) Douche, Dhaybia; Elmsellem, Hicham; Anouar, El Hassane; Guo, Lei; Hafez, Baraa; Tuzun, Burak; El Louzi, Ahmed
    The anti-corrosion potency of three synthesized 8-hydroxyquinoline derivatives, namely 5-(azidomethyl)-7-(morpholinomethyl)quinolin-8-ol (HM1), 2-(8-hydroxy-7-(morpholinomethyl)quinolin-5-yl)acetonitrile (HM2), 5-(azidomethyl)-7-(piperidin-1-ylmethyl)quinolin-8-ol (HM3) in hydrochloric acid for mild steel was investigated using weight loss and electrochemical techniques. Potentiodynamic polarization (PDP) data reveal that all three compounds were cathodic inhibitors, with HM3 presentation significant mixed-type effect at high inhibitor concentrations (10(-3) M). Electrochemical impedance spectroscopy (EIS) data reveal better adsorption of compounds species on MS surface at increased inhibitor concentrations with HM1, HM2 and HM3 reaching a maximum efficiency of 90, 89 and 88%. The three compounds HM1, HM2 and HM3 were inclined towards the Langmuir adsorption-isotherm by spontaneous chemical-physical adsorptions of inhibitors on the mild steel surface. The correlation between the electronic properties and inhibition efficacies of the tilted inhibitors was determined by using simple linear regression technique. Electronic properties were calculated for neutral and protonated forms in a polarizable continuum model using the DFT method at the B3LYP/6-311 + G (d, p) level of theory. The active adsorbed sites of HM1-HM3 on the metal surface were determined by analyzing their corresponding electrostatic surface potentials (ESP). Furthermore, molecular dynamics simulations have been performed to illustrate the most conceivable adsorption configuration between the inhibitors and metal surface. (C) 2020 Published by Elsevier B.V.