M. Boudalia - Academia.edu (original) (raw)
Papers by M. Boudalia
Journal of Materials Science: Materials in Electronics, 2018
Cu 2 CoSnS 4 (CCTS) thin films, for the first time, were successfully fabricated by RF magnetron ... more Cu 2 CoSnS 4 (CCTS) thin films, for the first time, were successfully fabricated by RF magnetron sputtering with two different metal precursor stacking sequences followed by sulfurization treatment under kinds of temperatures. Structure, morphology, composition, chemical valence states and optical properties of the as-grown films were discussed by X-ray diffraction (XRD), Raman spectroscopy (Raman), Scanning electron microscopy (SEM), Energy-dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and ultraviolet-visible-near-infrared spectrophotometer (UV-vis-NIR spectrophotometer) respectively. XRD and Raman analysis indicated that the as-obtained Cu 2 CoSnS 4 thin films possess a stannite structure and the crystallinity was improved accompanying the incremental sulfurization temperature under both two depositing orders. The growth mechanism of CCTS films during vulcanization process was also discussed. XRD, Raman spectroscopy and SEM analysis showed that the precursors deposited in Cu/Co/Sn sequence had the best crystallinity after 600 °C sulfurization annealing. Under this preparation condition, XPS analysis showed that the chemical states of the four main elements in the film were Cu (I), Co (II), Sn (IV) and sulfide ions,and it exhibited the direct band gap of 1.58 eV by UV-vis-NIR absorption spectra, which is close to the ideal values for photovoltaic utilization.
Inorganic Chemistry Communications
Materials Today: Proceedings, 2019
Phosphate glasses of the ternary system Bi 2 O 3-Nb 2 O 5-P 2 O 5 were studied in two composition... more Phosphate glasses of the ternary system Bi 2 O 3-Nb 2 O 5-P 2 O 5 were studied in two compositional series, namely xBi 2 O 3-5Nb 2 O 5-(95Àx)P 2 O 5 (serie B), with x = 10-17,5 mol% Bi 2 O 3 , and 10Bi 2 O 3 ÀxNb 2 O 5-(90Àx) P 2 O 5 (serie N), with x = 2,5-15 mol% Nb 2 O 5. Seven homogeneous glassy samples were prepared, and their amorphous structure were confirmed by X-ray diffraction. The dielectric properties such as dielectric constant (e 0) and dielectric loss (tand) were determined as a function of temperature ranging from 100°C to 500°C at a fixed applied frequency of 16 kHz. Replacing P 2 O 5 by Bi 2 O 3 or Nb 2 O 5 decreases the dielectric parameters in both series. These results are attributed to the increase in the cross-link density and the rigidity of the glass, leading therefore to a decrease of the polarization. The usual increasing behavior of (e 0) and (tand) with temperature may be explained by the augmentation of the orientation polarization and the electrical conduction losses values.
![Research paper thumbnail of Study of Pyrazolo[3,4-d] pyrimidine Derivative as Corrosion Inhibitor on 904L stainless Steel in Molar H3PO4](https://attachments.academia-assets.com/83473686/thumbnails/1.jpg)
](The corrosion inhibition of stainless steel type 904 L SS with different concentrations (10-3-10-... more The corrosion inhibition of stainless steel type 904 L SS with different concentrations (10-3-10-6 M) of 1,5-diallyl-1H-pyrazolo[3,4-d] pyrimidine (DPP) in acid solutions was investigated by potentiostatic polarization measurements. The effect of temperature (298-353°K) on corrosion parameters was examined. The open circuit potential values in the presence and absence of DPP noted before and after experiments indicated the formation of passive film on the surface of the samples. It was found that corrosion potential (Ecorr) increases with increasing DPP concentrations, while, corrosion current (icorr) decreases. Inhibition efficiency of DPP in 1M H3PO4 . The inhibitor functions through adsorption and follows languimir isotherm in the acid. Activation energy (Ea) for adsorption of DPP is calculated. The values of ΔGads decreased (attained more negative values) with increasing temperature.
Due to problems of resistance to corrosion, the act ivity of essential oils has now experienced a... more Due to problems of resistance to corrosion, the act ivity of essential oils has now experienced a great revival. Study of the essential oil of the plant Lavandula stoecha s was studied in 2012 in Doukkala area with relatio n to the agricultural. The results show that the level of th e oil extracted there is a majority molecule (L-fen chone) with a percentage of 26 via CPG coupled with MS. The influ ence of phosphate of organic oil of leaves of Lavan dula stoechas [L] on the corrosion inhibition of welded material in phosphoric acid solution was studied us ing the weight-loss method. The electrochemical performance of the inhibitor was also investigated through potentiodynamic polarization. The inhibition effici ency of inhibitor increases with concentration to a ttain 89 % at 1.2 g.L -1 of [L] in the phosphoric acid (40 wt. %) or 5.5M H 3PO 4 with the addition of chemical impurities (4 wt. % of H 2SO 4 and 0.04 wt. % of chloride ions used as KCl). Pola rization studies show that [L]...
