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Mumtaz A. Quraishi - One of the best experts on this subject based on the ideXlab platform.
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electrochemical behavior of steel acid interface Adsorption and inhibition effect of oligomeric aniline
RSC Advances, 2013Co-Authors: Dileep Kumar Yadav, Ishtiaque Ahamad, Dheeraj Singh Chauhan, Mumtaz A. QuraishiAbstract:The present work shows the development of new protective oligomeric aniline (O-ANI) and its effect on electrochemical corrosion behavior of low carbon steel (LCS) in 1 M HCl at 308 K. The synthesized O-ANI was subjected to spectroscopic and electrochemical characterizations. The inhibition of LCS corrosion by O-ANI was studied using open circuit potential (OCP), potentiodynamic polarization (PDP), linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) measurements. The potentiodynamic polarization data indicated that O-ANI suppresses predominantly the cathodic process of corrosion reaction in comparison to the anodic process. The inhibition efficiency of the O-ANI depends on the length of the oligomeric chain and position of the functional groups. The spectra of all elements, within limits, on the steel surface was determined by energy-dispersive X-ray spectroscopy (EDX). Morphological changes on the electrode surface were monitored by scanning electron microscopy (SEM). The thermodynamic parameters such as the Adsorption Equilibrium Constant (Kads) and the free energy of Adsorption (ΔG°ads) were calculated and discussed. Several Adsorption isotherms were tested and the experimental data fitted well with the Langmuir Adsorption isotherm. UV-visible spectral analysis of O-ANI solution containing LCS indicates the formation of Fe–N (ligand–metal) charge-transfer complex type interaction.
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inhibition of mild steel corrosion in acid solution by pheniramine drug experimental and theoretical study
Corrosion Science, 2010Co-Authors: Ishtiaque Ahamad, Rajendra Prasad, Mumtaz A. QuraishiAbstract:Inhibition of mild steel corrosion in 1 M HCl solution by Pheniramine drug was studied using weight loss, electrochemical impedance spectroscopy, linear polarization resistance, and potentiodynamic polarization measurements. The values of activation energy (Ea) and different thermodynamic parameters such as Adsorption Equilibrium Constant (Kads), free energy of Adsorption (ΔGads°), Adsorption enthalpy (ΔHads°) and Adsorption entropy (ΔSads°) were calculated and discussed. The Adsorption process of studied drug on mild steel surface obeys the Langmuir Adsorption isotherm. Potentiodynamic polarization measurements showed that Pheniramine is mixed-type inhibitor. Further, theoretical calculations were carried out and relations between computed parameters and experimental inhibition efficiency were discussed.
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inhibition of mild steel corrosion in acid solution by pheniramine drug experimental and theoretical study
Corrosion Science, 2010Co-Authors: Ishtiaque Ahamad, Rajendra Prasad, Mumtaz A. QuraishiAbstract:Inhibition of mild steel corrosion in 1 M HCl solution by Pheniramine drug was studied using weight loss, electrochemical impedance spectroscopy, linear polarization resistance, and potentiodynamic polarization measurements. The values of activation energy (Ea) and different thermodynamic parameters such as Adsorption Equilibrium Constant (Kads), free energy of Adsorption (ΔGads°), Adsorption enthalpy (ΔHads°) and Adsorption entropy (ΔSads°) were calculated and discussed. The Adsorption process of studied drug on mild steel surface obeys the Langmuir Adsorption isotherm. Potentiodynamic polarization measurements showed that Pheniramine is mixed-type inhibitor. Further, theoretical calculations were carried out and relations between computed parameters and experimental inhibition efficiency were discussed.
Qibo Zhang - One of the best experts on this subject based on the ideXlab platform.
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corrosion inhibition of aluminum in hydrochloric acid solution by alkylimidazolium ionic liquids
Materials Chemistry and Physics, 2010Co-Authors: Qibo ZhangAbstract:Abstract The effects of newly synthesized three alkylimidazolium ionic liquids—1-butyl-3-methylimidazolium chlorides (BMIC), 1-hexyl-3-methylimidazolium chlorides (HMIC) and 1-octyl-3-methylimidazolium chlorides (OMIC)—on the corrosion of aluminum in 1.0 M HCl were investigated using potentiodynamic polarization, electrochemical impedance spectroscopy and weight loss methods. All measurements showed that the inhibition efficiency increased with increase in the concentration of inhibitor and the effectiveness of these inhibitors was in the order of OMIC > HMIC > BMIC. Polarization curves revealed that the studied inhibitors were mixed type inhibitors. The Adsorption of the inhibitors on the aluminum surface obeyed Langmuir Adsorption isotherm and had a physical mechanism. The effect of temperature on the corrosion behavior in the presence of 5 × 10 −3 M of inhibitors was studied in the temperature range of 303–333 K. The associated activation energy of corrosion and other thermodynamic parameters such as enthalpy of activation (Δ H ), entropy of activation (Δ S ), Adsorption Equilibrium Constant ( K ads ) and free energy of Adsorption (Δ G ads ) were calculated to elaborate the mechanism of corrosion inhibition.
