Abdel-Aziz Fouda - Academia.edu (original) (raw)

Papers by Abdel-Aziz Fouda

Catrina: The International Journal of Environmental Sciences

Critical micelle concentration (CMC) for hexadecyltrimethylammonium chloride was determined in wa... more Critical micelle concentration (CMC) for hexadecyltrimethylammonium chloride was determined in water over the temperature range 25 to 160Co using flow conductance cell. From 25 to 160Co the CMC increases by a factor of 10 and the degree of micelle ...

Corrosion of carbon steel is a major problem that destroys assists of industries and world steel ... more 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. Three compounds of carbohydrazide derivatives, namely: 5-amino-N 0-((2methoxynaphthalen-1-yl)methylene)isoxazole-4-carbohydrazide (H4), 2,4-diamino-N 0-((2-methoxynaphthalene-1-yl)methylene) pyrimidine-5-carbohydrazide (H5) and N 0-((2-methoxynaphthalen-1-yl) methylene)-7,7-dimethyl-2,5-dioxo-4a,5,6,7,8,8a-hexahydro-2H-chromene-3-carbohydrazide (H6) were used to examine the efficacy of corrosion of carbon steel in 1 M hydrochloric acid solution. This corrosion efficacy was detected by utilizing various methods including electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), weight loss measurements (WL), surface morphology analyses by atomic force microscopy (AFM), quantum chemical computations based on density functional theory (DFT) and molecular dynamics (MD) simulation. The results indicated that these compounds act as mixed type inhibitors i.e. reduce the corrosion rate of carbon steel due to the formation of a stable protective film on the metal surface and reduce the cathodic hydrogen evolution reaction. As confirmed from impedance, carbohydrazide derivatives molecules are adsorbed physically on metal surface with higher corrosion efficacy reached to (81.5-95.2%) at 20 Â 10 À6 M concentration at room temperature. Temkin isotherm model is the most acceptable one to describe the carbohydrazide derivative molecules adsorption on the surface of carbon steel. Protection mechanism was supported by quantum chemical analyses and Monte Carlo modeling techniques. The theoretical calculations support the experimental results obtained. This proves the use of carbohydrazide derivatives as a very effective inhibitors against the corrosion of carbon steel in acidic media.

RSC Advances

Two azo derivatives (TODB) and (DODB) were synthesized and characterized as mild steel (MS) corro... 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.

RSC Advances, 2021

The inhibitory effect of three newly synthesized hydrazide derivatives on carbon steel corrosion ... more 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.

Journal of Analytical & Pharmaceutical Research, 2017

The influence of Domperidone on the inhibition of carbon steel (CS) corrosion in 1M HCl solutions... more The influence of Domperidone on the inhibition of carbon steel (CS) corrosion in 1M HCl solutions was studied using weight loss (WL), (EIS) electrochemical impedance spectroscopy, electrochemical frequency modulation (EFM) and potentiodynamic polarization (PP) techniques, as well as thermodynamic calculations to explore the adsorption mechanism of Domperidone. The inhibition efficiency (IE %) was found to increase with increasing the dose of the Domperidone and with decreasing temperature. The maximum IE% of 94.9 % was obtained in presence of 1.12x10-4 M. The inhibition action of Domperidone was explained in terms of adsorption on CS surface. The adsorption process follows Langmuir isotherm and kinetic-thermodynamic model. Thermodynamic and kinetic parameters were calculated and discussed. Polarization tests showed that this drug is of mixed type. Corrosion protection properties of the drug have been inferred from FT-IR spectra and by atomic force microscope (AFM).

International Journal of Electrochemical Science, 2017

Synergistic effect of BaCl 2 on the corrosion inhibition efficiency of aqueous Lupine seed extrac... 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 influence of indole and 2-oxyindole on the corrosion rate of α-brass in 1M HNO 3 was investig... 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.

Journal of Applied Electrochemistry, 2008

Page 1. ORIGINAL PAPER Role of some thiadiazole derivatives as inhibitors for the corrosion of C-... more 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 ...

CORROSION, 2012

ABSTRACT Copper corrosion inhibition in 0.1 M nitric acid (HNO3) solution by some secondary amine... 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.

Inhibition of C-steel corrosion by some thiadiazole derivatives in 1 M HCl was investigated by we... 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

Anti-Corrosion Methods and Materials, 2011

PurposeThe paper reports an investigation into the use of aqueous extracts of rice bran as a gree... 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...