The corrosion inhibition of iron in 1M hydrochloric acid solution in the presence of two ester qu... more The corrosion inhibition of iron in 1M hydrochloric acid solution in the presence of two ester quat surfactants; the mono ester quat: dodecanoyloxypropyl dodecyl dimethyl ammonium bromide (MEQ) and the Gemini ester quat: 1,3bis(dodecanoyloxypropyl dimethyl ammonium) propane dibromide (GEQ) was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and surface analysis (SEM) techniques. Tafel curves showed that the corrosion current density decreases with addition of various concentrations of both inhibitors. However, it was noted that GEQ is more efficient than MEQ. Indeed, the inhibition efficiency of GEQ at 2.10 -4 M reaches 96% against 87% for MEQ in acidic media. These surfactants act as good mixed inhibitors. EIS measurements showed that the studied compounds inhibit iron corrosion by adsorption of surfactant molecules on the iron surface. The effect of molecular structure on the inhibition efficiency was studied by theoretical methods (HF...
The effect of a prepared compounds, namely 5-methyl[1,2,4]triazolo[1,5-a]pyrimidin-7-ol (MTP) on ... more The effect of a prepared compounds, namely 5-methyl[1,2,4]triazolo[1,5-a]pyrimidin-7-ol (MTP) on the corrosion of C-steel in 1M HCl solutions has been studied using the potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The results showed that the inhibition efficiency of the investigated compounds was found to depend on the concentration and the nature of the inhibitor. Maximum inhibition efficiency of 94.4% has been achieved using 10 -3 M of MTP inhibitor. Polarization results indicated that this compound behave as mixed type inhibitor. The adsorption of this compound on steel surface followed Langmuir adsorption isotherm. The reactivity of investigated compounds was analyzed through quantum chemical by DFT method to explain the efficiency of this inhibitor as corrosion inhibitor. The Optical microscope (OM) results showed the formation of a protective film on the metal surface in the presence of this additive. Received 08 Nov 2014, Revised 2...
Journal of Bio- and Tribo-Corrosion, 2021
To evaluate, for the first time, the effect of the Moroccan Miswak (Salvadora persica) extract on... more To evaluate, for the first time, the effect of the Moroccan Miswak (Salvadora persica) extract on the corrosion behavior of Ni–Cr dental alloy in artificial saliva, the electrochemical techniques, such as Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES), surface analysis, and metal release were investigated. Data extracted from the obtained electrochemical corrosion tests demonstrated that the resistance to corrosion of Ni–Cr alloy was improved in presence of Miswak extract at various concentrations, due to the protective action created by the adsorption of Miswak extract on the Ni–Cr alloy surface; the concentration of 1000 ppm presents a corrosion inhibition efficiency of 87%. In presence of the Miswak extract, the SEM–EDS and XRD studies confirm the formation of a film on Ni–Cr dental alloy surface and revealed a reduction in the relative dominance of Ni and Cr on the alloy surface. Also the release of Ni, Cr, and Mo ions has been obviously decreased.
The effect of adding [(E)-2-benzylidene-4-(prop-2-ynyl)-2H-benzo[b][1,4]thiazin-3(4H)-one] named ... more The effect of adding [(E)-2-benzylidene-4-(prop-2-ynyl)-2H-benzo[b][1,4]thiazin-3(4H)-one] named (P1), newly synthesized on the electrochemical behavior of mild steel in molar hydrochloric acid was investigated by using the potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements. EIS diagrams show that adsorption of (P1) increases the transfer resistance and decrease the capacitance of interface metal/solution. The inhibition efficiency for this compound studied increased with the increase in the inhibitor concentrations to attain 94% at the 10 -4 M of (P1). The inhibitor (P1) was adsorbed on the steel surface according to the Langmuir adsorption isotherm model. From the adsorption isotherm, some thermodynamic data for the adsorption process were calculated and discussed. Kinetic parameters activation such as activation energy, entropy and enthalpy of activation were evaluated from the effect of temperature on corrosion and inhibition processes. Co...
