Two azo derivatives (TODB) and (DODB) were synthesized and characterized as mild steel (MS) corrosion inhibitors in 1 M HCl. Electrochemical data suggest that TODB and DODB are excellent inhibitors. They show anti-bacterial effect against... more
Two azo derivatives (TODB) and (DODB) were synthesized and characterized as mild steel (MS) corrosion inhibitors in 1 M HCl. Electrochemical data suggest that TODB and DODB are excellent inhibitors. They show anti-bacterial effect against SRB.
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The inhibitory effect of three newly synthesized hydrazide derivatives on carbon steel corrosion in hydrochloric acid showed better inhibition efficiency (97.5%) and their inhibition mechanism is presented.
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The influence of indole and 2-oxyindole on the corrosion rate of α-brass in 1M HNO 3 was investigated using weight loss,potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation... more
The influence of indole and 2-oxyindole on the corrosion rate of α-brass in 1M HNO 3 was investigated using weight loss,potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. It was found that the investigated compounds behave as inhibitors. The inhibition efficiency increases with increasing the inhibitor concentration, but decreases with increasing the temperature. The adsorption of these compounds on the α-brass surface follows Langmuir's adsorption isotherm. The electrochemical results indicated that all the investigated compounds act as mixed-type inhibitors. Some thermodynamic parameters for corrosion processes were determined and discussed. The results obtained from chemical and electrochemical techniques were in good agreement.
Page 1. ORIGINAL PAPER Role of some thiadiazole derivatives as inhibitors for the corrosion of C-steel in 1 MH2SO4 AS Fouda Æ FE Heakal Æ MS Radwan Received: 17 January 2008 / Accepted: 3 October 2008 / Published ...
Research Interests: Chemical Engineering, Thermodynamics, Electrochemical Impedance Spectroscopy, Weight Loss, Double Layer, and 9 moreRoom Temperature, Corrosion Inhibition, Applied Electrochemistry, Adsorption Isotherm Models, Charge transfer, Chemical Structure, Corrosion Inhibitor, Synergistic effect, and Adsorption isotherm
ABSTRACT Copper corrosion inhibition in 0.1 M nitric acid (HNO3) solution by some secondary amines, namely, dibutyl amine (C8H20N), diethyl amine (C4H11N), and diphenyl amine (C12H11N), was investigated using potentiodynamic polarization,... more
ABSTRACT Copper corrosion inhibition in 0.1 M nitric acid (HNO3) solution by some secondary amines, namely, dibutyl amine (C8H20N), diethyl amine (C4H11N), and diphenyl amine (C12H11N), was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and electrochemical frequency modulation (EFM) techniques. A significant decrease in the corrosion rate of copper was observed in the presence of the investigated compounds. The corrosion rate was found to depend on the concentration, temperature, and type of inhibitor. The adsorption of these compounds was found to follow the Temkin adsorption isotherm. Tafel polarization data indicated that the investigated amines were inhibiting both cathodic and anodic reactions. The thermodynamic activation parameters of copper dissolution in 0.1 M HNO3 were determined and discussed. The results obtained from the three different techniques were in good agreement. Clear correlation was found between corrosion inhibition efficiency and theoretical parameters obtained from the PM3 semi-empirical method. The experimental results are supported by the theoretical data.
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Inhibition of C-steel corrosion by some thiadiazole derivatives in 1 M HCl was investigated by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM)... more
Inhibition of C-steel corrosion by some thiadiazole derivatives in 1 M HCl was investigated by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) measurements. The inhibition efficiency increased with increase in inhibitor concentration but deceased with rise in temperature. The thermodynamic parameters of corrosion and adsorption processes were determined and discussed. The adsorption of these inhibitors was found to obey Langmuir adsorption isotherm. The results obtained from the three different techniques were in good agreement. Quantum structure-activity relationships have been used to study the effect of molecular structure on inhibition efficiency of the inhibitors. The surface morphology of carbon steel sample was investigated by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) studies
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PurposeThe paper reports an investigation into the use of aqueous extracts of rice bran as a green inhibitor for corrosion of carbon steel in hydrochloric acid (HCl) solution.Design/methodology/approachExtracts from the rice bran were... more
PurposeThe paper reports an investigation into the use of aqueous extracts of rice bran as a green inhibitor for corrosion of carbon steel in hydrochloric acid (HCl) solution.Design/methodology/approachExtracts from the rice bran were used as the main component of an environmentally friendly corrosion inhibitor for use in HCl pickling processes. Inhibition behavior on carbon steel in HCl was investigated by means of mass‐loss tests, polarization curves, electrochemical impedance spectroscopy and atomic force microscopy.FindingsThe results show that the extract exhibited good inhibition performance in 1 M HCl. The inhibition efficiency increased with increase in the concentration of the inhibitor and was only moderately affected by temperature variations in the range 303‐363 K. The inhibitive action was due to adsorption on the A3 steel and the adsorption process was consistent with the Langmuir isotherm. The free energy of adsorption (ΔGads.) was −4.192 kJ/mol. The negative value of...