Anise extract, was investigated as green corrosion inhibitor of carbon steel in 1 M HCl solution ... 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... 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.

Corrosion science, 1986

... a Department of Chemistry, Faculty of Science, Mansoura University, Mansoura, Egypt. Received... 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. ...

The inhibiting effect of some thiophene derivatives in 1 M HCl on the corrosion of carbon steel w... 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.

Zastita materijala, 2016

Unused Augmentin was investigated as save corrosion inhibitor for α-brass in nitric acid solution... more Unused Augmentin was investigated as save corrosion inhibitor for α-brass in nitric acid solution by different monitoring techniques. The results showed the variation in inhibition performance of the drug with varying concentrations and temperatures. The maximum efficiency was found to be 93.6 % at 300 ppm concentration of the drug for the immersion period of 3 hours at 40 C. Temkin was tested to describe the adsorption behavior of the drug on α-brass surface. Potentiodynamic polarization study clearly revealed that this drug acts as mixed type inhibitor. The results of the electrochemical impedance study showed a decrease in double layer capacitance and increase in charge transfer resistance. Chemical adsorption mechanism is proposed from the calculated thermodynamic parameters for the studied drug. The results of various techniques showed good agreements with each other.

Analytical and Bioanalytical Chemistry, 2007

The redox characteristics of the drug domperidone at a glassy-carbon electrode (GCE) in aqueous m... more The redox characteristics of the drug domperidone at a glassy-carbon electrode (GCE) in aqueous media were critically investigated by differential-pulse voltammetry (DPV) and cyclic voltammetry (CV). In Britton-Robinson (BR) buffer of pH 2.6-10.3, an irreversible and diffusion-controlled oxidation wave was developed. The dependence of the CV response of the developed anodic peak on the sweep rate (ν) and on depolizer concentration was typical of an electrode-coupled chemical reaction mechanism (EC) in which an irreversible first-order reaction is interposed between the charges. The values of the electron-transfer coefficient (α) involved in the ratedetermining step calculated from the linear plots of E p,a against ln (ν) in the pH range investigated were in the range 0.64±0.05 confirming the irreversible nature of the oxidation peak. In BR buffer of pH 7.6-8.4, a well defined oxidation wave was developed and the plot of peak current height of the DPV against domperidone concentration at this peak potential was linear in the range 5.20×10 −6 to 2.40×10 −5 mol L −1 with lower limits of detection (LOD) and quantitation (LOQ) of 6.1×10 −7 and 9.1×10 −7 mol L −1 , respectively. A relative standard deviation of 2.39% (n=5) was obtained for 8.5×10 −6 mol L −1 of the drug. These DPV procedures were successfully used for analysis of domperidone in the pure form (98.2±3.1%), dosage form (98.35± 2.9%), and in tap (97.0±3.6%) and wastewater (95.0± 2.9%) samples. The method was validated by comparison with standard titrimetric and HPLC methods. Acceptable error of less than 3.3 % was also achieved.

Zastita materijala

The effect of Egydronate as the corrosion inhibition of Carbon steel (CS) in 1 M HCl was studied ... more The effect of Egydronate as the corrosion inhibition of Carbon steel (CS) in 1 M HCl was studied by weight loss (WL), hydrogen evaluation (HE), Open circuit potential (EOCP), potentiodynamic polarization (PP), electrochemical impedance spectroscopy (EIS), electron frequency modulation (EFM) and surface examination of the specimens by atomic force microscopy (AFM), energy dispersion spectroscopy (EDS) and scanning electron microscopy (SEM). The results of the inhibition efficiency (IE %) increase with increasing the concentration of inhibitor but decreases with raising the temperature. The adsorption of Egy-dronate on the Csteel surface obeys with Langmuir adsorption isotherm. The adsorption process is spontaneous, endothermic and physical adsorption. The polarization curves show that Egy-dronate is a mixedtype inhibitor tends to anodically more. The results obtained from chemical and electrochemical techniques are a good agreement quality and gives the same behavior of the adsorption of Egydronate drug. All techniques have proved the thin film formation adsorbed on the metal surface as a protective coated to prevent the dissolution metal in the corrosive medium, due to electrostatic attraction between unshared electrons of inhibitor molecules and the positive sites on the metal surface.