Organic compounds containing polar groups by which the molecule can become strongly or specifical... more Organic compounds containing polar groups by which the molecule can become strongly or specifically adsorbed on the metal surface constitute most organic inhibitors [1,2]. These inhibitors, containing heteroatoms particularly N, O and S either in the ring or in the side chain in addition to multiple bonds (double and triple bonds), all forms of aromatic rings and polar functional groups (such as-OH,-NH 2 ,-CN,-SH, NO 2 etc.) act as efficient corrosion inhibitors [3]. Many N-heterocyclic compounds have been proved to be effective inhibitors in acid medium [4-23]. Benzodiazepines have these requirements to act as corrosion inhibitors with maximum degree of unsaturation by virtue of the seven membered ring. A review of literature reveals that though there are large numbers of reports on the synthesis and pharmacological activities of benzodiazepines, only very few works have been carried out on their use as corrosion inhibitors [24-26]. In the present work, the inhibition effect of (4Z)-(2-oxopropylidene)-1,2,4,5-tetrahydro-2H-1,5-benzodiazepine-2-one (P1) on the corrosion of mild steel in 1 M HCl was studied using electrochemical methods. Also, the effect of temperature on the corrosion rate was discussed. Both kinetic and standard thermodynamic parameters
Corrosion inhibition of mild steel in normal hydrochloric acid solution at 303 K by Brachychiton ... more Corrosion inhibition of mild steel in normal hydrochloric acid solution at 303 K by Brachychiton essential oil (B.O.) has been studied by potentiodynamic polarization and Electrochemical Impedance Spectroscopy (EIS) measurements. The oil essential of Brachychiton (B.O.), was analyzed by chromatography (HPLC/UV) and FTIR spectra. The results show that this oil is characterized by palmitoleic acid, palmitic acid, stearic acid, oleic acid being the major constituents. The inhibition efficiency increases with the increase of inhibitor concentration. Potentiodynamic polarization studies clearly reveal that the presence of this inhibitor acts like a mixed inhibitor. The effect of temperature on the corrosion behavior of mild steel in 1M HCl with and without oil in the temperature range 303-333 K, indicates that inhibition efficiency increases with temperature. While SEM analysis the formation of protective layer over the steel surface. The adsorption of natural product son the mild steel ...
The metal corrosion in the presence of inhibitor involved many changes occurring on its surface, ... more The metal corrosion in the presence of inhibitor involved many changes occurring on its surface, such as rapid etching and desorption of the inhibitor and the inhibitor itself, in some cases, may undergo decomposition and/or rearrangement [1]. Most of the effective inhibitors used contain heteroatom such as O, N, S and multiple bonds in their molecules that they are adsorbed on the metallic surface [2-12]. Therefore the effect of temperature on the inhibited acid-metal reaction is highly complex. So, this study facilitates the determination of many thermodynamic functions for the inhibition and/or the adsorption processes which contribute in determining the adsorption type of inhibitors. Temperatures effects on acidic corrosion, most often in hydrochloric, phosphoric and sulphuric acids, have been the object of a large number of investigations [13-23]. It is generally assumed that in acid corrosion the inhibitors adsorb on the metal surface, resulting in a structural change of the d...
The corrosion inhibition of stainless steel in 5.5 M H3PO4 by clay has been studied as a possible... more The corrosion inhibition of stainless steel in 5.5 M H3PO4 by clay has been studied as a possible source of ecofriendly inhibitor using potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) methods at 298 K. Results obtained showed that this clay functioned as a corrosion inhibitor for stainless steel in the acidic environment. Inhibition efficiency increased with clay concentration. Polarization curves indicate that this inhibitor acts as a cathodic inhibitor. EIS spectra exhibit one capacitive loop. The charge transfer resistance (Rct) increases with inhibitor concentration, while double layer capacitance (Cdl) decreases. Adsorption of this inhibitor on stainless steel surface obeys the Langmuir adsorption isotherm.
Materials Today: Proceedings
Abstract The present study focuses on the inhibitive action of 1H, 4H, 5H-pyrazolo[3,4-d]pyrimidi... more Abstract The present study focuses on the inhibitive action of 1H, 4H, 5H-pyrazolo[3,4-d]pyrimidine (PPO) as corrosion inhibitor for copper in 3% NaCl solution by electrochemical techniques and gravimetric method. Results indicated that the compound under study exhibited good inhibition activity with a maximum value of 96.5% at 10−3M. The compound was classified as a mixed type inhibitor with an anodic predominance. The protection efficiency was enhanced with increasing the inhibitor concentration and decreased with the increment of temperature. The adsorption of the inhibitor occurred spontaneously and obeyed to Langmuir isotherm. Monte Carlo simulations showed that PPO had a high adsorption energy and possessed the ability to replace pre-adsorbed aggressive species on copper surface and then formed a protective film. PPO was adsorbed in a parallel configuration providing better coverage of the metal surface.
Journal of Bio- and Tribo-Corrosion
In this investigation, the objective of our research was to evaluate the influence of the corrosi... more In this investigation, the objective of our research was to evaluate the influence of the corrosion behavior of CoCrMo dental alloy in the presence of the oral bacteria Streptococcus mutans (Streptococcus mutans) and its growth byproducts. The corrosion resistance of the dental alloy CoCrMo followed a comparative study in the sterilized Fusayama’s artificial saliva (FAS) containing Trypticase soy broth (TSB) (medium 1) and Streptococcus mutans mixed with (TSB) and (FAS) (medium 2). To perform this study, electrochemical corrosion tests including open circuit potential (OCP), potentiodynamic polarization (PDP), and impedance spectroscopy (EIS) measurements and inductively coupled plasma atomic emission spectrometry (ICP-AES) were used. The formed films biomass was observed by an optical microscope, after 216 h (9 days) of exposition to medium containing Streptococcus mutans; then, it was verified by SEM–EDS analysis. The results of the electrochemical corrosion showed a significant shift of the corrosion potential and an increase in the corrosion current density (icorr) and the corrosion resistance (Rp) after 24 h of immersion of the alloys in the medium containing Streptococcus mutans. This led to alter the formation of the passive film which reveals the high reactivity of CoCrMo in the presence of Streptococcus mutans, whereas the surface analysis confirmed the biofilm formation once the contact of Streptococcus mutans to CoCrMo alloy surfaces was insured.