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Anise extract, was investigated as green corrosion inhibitor of carbon steel in 1 M HCl solution using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM)... more
Anise extract, was investigated as green corrosion inhibitor of carbon steel in 1 M HCl solution using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. Surface morphology was tested using scanning electron microscope (SEM) and energy dispersive X-ray (EDX). The adsorption of the inhibitors on carbon steel surface was found to obey the Langmuir’s adsorption isotherm. The activation and adsorption parameters were calculated and discussed
The inhibitive action of some phenylthiazole derivatives namely: 2-acetylamino-5-p-bromophenylazo-4-phenylthiazole (BPT), 2-acetylamino-5-p-methylphenylazo-4-phenylthiazole (MPT), 2-acetylamino-5-p-methoxyphenylazo-4phenylthiazole (XPT)... more
The inhibitive action of some phenylthiazole derivatives namely: 2-acetylamino-5-p-bromophenylazo-4-phenylthiazole (BPT), 2-acetylamino-5-p-methylphenylazo-4-phenylthiazole (MPT), 2-acetylamino-5-p-methoxyphenylazo-4phenylthiazole (XPT) and 2-acetylamino-5-p-nitrophenylazo-4-phenylthiazole (NPT), on zinc corrosion in 0.2 M HCl has been studied using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS)and electrochemical frequency modulation (EFM) measurements. The results showed that the dissolution rate of zinc decreases with increasing the phenylthiazole derivatives concentration and decreases with raising temperature. Polarization curves indicated that the studied inhibitors act as mixed-type inhibitors. The adsorption of the investigated compounds follows Langmuir adsorption isotherm model. The thermodynamic parameters of adsorption and corrosion processes were determined and discussed.
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... a Department of Chemistry, Faculty of Science, Mansoura University, Mansoura, Egypt. Received 11 April 1985; revised 16 August 1985, 2 October 1985. Available online 22 April 2003. Abstract. ... 13. AA EL-ASMY, PhD thesis, Mansoura... more
... a Department of Chemistry, Faculty of Science, Mansoura University, Mansoura, Egypt. Received 11 April 1985; revised 16 August 1985, 2 October 1985. Available online 22 April 2003. Abstract. ... 13. AA EL-ASMY, PhD thesis, Mansoura University, Egypt (1981). 14. ...
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The inhibiting effect of some thiophene derivatives in 1 M HCl on the corrosion of carbon steel was studied by weight loss, potentiodynamic polarization, electrochemical frequency modulation, (EFM) and electrochemical impedance... more
The inhibiting effect of some thiophene derivatives in 1 M HCl on the corrosion of carbon steel was studied by weight loss, potentiodynamic polarization, electrochemical frequency modulation, (EFM) and electrochemical impedance spectroscopy (EIS) methods .The effect of temperature on the corrosion rate was investigated by the weight loss method and some thermodynamic parameters for corrosion and adsorption processes were determined and discussed. The results show that the inhibition efficiency increased with increase in inhibitor concentration and temperature.The adsorption of thiophene derivatives on the carbon steel surface obeys Langmuir adsorption isotherm. The obtained results indicated that the investigated compounds are chemically adsorbed on the steel surface. Potentiodynamicpolarization studies showed that these compounds are mixed-type inhibitors and the results obtained from the techniques are in good agreement.
Research Interests: Engineering, Chemistry, Water, Electrochemistry, Cyclic Voltammetry, and 15 moreBiological Sciences, Electron Transfer, First-Order Logic, CHEMICAL SCIENCES, First Order Logic, Industrial Waste, Chemical Reaction, Analytical and Bioanalytical Chemistry, Domperidone, Oxidation-Reduction, Electrochemical Oxidation, Differential Pulse Voltammetry, Pharmaceutical Formulation, Pharmaceutical preparations, and Relative Standard Deviation
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The corrosion inhibition efficiency of cochlospermum tinctorium(CTE) on mild steel in 0.5M HClO4 solution has been investigated using weight loss measurements, thermometric measurement and scanning electron microscopy studies. The weight... more
The corrosion inhibition efficiency of cochlospermum tinctorium(CTE) on mild steel in 0.5M HClO4 solution has been investigated using weight loss measurements, thermometric measurement and scanning electron microscopy studies. The weight loss measurement indicates increase corrosion inhibition efficiencies that reaches 92%. The weight loss and thermometric data established that the inhibition efficiency on mild steel increases with increase in the concentration of inhibitor, CTE. The adsorption of CTE obeys Langmuir adsorption isotherm. Thermodynamic parameters (K_ads, ?G_ads^0 ) were calculated using the adsorption isotherm. Activation parameters of the corrosion process (?E_a,??Q?_ads and ?S_ads) were also calculated from the corrosion rates obtained from temperature studies. The adsorption isotherm indicates that the adsorption of CTE inhibitor on the surface of mild steel is physisorption and the thermodynamic values obtained indicates spontaneous and exothermic corrosion proces...
