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Öğe A combined experimental and theoretical approach effect of a benzimidazolium salt as a new corrosion inhibitor on mild steel in HCl solution(Springer Heidelberg, 2023) Akkoc, Senem; Ozkir, Demet; Basaran, Eyup; Kaya, Savas; Berisha, AvniIt is a study in which the inhibitor effect of a synthesized benzimidazole derivative organic compound on the corrosion behavior of mild steel in hydrochloric acid solution is examined both experimentally by electrochemical methods and theoretical approaches such as density function theory and simulation studies. Electrochemical experiments were performed with three different methods such as electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR), and potentiodynamic polarization for a short immersion time (1 h). It was observed that the benzimidazole-derived synthesized inhibitor, which was prepared in four different concentrations, inhibited the corrosion of mild steel in 1.0 M HCl solution very highly with the experimental method. In particular, the inhibition efficiency was over 90% at the two highest concentrations (1.0 x 10(-4) M and 5.0 x 10(-4) M). The theoretical quantum mechanical calculations also confirm the surface adsorption tendency of the molecule whose inhibitory property is examined and provide a clearer understanding of the inhibition process from a molecular perspective.Öğe Effect of hyamine on electrochemical behaviour of brass alloy in HNO3 solution(SPRINGER INTERNATIONAL PUBLISHING AG, 2013) Ozkir, Demet; Bayol, Emel; Gurten, A. Ali; Surme, Yavuz; Kandemirli, FatmaThe electrochemical behaviours of a brass alloy in 0.1 M nitric acid, including the hyamine inhibitor with concentrations between 2.5 x 10(-4) M and 1.0 x 10(-5) M, were studied. For this purpose, potentiodynamic polarisation, electrochemical impedance spectroscopy (EIS), linear polarisation resistance (LPR) techniques, and flame atomic absorption spectroscopy (FAAS) were utilised. The inhibitor molecules adsorbed on the brass surface were calculated to be in good agreement with the Langmuir adsorption isotherm and the standard free enthalpy of adsorption (Delta G (ads) (a similar to) ). Hyamine effectively improved the corrosion inhibition of brass and acted as a mixed-type inhibitor on alloy surfaces. The surface morphology of the alloy was also clarified by optical microscopic and SEM techniques. A theoretical study of the corrosion inhibition efficiency of hyamine molecule was carried out using density functional theory (DFT) at the B3LYP/6-311G(d,p) basis set level. (C) 2012 Institute of Chemistry, Slovak Academy of SciencesÖğe Inhibition Efficiency of Benzidine for Mild Steel in Acidic Media(MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011) Ozkir, Demet; Bayol, EmelIn this study, the inhibition effect of different concentrations of benzidine possessing amine groups in its structure on the corrosion behavior of mild steel (MS) in 1.0 M HCl solution at 293 K temperature was practiced in both short and long immersion times by measuring electrochemical impedance spectroscopy (EIS), hydrogen evolution (V(H2)-t) and change of open circuit potential (E(ocp)-t). For short-term tests, potentiodynamic polarization and linear polarization resistance (R(lp)) were also studied. Polarization data indicate that this compound act as mixed-type inhibitor for mild steel in 1.0 M HCl. With regard to the results cited, it was identified that the increase in the inhibitor efficiencies with concentration was emanated from the adsorption of benzidine molecules on the electrode surface. Pertinent to this adsorption, it followed Langmuir isotherm. Adsorption equilibrium constant and adsorption free energy were determined. The effect of temperature on the corrosion behaviour in the absence of any inhibitor and in the presence of 75 mM benzidine was studied in the range of 293 323 K. Activation energies (E(a)*) were calculated from the obtained corrosion rates at different temperatures. Furthermore, in order to identify the adsorption mechanism of the inhibitor on the metal surface, the zero-charge potential (PZC) was determined by EIS measurement technique. Surface morphology of mild steel electrodes were emerged by means of the scanning electron microscope. DOI: 10.1134/S2070205111040150Öğe Insights into the high and prolonged inhibition mechanism of pyridoxine hydrochloride as vitamin B6: a new green inhibitor slowing the acidic corrosion of mild