Journal of Materials Research and Technology
Essential oil from aerial parts of Artemisia herba-alba from Morocco was hydrodistilled and its c... more Essential oil from aerial parts of Artemisia herba-alba from Morocco was hydrodistilled and its chemical composition oil was investigated by capillary GC and GC/MS. The major components were 1,8-cineole (35.6%) and camphor (24.1%). Artemisia herba-alba essential oil AHAO was tested as corrosion inhibitor of stainless steel (SS) in 1M H 3 PO 4 using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy measurements (EIS) and scanning electronically microscopy (SEM) studies. The results obtained showed that the essential oil of Artemisia reduces the corrosion rate. Tafel polarization method indicates that the plant extract behaves as a mixed type inhibitor. The inhibition efficiency increased with inhibitor concentration to attain 88% at 1 g.L −1 of oil at 298 K. Nyquist diagrams obtained from impedance studies provide results confirming the anti-corrosion effect of the studied plant. The temperature effect on the corrosion behavior of (SS) in 1M H 3 PO 4 without and with AHAO at 1 g.L −1 was studied in the temperature range from 298 to 353 K. Thermodynamic parameters suggested that the adsorption is spontaneous and exothermic process and support physical adsorption mechanism. The experimental data fits well into the Langmuir adsorption isotherm model. SEM/EDS studies provide the confirmatory evidence for the protection of (SS) by the green inhibitor. The results obtained from these methods used are in good agreement.
Optik
Abstract Quaternary compound Cu2CoSnS4 (CCTS) is a potential candidate absorber layer in thin fil... more Abstract Quaternary compound Cu2CoSnS4 (CCTS) is a potential candidate absorber layer in thin film solar cells. In this work the Cu2CoSnS4 (CCTS) thin film was synthesized by co-electrodeposition of Cu-Co-Sn-S precursors on Molybdenum substrate, followed by a high temperature (500 °C) sulfurization under Argon atmosphere. The effect of the electrodeposition time of CCTS precursors (Cu, Sn, Co, S) on the crystallographic structure, morphology, composition and optical band gap of CCTS thin films was investigated by X-ray diffraction, Raman spectroscopy, scanning electron microscopy and energy dispersion spectroscopy. From the results, it was found that the properties of the sample can be improved by decreasing the deposition time and we have found that as the deposition time increases, the amount of the secondary phase Cu2-xS increases. The elemental composition is enriched in Co and S and depleted in Cu with increasing time. The band gap was determined from diffuse reflectance and found for all films in the range of 1.4–1.5 eV.
International Journal of Corrosion, 2013
The influence of temperature (20–80°C) on the electrochemical behaviour of passive films anodical... more The influence of temperature (20–80°C) on the electrochemical behaviour of passive films anodically formed on UB6 stainless steel in phosphoric acid solution (5.5 M H3PO4) has been examined by using potentiodynamic curves, electrochemical impedance spectroscopy, and Mott-Schottky analysis. UB6 stainless steel in contaminated phosphoric acid is characterised by high interfacial impedance, thereby, illustrating its high corrosion resistance. The obtained results show that the films behave as n-type and p-type semiconductors in the potential range above and below the flat band potential, respectively. This behaviour is assumed to be the consequence of the semiconducting properties of the iron oxide and chromium oxide regions which compose the passive film.
International Journal of Electrochemical Science, 2013
The new derivative of 1, 2,3-triazole in basic 8-hydroxyquinoline namely ethyl 4-amino-1-((8-hydr... more The new derivative of 1, 2,3-triazole in basic 8-hydroxyquinoline namely ethyl 4-amino-1-((8-hydroxyquinolin-5-yl)methyl)-1H-1,2,3-triazole-5-carboxylate (EHTC) was synthesized and characterized by NMR spectroscopic. This compound was tested as corrosion inhibitor for carbon steel in a 1.0 M HCl solution using Gravimetric, potentiodynamic polarization curves and electrochemical impedance spectroscopy. Potentiodynamic polarization curves measurements showed that the investigated compound acts as mixte-type inhibitor. Its inhibition efficiency improved with concentration and reached a maximum 91 % at 10-3 M. In addition, the temperature effect on the in the inhibition efficiency of EHTC was also studied in the temperature range of 298-328 K. It is found that the inhibition efficiency decreases with temperature. Indeed, the adsorption of the studied inhibitor on the mild steel was well described by the Langmuir isotherm and the calculated ΔG * ads value showed that corrosion inhibition was controlled by a chemisorptions process. Quantum chemical calculations were used to correlate the inhibition ability of EHTC with its electronic structural parameters.