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Corrosion of carbon steel is a major problem that destroys assists of industries and world steel installations; the importance of this work is to introduce new heterocyclic compounds as effective and low-cost corrosion inhibitors.
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The corrosion behavior of carbon steel in 1 M HCl solution in the absence and presence of 4-(2-Cyano-7- hydroxy-4-methylene-hepta-2,5-dienoylamino)-benzoic acid (a), 4-[2-Cyano-3-(4-methoxy -phenyl)-acryloylamino]-benzoicacid.(b),... more
The corrosion behavior of carbon steel in 1 M HCl solution in the absence and presence of 4-(2-Cyano-7- hydroxy-4-methylene-hepta-2,5-dienoylamino)-benzoic acid (a), 4-[2-Cyano-3-(4-methoxy -phenyl)-acryloylamino]-benzoicacid.(b), 4-(2-Cyano-3-phenyl acryloylamino)-benzoic acid (c) ,4-[3-(4-Chloro-phenyl)-2-cyano-acryloylamino]-benzoic acid(d), was investigated using weight loss , potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. The inhibitive action of the investigated compounds was discussed in terms of blocking the electrode surface by adsorption of the molecules through the active centers contained in their structures. The adsorption of these derivatives on carbon steel surface is consistent with Freundlich adsorption isotherm. The effect of temperature on the rate of corrosion in the absence and presence of these compounds were also studied. Physical adsorption mechanism is proposed from the c...
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The corrosion inhibition of C-steel in 1 M HCl was assessed using three newly synthesized hydrazide derivatives (H1, H2 and H3) using weight loss (WL), potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS)... more
The corrosion inhibition of C-steel in 1 M HCl was assessed using three newly synthesized hydrazide derivatives (H1, H2 and H3) using weight loss (WL), potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques. Also, the adsorption of these compounds was confirmed using several techniques such as atomic force microscopy (AFM), Fourier-transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). High inhibition efficiencies were obtained resulting from the constitution of the protective layer on the C-steel surface, which increased with increasing concentration and temperature and reached 91.7 to 96.5% as obtained from the chemical method at 20 Â 10 À6 M at 45 C. The polarization curves refer to these derivatives belonging to mixed-type inhibitors. The adsorption of (H1, H2 and H3)on the CS surface follows the Temkin adsorption isotherm. Inhibition influence of hydrazide derivatives at the molecular level was greatly proven u...
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Synergistic effect of BaCl 2 on the corrosion inhibition efficiency of aqueous Lupine seed extract, on (Cu) in 2 M HNO 3 acid solution has been investigated using weight loss measurements, electrochemical impedance spectroscopy (EIS),... more
Synergistic effect of BaCl 2 on the corrosion inhibition efficiency of aqueous Lupine seed extract, on (Cu) in 2 M HNO 3 acid solution has been investigated using weight loss measurements, electrochemical impedance spectroscopy (EIS), electrochemical frequency modulation (EFM) and potentiodynamic polarization (PP) studies. The results show that inhibition efficiencies on Cu increase with increase in concentration of the extract and enhancement in inhibition efficiency was observed on addition of barium chloride due to synergism. The adsorptions, of extract and extract + BaCl 2 on the surfaces of the corroding metal obey Langmuir isotherms. Polarization studies revealed that lupine extract acts as a mixed type inhibitor. Thermodynamic parameters were calculated using the adsorption isotherms. A probable synergistic mechanism is proposed. The film coated on Cu specimens was analyzed by using Fourier transform infrared spectroscopy (FT-IR). The surface shape was studied by using atomic force microscopy (AFM) analysis.
The effect of an aqueous extract of Arcatium Lappa on the corrosion behavior of mild steel in 1M HCl solution has been investigated by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and... more
The effect of an aqueous extract of Arcatium Lappa on the corrosion behavior of mild steel in 1M HCl solution has been investigated by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and electrochemical frequency modulation techniques. The inhibition efficiency increased with increase in inhibitor concentration but deceased with rise in temperature. The thermodynamic parameters of corrosion and adsorption processes were calculated and discussed. The adsorption of this extract was found to obey Langmuir adsorption isotherm. The potentiodynamic polarization measurements indicated that the extract is of mixed type. The results obtained from the three different techniques were in good agreement.