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corrosion inhibition of mild steel by alkylimidazolium ionic liquids in hydrochloric acid
Electrochimica Acta, 2009Co-Authors: Qibo Zhang, Yixin HuaAbstract:Abstract The acid corrosion inhibition process of mild steel in 1 M HCl by 1-butyl-3-methylimidazolium chlorides (BMIC) and 1-butyl-3-methylimidazolium hydrogen sulfate ([BMIM]HSO4) has been investigated using electrochemical impedance, potentiodynamic polarization and weight loss measurements. Potentiodynamic polarization studies indicate the studied inhibitors are mixed type inhibitors. For both inhibitors, the inhibition efficiency increased with increase in the concentration of the inhibitor and the effectiveness of the two inhibitors are in the order [BMIM]HSO4 > BMIC. The Adsorption of the inhibitors on mild steel surface obeyed the Langmuir's Adsorption isotherm. The effect of temperature on the corrosion behavior in the presence of 5 × 10−3 M of inhibitors was studied in the temperature range of 303–333 K. The associated activation energy of corrosion and other thermodynamic parameters such as enthalpy of activation (ΔH), entropy of activation (ΔS), Adsorption Equilibrium Constant (Kads) and standard free energy of Adsorption (ΔGads) were calculated to elaborate the mechanism of corrosion inhibition.
M Erbil - One of the best experts on this subject based on the ideXlab platform.
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investigation of Adsorption and inhibitive effect of 2 mercaptothiazoline on corrosion of mild steel in hydrochloric acid media
Electrochimica Acta, 2008Co-Authors: Ramazan Solmaz, Gulfeza Kardas, Birgul Yazici, Mustafa Culha, M ErbilAbstract:Abstract The inhibition effect of 2-mercaptothiazoline (2MT) on the corrosion behavior of mild steel (MS) in 0.5 M HCl solution was studied in both short and long immersion times (120 h) using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) techniques. For long-term tests, hydrogen gas evolution ( V H 2 − t ) and the change of the open circuit potential with immersion time (Eocp − t) were also measured in addition to the former three techniques. The surface morphology of the MS after its exposure to 0.5 M HCl solution with and without 1.0 × 10−2 M 2MT with the different immersion times was examined by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The thermal stability of the inhibitor film was investigated by thermogravimetric analysis (TGA). The value of activation energy (Ea) for the MS corrosion and the thermodynamic parameters such as Adsorption Equilibrium Constant (Kads), free energy of Adsorption (ΔGads), Adsorption heat (ΔHads) and Adsorption entropy (ΔSads) values were calculated and discussed. The potential of zero charge (PZC) of the MS in inhibited solution was studied by the EIS method, and a mechanism for the Adsorption process was proposed. The results showed that 2MT performed excellent inhibiting effect for the corrosion of the MS. Finally, the high inhibition efficiency was discussed in terms of Adsorption of inhibitor molecules and protective film formation on the metal surface. TGA results also indicated that the inhibitor film on the surface had a relatively good thermal stability.
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Adsorption and corrosion inhibition effect of 1 1 thiocarbonyldiimidazole on mild steel in h2so4 solution and synergistic effect of iodide ion
Acta Physico-chimica Sinica, 2008Co-Authors: Ramazan Solmaz, Gulfeza Kardas, Mehmet Erman Mert, Birgul Yazici, M ErbilAbstract:Abstract The inhibition effect of 1,1′-thiocarbonyldiimidazole (TCDI) on the corrosion behaviors of mild steel (MS) in 0.5 mol·L−1 H2SO4 solution was studied with the help of potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and linear polarization resistance (LPR) techniques. The effect of immersion time on the inhibition effect of TCDI was also investigated over 72 h. For the long-term tests, hydrogen evolution with immersion time (VH2–t) was measured in addition to the three techniques already mentioned. The thermodynamic parameters, such as Adsorption Equilibrium Constant (Kads) and Adsorption free energy (ΔGads) values, were calculated and discussed. To clarify inhibition mechanism, the synergistic effect of iodide ion was also investigated. The potential of zero charge (PZC) of the MS was studied by electrochemical impedance spectroscopy method, and a mechanism of Adsorption process was proposed. It was demonstrated that inhibition efficiency increased with the increase in TCDI concentration and synergistically increased in the presence of KI. The inhibition efficiency was discussed in terms of Adsorption of inhibitor molecules on the metal surface and protective film formation.