Journal of Materials Science: Materials in Electronics, 2018
Cu 2 CoSnS 4 (CCTS) thin films, for the first time, were successfully fabricated by RF magnetron ... more Cu 2 CoSnS 4 (CCTS) thin films, for the first time, were successfully fabricated by RF magnetron sputtering with two different metal precursor stacking sequences followed by sulfurization treatment under kinds of temperatures. Structure, morphology, composition, chemical valence states and optical properties of the as-grown films were discussed by X-ray diffraction (XRD), Raman spectroscopy (Raman), Scanning electron microscopy (SEM), Energy-dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and ultraviolet-visible-near-infrared spectrophotometer (UV-vis-NIR spectrophotometer) respectively. XRD and Raman analysis indicated that the as-obtained Cu 2 CoSnS 4 thin films possess a stannite structure and the crystallinity was improved accompanying the incremental sulfurization temperature under both two depositing orders. The growth mechanism of CCTS films during vulcanization process was also discussed. XRD, Raman spectroscopy and SEM analysis showed that the precursors deposited in Cu/Co/Sn sequence had the best crystallinity after 600 °C sulfurization annealing. Under this preparation condition, XPS analysis showed that the chemical states of the four main elements in the film were Cu (I), Co (II), Sn (IV) and sulfide ions,and it exhibited the direct band gap of 1.58 eV by UV-vis-NIR absorption spectra, which is close to the ideal values for photovoltaic utilization.
Inorganic Chemistry Communications
Materials Today: Proceedings, 2019
Phosphate glasses of the ternary system Bi 2 O 3-Nb 2 O 5-P 2 O 5 were studied in two composition... more Phosphate glasses of the ternary system Bi 2 O 3-Nb 2 O 5-P 2 O 5 were studied in two compositional series, namely xBi 2 O 3-5Nb 2 O 5-(95Àx)P 2 O 5 (serie B), with x = 10-17,5 mol% Bi 2 O 3 , and 10Bi 2 O 3 ÀxNb 2 O 5-(90Àx) P 2 O 5 (serie N), with x = 2,5-15 mol% Nb 2 O 5. Seven homogeneous glassy samples were prepared, and their amorphous structure were confirmed by X-ray diffraction. The dielectric properties such as dielectric constant (e 0) and dielectric loss (tand) were determined as a function of temperature ranging from 100°C to 500°C at a fixed applied frequency of 16 kHz. Replacing P 2 O 5 by Bi 2 O 3 or Nb 2 O 5 decreases the dielectric parameters in both series. These results are attributed to the increase in the cross-link density and the rigidity of the glass, leading therefore to a decrease of the polarization. The usual increasing behavior of (e 0) and (tand) with temperature may be explained by the augmentation of the orientation polarization and the electrical conduction losses values.
The corrosion inhibition of stainless steel type 904 L SS with different concentrations (10-3-10-... more The corrosion inhibition of stainless steel type 904 L SS with different concentrations (10-3-10-6 M) of 1,5-diallyl-1H-pyrazolo[3,4-d] pyrimidine (DPP) in acid solutions was investigated by potentiostatic polarization measurements. The effect of temperature (298-353°K) on corrosion parameters was examined. The open circuit potential values in the presence and absence of DPP noted before and after experiments indicated the formation of passive film on the surface of the samples. It was found that corrosion potential (Ecorr) increases with increasing DPP concentrations, while, corrosion current (icorr) decreases. Inhibition efficiency of DPP in 1M H3PO4 . The inhibitor functions through adsorption and follows languimir isotherm in the acid. Activation energy (Ea) for adsorption of DPP is calculated. The values of ΔGads decreased (attained more negative values) with increasing temperature.
Due to problems of resistance to corrosion, the act ivity of essential oils has now experienced a... more Due to problems of resistance to corrosion, the act ivity of essential oils has now experienced a great revival. Study of the essential oil of the plant Lavandula stoecha s was studied in 2012 in Doukkala area with relatio n to the agricultural. The results show that the level of th e oil extracted there is a majority molecule (L-fen chone) with a percentage of 26 via CPG coupled with MS. The influ ence of phosphate of organic oil of leaves of Lavan dula stoechas [L] on the corrosion inhibition of welded material in phosphoric acid solution was studied us ing the weight-loss method. The electrochemical performance of the inhibitor was also investigated through potentiodynamic polarization. The inhibition effici ency of inhibitor increases with concentration to a ttain 89 % at 1.2 g.L -1 of [L] in the phosphoric acid (40 wt. %) or 5.5M H 3PO 4 with the addition of chemical impurities (4 wt. % of H 2SO 4 and 0.04 wt. % of chloride ions used as KCl). Pola rization studies show that [L]...