steel(Springer Int Publ Ag, 2024) Ozkir, DemetThis study aimed to assess the green corrosion inhibitor effect of the compound known as vitamin B6 and called pyridoxine hydrochloride (PYB6) on mild steel in 1.0 M HCl solution by some electrochemical techniques such as linear polarization resistance (LPR), potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) for various concentrations and durations. In order to examine the interplay between PYB6 and mild steel surface, various adsorption isotherms were tried and the best correlation constant among them was acquired by Langmuir adsorption isotherm. Experimental data calculated by the EIS method showed that the lowest inhibition efficiency value was 70.7% for 1.0 x 10-5 M PYB6 solution concentration after one hour of immersion, while the highest inhibition efficiency value was 96.8% for 1.0 x 10-3 M PYB6 solution concentration after 48 h of immersion. The finding of zero charge potential (PZC) of mild steel was found to be - 0.010 V in the solution containing the highest concentration of PYB6, which supports that the inhibition mechanism creates a protective film layer on the surface of mild steel with protonated PYB6 molecules. The surface analysis of PYB6 onto mild steel in a hydrochloric acid solution was also examined utilizing techniques such as atomic force microscope (AFM) and field emission scanning electron microscope (FE-SEM). It was concluded that PYB6 green inhibitor formed a presentative adsorption film on the surface of mild steel, effectively reducing its corrosion.Öğe Synthesis and characterization of a new eco-friendly dopamine derivative schiff base as an effective corrosion inhibitor for mild steel in acidic environment(Taylor & Francis Ltd, 2024) Ozkir, Demet; Bay, YaseminThe natural corrosion inhibitor behaviour of a newly synthesized dopamine derivative Schiff base (4-DBAB) has been inspected on mild steel in aggressive 1 M HCl using linear polarization, electrochemical impedance spectroscopy and potentiodynamic polarization techniques. The Schiff base was synthesized by eco-friendly pathway. Characterization of the synthesized new non-toxic inhibitor was performed using FT-IR and 1H-NMR spectroscopy techniques. The anti-corrosive efficiencies at optimum concentration of 4-DBAB inhibitor was 87.4% after 1 h and 98.4% after 120 h by impedance technique in acidic solution. The potential of zero charge of mild steel was also determined to elucidate the inhibition mechanism in the presence of the highest 4-DBAB solution. The atomic force microscopy and field emission scanning electron microscopy researches performed on surface morphology to provide additional support on the interaction between the mild steel surface and 4-DBAB molecules. Adsorption behaviour of the inhibitor was also studied at different durations by experimental inhibition results and showed the Langmuir isotherm involving chemisorption.HighlightsA new dopamine-derived Schiff base (4-DBAB) with natural and environmentally friendly corrosion inhibition properties was synthesized. (Synthesis of eco-friendly compound).4-DBAB demonstrated a high anti-corrosive efficiency after 120 hours in aggressive 1M HCl, as determined by impedance technique. (Exceptional corrosion inhibition).The determination of the potential of zero charge of mild steel provided insights into the inhibition mechanism in the presence of the highest 4-DBAB solution. (Mechanism elucidation).AFM and FE-SEM studies on surface morphology supported the interaction between the mild steel and 4-DBAB molecules, affirming its corrosion inhibition properties. (Surface interaction analysis).Öğe The Electrochemical Variation of a Kind of Protein Staining and Food Dye as a New Corrosion Inhibitor on Mild Steel in Acidic Medium(Hindawi Ltd, 2019) Ozkir, DemetIn this study, the relevance of a food dye, namely, Fast Green-FCF (FG-FCF), was surveyed as a new inhibitor for mild steel in HCl solution. This effect was specified by electrochemical impedance spectroscopy (EIS), one of the most widely used measurement techniques. As a result of the increment of the inhibitor concentration, it was seen that the values of polarization resistance increased and covered the metal surface of FG-FCF like a blanket. Tests endorse that the FG-FCF is chemically adsorbed on mild steel surface, according to the Langmuir isotherm. With surface characteristic analyses, such as field emission scanning electron microscope (FESEM) and atomic force microscope (AFM), it was further determined that the metal surface in HCl of FG-FCF was protected. By applying the hydrogen gas evolution technique, FG-FCF has been proven to provide the lowest surface area with all inhibited solutions from the blank due to its strong adsorption to the metal surface. Finally, it has been clarified that FG-FCF can be practically used as a good corrosion inhibitor for mild steel with the supported results.