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Adsorption and corrosion inhibitive properties of 2 amino 5 mercapto 1 3 4 thiadiazole on mild steel in hydrochloric acid media
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2008Co-Authors: Ramazan Solmaz, Gulfeza Kardas, Birgul Yazici, M ErbilAbstract:Abstract In this study, Adsorption of 2-amino-5-mercapto-1,3,4-thiadiazole (2A5MT) on mild steel (MS) surface in 0.5 M HCl solution and its corrosion inhibition effect was studied in both short and long immersion times (over 120 h). For this purpose, a series of techniques, such as potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR), thermogravimetric analysis (TGA), surface photographs, hydrogen evolution ( V H 2 – t ) and change of open circuit potential with immersion time ( E ocp – t ) were utilized. The values of activation energy for MS corrosion and the thermodynamic parameters, such as Adsorption Equilibrium Constant ( K ads ), free energy of Adsorption (Δ G ads ), Adsorption heat (Δ H ads ) and Adsorption entropy (Δ S ads ) values were calculated and discussed. The potential of zero charge ( E pzc ) of MS in inhibited solution was studied both after short and long immersion times by EIS method, and a mechanism of Adsorption process was proposed. Results showed that 2A5MT performed excellent inhibiting effect for the corrosion of MS in 0.5 HCl solution and inhibition efficiency is higher than 99% after 120 h at 1.0 × 10 −2 M. The high inhibition efficiency was discussed in terms of strongly Adsorption of inhibitor molecules on the metal surface and forming a protective film. Surface photographs showed a good surface coverage on the metal surface. TGA results indicated that the surface inhibitor film has relatively good thermal stability.
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the rhodanine inhibition effect on the corrosion of a mild steel in acid along the exposure time
Protection of Metals, 2007Co-Authors: Ramazan Solmaz, Gulfeza Kardas, Birgul Yazici, M ErbilAbstract:The corrosion performance of a mild steel (MS) exposed to a 0.5 M HCl solution with various concentrations of Rhodanine (Rh) was studied by means of anodic and cathodic voltammetric curves, electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) techniques. Rh makes the corrosion of MS in HCl solution decelerate with the exposure time so as to reach a protective value of more than 99% in 168 h. The Adsorption of Rh molecules on the MS obeys Langmiur Adsorption isotherm. Thermodynamic parameters, Adsorption Equilibrium Constant (Kads), and standard free energy of Adsorption (ΔGadso) were calculated and discussed. The high inhibition efficiency was discussed in terms of blockading the metal surface by the Rh molecules strongly adsorbing witch their active centers and thus forming a sufficiently effective protective film.
Dong Hwang Chen - One of the best experts on this subject based on the ideXlab platform.
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preparation and Adsorption properties of monodisperse chitosan bound fe3o4 magnetic nanoparticles for removal of cu ii ions
Journal of Colloid and Interface Science, 2005Co-Authors: Yangchuang Chang, Dong Hwang ChenAbstract:Abstract Monodisperse chitosan-bound Fe3O4 nanoparticles were developed as a novel magnetic nano-adsorbent for the removal of heavy metal ions. Chitosan was first carboxymethylated and then covalently bound on the surface of Fe3O4 nanoparticles via carbodiimide activation. Transmission electron microscopy micrographs showed that the chitosan-bound Fe3O4 nanoparticles were monodisperse and had a mean diameter of 13.5 nm. X-ray diffraction patterns indicated that the magnetic nanoparticles were pure Fe3O4 with a spinel structure, and the binding of chitosan did not result in a phase change. The binding of chitosan was also demonstrated by the measurement of zeta potential, and the weight percentage of chitosan bound to Fe3O4 nanoparticles was estimated to be about 4.92 wt%. The chitosan-bound Fe3O4 nanoparticles were shown to be quite efficient for the removal of Cu(II) ions at pH > 2 . In particular, the Adsorption rate was so fast that the Equilibrium was achieved within 1 min due to the absence of internal diffusion resistance. The Adsorption data obeyed the Langmuir equation with a maximum Adsorption capacity of 21.5 mg g−1 and a Langmuir Adsorption Equilibrium Constant of 0.0165 L mg−1. The pH and temperature effects revealed that the Adsorption capacity increased significantly with increasing pH at pH 2–5, and the Adsorption process was exothermic in nature with an enthalpy change of − 6.14 kJ mol −1 at 300–330 K.