The corrosion inhibition of iron in 1M hydrochloric acid solution in the presence of two ester qu... more The corrosion inhibition of iron in 1M hydrochloric acid solution in the presence of two ester quat surfactants; the mono ester quat: dodecanoyloxypropyl dodecyl dimethyl ammonium bromide (MEQ) and the Gemini ester quat: 1,3bis(dodecanoyloxypropyl dimethyl ammonium) propane dibromide (GEQ) was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and surface analysis (SEM) techniques. Tafel curves showed that the corrosion current density decreases with addition of various concentrations of both inhibitors. However, it was noted that GEQ is more efficient than MEQ. Indeed, the inhibition efficiency of GEQ at 2.10 -4 M reaches 96% against 87% for MEQ in acidic media. These surfactants act as good mixed inhibitors. EIS measurements showed that the studied compounds inhibit iron corrosion by adsorption of surfactant molecules on the iron surface. The effect of molecular structure on the inhibition efficiency was studied by theoretical methods (HF...
The effect of a prepared compounds, namely 5-methyl[1,2,4]triazolo[1,5-a]pyrimidin-7-ol (MTP) on ... more The effect of a prepared compounds, namely 5-methyl[1,2,4]triazolo[1,5-a]pyrimidin-7-ol (MTP) on the corrosion of C-steel in 1M HCl solutions has been studied using the potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The results showed that the inhibition efficiency of the investigated compounds was found to depend on the concentration and the nature of the inhibitor. Maximum inhibition efficiency of 94.4% has been achieved using 10 -3 M of MTP inhibitor. Polarization results indicated that this compound behave as mixed type inhibitor. The adsorption of this compound on steel surface followed Langmuir adsorption isotherm. The reactivity of investigated compounds was analyzed through quantum chemical by DFT method to explain the efficiency of this inhibitor as corrosion inhibitor. The Optical microscope (OM) results showed the formation of a protective film on the metal surface in the presence of this additive. Received 08 Nov 2014, Revised 2...
Journal of Bio- and Tribo-Corrosion, 2021
To evaluate, for the first time, the effect of the Moroccan Miswak (Salvadora persica) extract on... more To evaluate, for the first time, the effect of the Moroccan Miswak (Salvadora persica) extract on the corrosion behavior of Ni–Cr dental alloy in artificial saliva, the electrochemical techniques, such as Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES), surface analysis, and metal release were investigated. Data extracted from the obtained electrochemical corrosion tests demonstrated that the resistance to corrosion of Ni–Cr alloy was improved in presence of Miswak extract at various concentrations, due to the protective action created by the adsorption of Miswak extract on the Ni–Cr alloy surface; the concentration of 1000 ppm presents a corrosion inhibition efficiency of 87%. In presence of the Miswak extract, the SEM–EDS and XRD studies confirm the formation of a film on Ni–Cr dental alloy surface and revealed a reduction in the relative dominance of Ni and Cr on the alloy surface. Also the release of Ni, Cr, and Mo ions has been obviously decreased.
The effect of adding [(E)-2-benzylidene-4-(prop-2-ynyl)-2H-benzo[b][1,4]thiazin-3(4H)-one] named ... more The effect of adding [(E)-2-benzylidene-4-(prop-2-ynyl)-2H-benzo[b][1,4]thiazin-3(4H)-one] named (P1), newly synthesized on the electrochemical behavior of mild steel in molar hydrochloric acid was investigated by using the potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements. EIS diagrams show that adsorption of (P1) increases the transfer resistance and decrease the capacitance of interface metal/solution. The inhibition efficiency for this compound studied increased with the increase in the inhibitor concentrations to attain 94% at the 10 -4 M of (P1). The inhibitor (P1) was adsorbed on the steel surface according to the Langmuir adsorption isotherm model. From the adsorption isotherm, some thermodynamic data for the adsorption process were calculated and discussed. Kinetic parameters activation such as activation energy, entropy and enthalpy of activation were evaluated from the effect of temperature on corrosion and inhibition processes. Co...