Öğe The inhibition effect of Azure A on mild steel in 1 M HCl. A complete study: Adsorption, temperature, duration and quantum chemical aspects(PERGAMON-ELSEVIER SCIENCE LTD, 2012) Ozkir, Demet; Kayakirilmaz, Kadriye; Bayol, Emel; Gurten, A. Ali; Kandemirli, FatmaIn this study, inhibition effect of Azure A on mild steel in 1.0 M HCl were evaluated by using electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR), and potentiodynamic polarization and scanning electron microscope (SEM) methods. These studies were carried out at different concentrations, temperatures and durations. The inhibitor molecules were chemisorbed on electrode surface according to the Langmuir adsorption isotherm. The quantum chemical calculations were employed to give further insight into the inhibition mechanism of Azure A. (C) 2011 Elsevier Ltd. All rights reserved.Öğe The Inhibitor Effect of (E)-5-[(4-(benzyl(methyl)amino)phenyl)diazenyl]-1,4-dimethyl-1H-1,2,4-triazol-4-ium zinc(II) Chloride, an Industrial Cationic Azo Dye, onto Reducing Acidic Corrosion Rate of Mild Steel(Korean Electrochemistry Soc, 2020) Ozkir, Demet; Kayakirilmaz, KadriyeThis study covers the stages of testing whether the azo dye with chemical name (E)-5-[(4-(benzyl(methy)amino)phenyl)diazenyl]-1,4-dimethyl-1H-1,2,4-triazol-4-ium zinc (II) chloride (DMT), known as Maxilon Red GRL in the dye industry, can be used as an anticorrosive feasible inhibitory agent, especially in industrial areas other than carpet, yarn and fibre dyeing. These test stages consist of the electrochemical measurement techniques such as potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) for diverse concentrations and durations. The adsorption of the viewed DMT molecule on the mild steel surface obeyed the Langmuir isotherm. The zero charge potential (PZC) of mild steel was also found to assess the inhibition mechanism in containing DMT solution. The inhibition performance of DMT on the mild steel in a 1.0 M HCl solution was also investigated using methods such as metal microscope, atomic force microscope (AFM) and field emission scanning electron microscope (FE-SEM).Öğe THERMODYNAMIC STUDY AND ELECTROCHEMICAL INVESTIGATION OF CALCEIN AS CORROSION INHIBITOR FOR MILD STEEL IN HYDROCHLORIC ACID SOLUTION(SOC CHILENA QUIMICA, 2013) Ozkir, Demet; Bayol, Emel; Gurten, A. Ali; Surme, YavuzThe corrosion behaviour of mild steel in 1.0 M HCl solution containing different concentrations of Calcein at different temperatures was investigated using the impedance, potentiodynamic polarization and linear polarization techniques. Long term tests were accomplished by hydrogen gas evolution and impedance measurements. The results showed that inhibition efficiency has increased with the inhibitor concentration and temperature increment. The adsorption of the inhibitor on the mild steel surface obeyed the Langmuir isotherm. Activation energy values at concentrations of Calcein were lower than that of uninhibited system. The thermodynamic parameters of adsorption deduced reveal a strong interaction of Calcein on the mild steel surface.Öğe Thermodynamic study and electrochemical Investigation of calcein as corrosion Inhibitor for mild steel in hydrochloric acid Solution(Sociedad Chilena de Quimica, 2013) Ozkir, Demet; Bayol, Emel; Ali Gürten, A.; Sürme, YavuzThe corrosion behaviour of mild steel in 1.0 M HCl solution containing different concentrations of Calcein at different temperatures was investigated using the impedance, potentiodynamic polarization and linear polarization techniques. Long term tests were accomplished by hydrogen gas evolution and impedance measurements. The results showed that inhibition efficiency has increased with the inhibitor concentration and temperature increment. The adsorption of the inhibitor on the mild steel surface obeyed the Langmuir isotherm. Activation energy values at concentrations of Calcein were lower than that of uninhibited system. The thermodynamic parameters of adsorption deduced reveal a strong interaction of Calcein on the mild steel surface.