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fast Adsorption of methylene blue on polyacrylic acid bound iron oxide magnetic nanoparticles
Dyes and Pigments, 2004Co-Authors: Sou Yee Mak, Dong Hwang ChenAbstract:Abstract The Adsorption of methylene blue (MB) from an aqueous solution by polyacrylic acid-bound iron oxide magnetic nanoparticles was studied. It was shown that the novel magnetic nano-adsorbent was quite efficient for the Adsorption/desorption of MB. In the aqueous solution of MB at 25 °C, the Adsorption data could be fitted by the Langmuir equation with a maximum Adsorption amount of 0.199 mg/mg and a Langmuir Adsorption Equilibrium Constant of 10.1 ml/mg. The Adsorption capacity increased with the increase in solution pH (2–10) and the Adsorption process was endothermic in nature with an enthalpy change (Δ H ) of 30.9 kJ/mol at 10–40 °C. By using the methanol solution of acetic acid, the adsorbed MB could be desorbed. In addition, it was notable that both the Adsorption and desorption of MB were quite fast and could be completed within 2 min due to the absence of internal diffusion resistance.
Ishtiaque Ahamad - One of the best experts on this subject based on the ideXlab platform.
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electrochemical behavior of steel acid interface Adsorption and inhibition effect of oligomeric aniline
RSC Advances, 2013Co-Authors: Dileep Kumar Yadav, Ishtiaque Ahamad, Dheeraj Singh Chauhan, Mumtaz A. QuraishiAbstract:The present work shows the development of new protective oligomeric aniline (O-ANI) and its effect on electrochemical corrosion behavior of low carbon steel (LCS) in 1 M HCl at 308 K. The synthesized O-ANI was subjected to spectroscopic and electrochemical characterizations. The inhibition of LCS corrosion by O-ANI was studied using open circuit potential (OCP), potentiodynamic polarization (PDP), linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) measurements. The potentiodynamic polarization data indicated that O-ANI suppresses predominantly the cathodic process of corrosion reaction in comparison to the anodic process. The inhibition efficiency of the O-ANI depends on the length of the oligomeric chain and position of the functional groups. The spectra of all elements, within limits, on the steel surface was determined by energy-dispersive X-ray spectroscopy (EDX). Morphological changes on the electrode surface were monitored by scanning electron microscopy (SEM). The thermodynamic parameters such as the Adsorption Equilibrium Constant (Kads) and the free energy of Adsorption (ΔG°ads) were calculated and discussed. Several Adsorption isotherms were tested and the experimental data fitted well with the Langmuir Adsorption isotherm. UV-visible spectral analysis of O-ANI solution containing LCS indicates the formation of Fe–N (ligand–metal) charge-transfer complex type interaction.
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inhibition of mild steel corrosion in acid solution by pheniramine drug experimental and theoretical study
Corrosion Science, 2010Co-Authors: Ishtiaque Ahamad, Rajendra Prasad, Mumtaz A. QuraishiAbstract:Inhibition of mild steel corrosion in 1 M HCl solution by Pheniramine drug was studied using weight loss, electrochemical impedance spectroscopy, linear polarization resistance, and potentiodynamic polarization measurements. The values of activation energy (Ea) and different thermodynamic parameters such as Adsorption Equilibrium Constant (Kads), free energy of Adsorption (ΔGads°), Adsorption enthalpy (ΔHads°) and Adsorption entropy (ΔSads°) were calculated and discussed. The Adsorption process of studied drug on mild steel surface obeys the Langmuir Adsorption isotherm. Potentiodynamic polarization measurements showed that Pheniramine is mixed-type inhibitor. Further, theoretical calculations were carried out and relations between computed parameters and experimental inhibition efficiency were discussed.
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inhibition of mild steel corrosion in acid solution by pheniramine drug experimental and theoretical study
Corrosion Science, 2010Co-Authors: Ishtiaque Ahamad, Rajendra Prasad, Mumtaz A. QuraishiAbstract:Inhibition of mild steel corrosion in 1 M HCl solution by Pheniramine drug was studied using weight loss, electrochemical impedance spectroscopy, linear polarization resistance, and potentiodynamic polarization measurements. The values of activation energy (Ea) and different thermodynamic parameters such as Adsorption Equilibrium Constant (Kads), free energy of Adsorption (ΔGads°), Adsorption enthalpy (ΔHads°) and Adsorption entropy (ΔSads°) were calculated and discussed. The Adsorption process of studied drug on mild steel surface obeys the Langmuir Adsorption isotherm. Potentiodynamic polarization measurements showed that Pheniramine is mixed-type inhibitor. Further, theoretical calculations were carried out and relations between computed parameters and experimental inhibition efficiency were discussed.