Organic compounds containing polar groups by which the molecule can become strongly or specifical... more Organic compounds containing polar groups by which the molecule can become strongly or specifically adsorbed on the metal surface constitute most organic inhibitors [1,2]. These inhibitors, containing heteroatoms particularly N, O and S either in the ring or in the side chain in addition to multiple bonds (double and triple bonds), all forms of aromatic rings and polar functional groups (such as-OH,-NH 2 ,-CN,-SH, NO 2 etc.) act as efficient corrosion inhibitors [3]. Many N-heterocyclic compounds have been proved to be effective inhibitors in acid medium [4-23]. Benzodiazepines have these requirements to act as corrosion inhibitors with maximum degree of unsaturation by virtue of the seven membered ring. A review of literature reveals that though there are large numbers of reports on the synthesis and pharmacological activities of benzodiazepines, only very few works have been carried out on their use as corrosion inhibitors [24-26]. In the present work, the inhibition effect of (4Z)-(2-oxopropylidene)-1,2,4,5-tetrahydro-2H-1,5-benzodiazepine-2-one (P1) on the corrosion of mild steel in 1 M HCl was studied using electrochemical methods. Also, the effect of temperature on the corrosion rate was discussed. Both kinetic and standard thermodynamic parameters
Corrosion inhibition of mild steel in normal hydrochloric acid solution at 303 K by Brachychiton ... more Corrosion inhibition of mild steel in normal hydrochloric acid solution at 303 K by Brachychiton essential oil (B.O.) has been studied by potentiodynamic polarization and Electrochemical Impedance Spectroscopy (EIS) measurements. The oil essential of Brachychiton (B.O.), was analyzed by chromatography (HPLC/UV) and FTIR spectra. The results show that this oil is characterized by palmitoleic acid, palmitic acid, stearic acid, oleic acid being the major constituents. The inhibition efficiency increases with the increase of inhibitor concentration. Potentiodynamic polarization studies clearly reveal that the presence of this inhibitor acts like a mixed inhibitor. The effect of temperature on the corrosion behavior of mild steel in 1M HCl with and without oil in the temperature range 303-333 K, indicates that inhibition efficiency increases with temperature. While SEM analysis the formation of protective layer over the steel surface. The adsorption of natural product son the mild steel ...
The metal corrosion in the presence of inhibitor involved many changes occurring on its surface, ... more The metal corrosion in the presence of inhibitor involved many changes occurring on its surface, such as rapid etching and desorption of the inhibitor and the inhibitor itself, in some cases, may undergo decomposition and/or rearrangement [1]. Most of the effective inhibitors used contain heteroatom such as O, N, S and multiple bonds in their molecules that they are adsorbed on the metallic surface [2-12]. Therefore the effect of temperature on the inhibited acid-metal reaction is highly complex. So, this study facilitates the determination of many thermodynamic functions for the inhibition and/or the adsorption processes which contribute in determining the adsorption type of inhibitors. Temperatures effects on acidic corrosion, most often in hydrochloric, phosphoric and sulphuric acids, have been the object of a large number of investigations [13-23]. It is generally assumed that in acid corrosion the inhibitors adsorb on the metal surface, resulting in a structural change of the d...
The corrosion inhibition of stainless steel in 5.5 M H3PO4 by clay has been studied as a possible... more The corrosion inhibition of stainless steel in 5.5 M H3PO4 by clay has been studied as a possible source of ecofriendly inhibitor using potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS) methods at 298 K. Results obtained showed that this clay functioned as a corrosion inhibitor for stainless steel in the acidic environment. Inhibition efficiency increased with clay concentration. Polarization curves indicate that this inhibitor acts as a cathodic inhibitor. EIS spectra exhibit one capacitive loop. The charge transfer resistance (Rct) increases with inhibitor concentration, while double layer capacitance (Cdl) decreases. Adsorption of this inhibitor on stainless steel surface obeys the Langmuir adsorption isotherm.
Materials Today: Proceedings
Abstract The present study focuses on the inhibitive action of 1H, 4H, 5H-pyrazolo[3,4-d]pyrimidi... more Abstract The present study focuses on the inhibitive action of 1H, 4H, 5H-pyrazolo[3,4-d]pyrimidine (PPO) as corrosion inhibitor for copper in 3% NaCl solution by electrochemical techniques and gravimetric method. Results indicated that the compound under study exhibited good inhibition activity with a maximum value of 96.5% at 10−3M. The compound was classified as a mixed type inhibitor with an anodic predominance. The protection efficiency was enhanced with increasing the inhibitor concentration and decreased with the increment of temperature. The adsorption of the inhibitor occurred spontaneously and obeyed to Langmuir isotherm. Monte Carlo simulations showed that PPO had a high adsorption energy and possessed the ability to replace pre-adsorbed aggressive species on copper surface and then formed a protective film. PPO was adsorbed in a parallel configuration providing better coverage of the metal surface.
Journal of Bio- and Tribo-Corrosion
In this investigation, the objective of our research was to evaluate the influence of the corrosi... more In this investigation, the objective of our research was to evaluate the influence of the corrosion behavior of CoCrMo dental alloy in the presence of the oral bacteria Streptococcus mutans (Streptococcus mutans) and its growth byproducts. The corrosion resistance of the dental alloy CoCrMo followed a comparative study in the sterilized Fusayama’s artificial saliva (FAS) containing Trypticase soy broth (TSB) (medium 1) and Streptococcus mutans mixed with (TSB) and (FAS) (medium 2). To perform this study, electrochemical corrosion tests including open circuit potential (OCP), potentiodynamic polarization (PDP), and impedance spectroscopy (EIS) measurements and inductively coupled plasma atomic emission spectrometry (ICP-AES) were used. The formed films biomass was observed by an optical microscope, after 216 h (9 days) of exposition to medium containing Streptococcus mutans; then, it was verified by SEM–EDS analysis. The results of the electrochemical corrosion showed a significant shift of the corrosion potential and an increase in the corrosion current density (icorr) and the corrosion resistance (Rp) after 24 h of immersion of the alloys in the medium containing Streptococcus mutans. This led to alter the formation of the passive film which reveals the high reactivity of CoCrMo in the presence of Streptococcus mutans, whereas the surface analysis confirmed the biofilm formation once the contact of Streptococcus mutans to CoCrMo alloy surfaces was insured.