Research Interests: Polarization and European
Azorhodanine derivatives (HL1-HL5) were tested as corrosion inhibitors for nickel in 2M HNO3 solution using weight loss and galvanostatic polarization techniques. The results showed that these derivatives act as inhibitors for nickel in... more
Azorhodanine derivatives (HL1-HL5) were tested as corrosion inhibitors for nickel in 2M HNO3 solution using weight loss and galvanostatic polarization techniques. The results showed that these derivatives act as inhibitors for nickel in this medium. The inhibition was assumed to occur via adsorption of the inhibitor molecule on the metal surface. Polarization measurements indicated that these compounds act as mixed-type inhibitors, but the cathode is more polarized when an external current was applied. This means that these compounds retard the rate of hydrogen evolution and the rate of dissolution of the metal. Results showed that azorhodanine derivatives are adsorbed on the nickel surface following Temkin's adsorption isotherm. The activation energy and thermodynamic parameters were calculated and discussed at different temperatures (30-45 degrees C).
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ABSTRACT Inhibition of QD36 steel corrosion in 0.5 M HCl solution by aniline derivatives was studied using chemical (weight loss), potentiodynamic polarization and electrochemical frequency modulation measurements. The adsorption process... more
ABSTRACT Inhibition of QD36 steel corrosion in 0.5 M HCl solution by aniline derivatives was studied using chemical (weight loss), potentiodynamic polarization and electrochemical frequency modulation measurements. The adsorption process of studied aniline derivatives on steel surface obeys the Langmuir adsorption isotherm. The values of activation energy (E*a), adsorption equilibrium constant (K ads), free energy of adsorption (ΔG ads° , adsorption enthalpy (ΔH ads° ) and adsorption entropy (ΔS ads° )were calculated and discussed. Potentiodynamic polarization measurements showed that aniline derivatives are mixed-type inhibitors. The results obtained by EFM technique were shown to be in agreement with other chemical and electrochemical techniques. Scaning electron microscope (SEM) was used to study the surface morphology of the QD36 steel in 0.5 M HCl solution in the absence and presence of inhibitors. Further, theoretical calculations were carried out and relations between computed parameters and experimental inhibition efficiency were discussed.
... for AlumiNum in Hydrochloric Acid Solution Abd E1-Aziz S. Fouda*, Hanem A. Mostafa, and Hamed M. Abu-Elnader ... CH3C - NH - NH - C - NH ~/('- O O V: 1-Acetyltrimethylammonium chloride-4-phenyl-3-semicarbazide cHCH/3~ 1~ - CH2 -... more
... for AlumiNum in Hydrochloric Acid Solution Abd E1-Aziz S. Fouda*, Hanem A. Mostafa, and Hamed M. Abu-Elnader ... CH3C - NH - NH - C - NH ~/('- O O V: 1-Acetyltrimethylammonium chloride-4-phenyl-3-semicarbazide cHCH/3~ 1~ - CH2 - Coil - NH - NH - COIl - NH CI-503 ...
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Critical micelle concentrations were determined by conductance measurements .for decyl-, dodecyl-, tetradecyl-and hexadecyltrimethylammonium bromide in water at 25, 60, 95, 130, and 160~ The results are discussed in terms of the... more
Critical micelle concentrations were determined by conductance measurements .for decyl-, dodecyl-, tetradecyl-and hexadecyltrimethylammonium bromide in water at 25, 60, 95, 130, and 160~ The results are discussed in terms of the equi-librium model and the nonlinear ...
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Inhibition of C-steel corrosion by some thiadiazole derivatives in 1 M HCl was investigated by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM)... more
Inhibition of C-steel corrosion by some thiadiazole derivatives in 1 M HCl was investigated by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) measurements. The inhibition efficiency increased with increase in inhibitor concentration but deceased with rise in temperature. The thermodynamic parameters of corrosion and adsorption processes were determined and discussed. The adsorption of these inhibitors was found to obey Langmuir adsorption isotherm. The results obtained from the three different techniques were in good agreement. Quantum structure-activity relationships have been used to study the effect of molecular structure on inhibition efficiency of the inhibitors. The surface morphology of carbon steel sample was investigated by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) studies
The influence of indole and 2-oxyindole on the corrosion rate of α-brass in 1M HNO3 was investigated using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation... more
The influence of indole and 2-oxyindole on the corrosion rate of α-brass in 1M HNO3 was investigated using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. It was found that the investigated compounds behave as inhibitors. The inhibition efficiency increases with increasing the inhibitor concentration, but decreases with increasing the temperature. The adsorption of these compounds on the α-brass surface follows Langmuir’s adsorption isotherm. The electrochemical results indicated that all the investigated compounds act as mixed-type inhibitors. Some thermodynamic parameters for corrosion processes were determined and discussed. The results obtained from chemical and electrochemical techniques were in good agreement.