Journal of Materials Research and Technology
Essential oil from aerial parts of Artemisia herba-alba from Morocco was hydrodistilled and its c... more Essential oil from aerial parts of Artemisia herba-alba from Morocco was hydrodistilled and its chemical composition oil was investigated by capillary GC and GC/MS. The major components were 1,8-cineole (35.6%) and camphor (24.1%). Artemisia herba-alba essential oil AHAO was tested as corrosion inhibitor of stainless steel (SS) in 1M H 3 PO 4 using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy measurements (EIS) and scanning electronically microscopy (SEM) studies. The results obtained showed that the essential oil of Artemisia reduces the corrosion rate. Tafel polarization method indicates that the plant extract behaves as a mixed type inhibitor. The inhibition efficiency increased with inhibitor concentration to attain 88% at 1 g.L −1 of oil at 298 K. Nyquist diagrams obtained from impedance studies provide results confirming the anti-corrosion effect of the studied plant. The temperature effect on the corrosion behavior of (SS) in 1M H 3 PO 4 without and with AHAO at 1 g.L −1 was studied in the temperature range from 298 to 353 K. Thermodynamic parameters suggested that the adsorption is spontaneous and exothermic process and support physical adsorption mechanism. The experimental data fits well into the Langmuir adsorption isotherm model. SEM/EDS studies provide the confirmatory evidence for the protection of (SS) by the green inhibitor. The results obtained from these methods used are in good agreement.
Optik
Abstract Quaternary compound Cu2CoSnS4 (CCTS) is a potential candidate absorber layer in thin fil... more Abstract Quaternary compound Cu2CoSnS4 (CCTS) is a potential candidate absorber layer in thin film solar cells. In this work the Cu2CoSnS4 (CCTS) thin film was synthesized by co-electrodeposition of Cu-Co-Sn-S precursors on Molybdenum substrate, followed by a high temperature (500 °C) sulfurization under Argon atmosphere. The effect of the electrodeposition time of CCTS precursors (Cu, Sn, Co, S) on the crystallographic structure, morphology, composition and optical band gap of CCTS thin films was investigated by X-ray diffraction, Raman spectroscopy, scanning electron microscopy and energy dispersion spectroscopy. From the results, it was found that the properties of the sample can be improved by decreasing the deposition time and we have found that as the deposition time increases, the amount of the secondary phase Cu2-xS increases. The elemental composition is enriched in Co and S and depleted in Cu with increasing time. The band gap was determined from diffuse reflectance and found for all films in the range of 1.4–1.5 eV.
International Journal of Corrosion, 2013
The influence of temperature (20–80°C) on the electrochemical behaviour of passive films anodical... more The influence of temperature (20–80°C) on the electrochemical behaviour of passive films anodically formed on UB6 stainless steel in phosphoric acid solution (5.5 M H3PO4) has been examined by using potentiodynamic curves, electrochemical impedance spectroscopy, and Mott-Schottky analysis. UB6 stainless steel in contaminated phosphoric acid is characterised by high interfacial impedance, thereby, illustrating its high corrosion resistance. The obtained results show that the films behave as n-type and p-type semiconductors in the potential range above and below the flat band potential, respectively. This behaviour is assumed to be the consequence of the semiconducting properties of the iron oxide and chromium oxide regions which compose the passive film.
International Journal of Electrochemical Science, 2013
The new derivative of 1, 2,3-triazole in basic 8-hydroxyquinoline namely ethyl 4-amino-1-((8-hydr... more The new derivative of 1, 2,3-triazole in basic 8-hydroxyquinoline namely ethyl 4-amino-1-((8-hydroxyquinolin-5-yl)methyl)-1H-1,2,3-triazole-5-carboxylate (EHTC) was synthesized and characterized by NMR spectroscopic. This compound was tested as corrosion inhibitor for carbon steel in a 1.0 M HCl solution using Gravimetric, potentiodynamic polarization curves and electrochemical impedance spectroscopy. Potentiodynamic polarization curves measurements showed that the investigated compound acts as mixte-type inhibitor. Its inhibition efficiency improved with concentration and reached a maximum 91 % at 10-3 M. In addition, the temperature effect on the in the inhibition efficiency of EHTC was also studied in the temperature range of 298-328 K. It is found that the inhibition efficiency decreases with temperature. Indeed, the adsorption of the studied inhibitor on the mild steel was well described by the Langmuir isotherm and the calculated ΔG * ads value showed that corrosion inhibition was controlled by a chemisorptions process. Quantum chemical calculations were used to correlate the inhibition ability of EHTC with its electronic structural parameters.