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A study of acidic corrosion behavior of Furan-Derived schiff base for mild steel in hydrochloric acid environment: Experimental, and surface investigation

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Abstract

The inhibitive of the mild steel corrosion in a corrosive environment by 2-(5-amino-1,3,4-thiadiazol-2-yl)-5-nitrofuran (ATFuran) has been investigated using gravimetric techniques. ATFuran as investigated corrosion inhibitor exhibited the highest inhibitive efficacy of 83.26% at the highest concentration of inhibitor of 0.005 M studied, for the immersion time of 5 h and a temperature of 30 °C from the gravimetric result. Moreover, the inhibition efficiency was increased with increasing ATFuran concentration and decreasing with exposure time or solution temperature. A reduction in inhibition efficacy with temperature increase is implied to the mechanism of physisorption and may be imputed to increase in the solubility of the precipitated ATFuran molecules on the surface of metal. The number of adsorbed molecules on the surface of the metal decreases regarding the temperature increases which resulted in a deficiency in inhibitive performance. The kinetic studies indicate that the adsorption of tested inhibitor on the metal surface both physical and chemical adsorption. ATFuran obeys the Langmuir adsorption isotherm equation.

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This review article provides critical analysis of literature data regarding the heterocyclization reactions of compounds containing alk-2-en-4-yn-1-one and alk-1-en-4-yn-3-one moieties. We discuss the reactions leading to the formation of furans, 2,3-dihydropyrans, 1,2,3-triazoles, 4,5-dihydro-1Н-pyrazoles, pyrazoles, isoxazoles, pyrimidines, aziridines, as well as a range of more complex fused ringsystems. The biological activity and photophysical properties of the obtained heterocyclic compounds are described. The attention ismainly focused on the studies published during the last 5 years. A total of 87 references are given.
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Two new benzohydrazide Schiff bases, (Z)-2-hydroxy-N′-(2-hydroxy-1,2-diphenylethylidene) benzohydrazide (B1) and (Z)-2-hydroxy-N′-(2-oxo-1,2-diphenylethylidene) benzohydrazide (B2) were synthesized and examined as carbon steel corrosion inhibitors in 1.0 mol L−1 HCl using weight loss (WL) method, potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), Quantum chemical calculations (QCC) and molecular dynamics (MD) simulations. Results showed that both studied Schiff bases are adsorptive corrosion inhibitors, which obeys Langmuir adsorption with predominantly chemisorption. The maximum inhibition efficiencies (based on WL results) were obtained 94.0% and 96.5% for B1 and B2, respectively. Thermodynamics of the adsorption process was studied and the activation parameters of the corrosion reaction were also calculated and discussed. The calculated electronic parameters, EHOMO, ELUMO, the energy gap between HOMO-LUMO and dipole moment could well explain the order of inhibition efficiencies. Molecular dynamic simulations revealed that the inhibitors adsorbed in an almost planar manner, leading to a more efficient adsorption and inhibition.
Article
We studied the inhibition performances of IMB (imidazoline quaternary salt (IM) and benzotriazole (BTAH)) and IMO (IM and octyl phenol ethoxylates (OP)) mixtures as inhibitors of L245 steel placed in 10 vol% HCl solution at 298 K using experimental methods and theoretical calculations. We found that the mixtures adsorb on the steel by an endothermic spontaneous process, and the adsorption model follows Langmuir isotherm. The mixtures exhibit good synergistic inhibition effect, and the inhibition efficiency enhanced in turn (IMB < IMO). The relationship between synergistic effect of organic inhibitors and their energetic position of molecular frontier orbitals was discussed.
Article
The corrosion characteristics of L245 steel were analyzed under H2S atmosphere in stratum water with imidazoline quaternary ammonium salt (IM), and IM mixed with octylphenol polyoxyethene ether (OP). L245 suffered pitting corrosion in solutions with only IM, but pitting corrosion was inhibited in solutions with IM and OP. Local damages of the adsorbed IM film appeared on the steel surface in solutions with only IM. While Cl− accumulated on these areas, surface potentials were lower than surrounding areas, and a small anode/large cathode galvanic corrosion system was formed. The influence of inhibitor on pitting corrosion for L245 steel was discussed.
Article
Scanning electrochemical microscopy was employed to characterize the local surface activity of an AA2024-T3 coated with sol-gel. Corrosion inhibitors were added to the sol-gel either as soluble chemical species, namely 1,2,3-benzotriazole, Na‐(diethyl(dithiocarbamate)), and piperazine, or using Ce(III)-montmorillonite containers. The Scanning electrochemical microscopy was operated in the feedback mode by using ferrocene-methanol as redox mediator. This experimental procedure allowed evaluation of the coating behaviour in damaged and non-damaged areas from the analysis of Z‐approach curves and 2D maps. The results evidence differences in the local electrochemical activity of the modified coatings that correlate well with averaging electrochemical measurements using electrochemical impedance spectroscopy.
Article
A technique for calculation of coefficients in the power-linear function for long-term prediction of corrosion losses of structural metals is presented. The formula consists of a power function at the initial corrosion stage and a linear function at the stationary stage. Conditions for application of the power and power-linear functions for long-term prediction of corrosion losses of technically important metals in various regions of the world are shown. A comparative estimate of predicted corrosion losses of metals based on the equations provided in this study and in ISO CORRAG 9224:2012(E) standard is given.
Article
Steel rebars attain passivity in concrete environment. Passive film can be destroyed by acidification through carbonation and chloride ions from NaCl in concrete. There are different techniques have been employed to mitigate the corrosion problem of steel rebars embedded in concrete. Among different methods inhibitors are very popular and frequently used. Commercially available N, N′-Dimethyl ethanol amine (DMEA) inhibitor is studied in different concentrations of NaCl in saturated Ca(OH)2 solution. The performance of inhibitor was evaluated by potential time, electrochemical impedance spectroscopy and potentiodynamic techniques. DMEA inhibitor is showing 63–74% efficiency and effectively reduces the corrosion rate.
Article
Novel corrosion inhibitor as a green chemical product namely derivative, 2-amino 5-oleyl-1,3,4-thiadiazol (AOT) was synthesized by cyclization of oleic acid. The new corrosion inhibitor was characterized by FT-IR and NMR spectroscopical methods. AOT was evaluated as corrosion inhibitor for mild steel in 1M of Hydrochloric acid solution using Potentiodynamic and Electrochemistry Impedance Spectroscopy (EIS) technique. Results obtained show that AOT acts as a good corrosion inhibitor for mild steel in HCl solution. Theoretical studies were also done for the novel compound AOT.
Article
The acid corrosive consumption hindrance process by Cherry Sticks extraction as a green corrosion inhibitor had been explored by utilizing the weight loss method. Impact of temperatures on the consumption conduct in the existence of the inhibitor at a concentration of 50*10-2 g/L was examined at the temperatures of 30, 40, 50 and 60 °C. The results demonstrate that the green, inhibitor, CSCI (Cherry Sticks Corrosion Inhibitor), guarantees the inhibitive impacts on the corrosion of metal (mild steel) in one molar hydrochloric acid for all inspected conditions. The efficiency increment with concentration augmentation of the green inhibitor achieves its maximum of 89.5% at 50*10-2 g/L, and its adsorption on a metal surface obeys Langmuir isotherm. To examine the surface morphology of an inhibitor, SEM (scanning electron microscopy) was utilized before and after submersion in HCl. Green inhibitor was extracted and its structures were clarified and affirmed utilizing the following spectroscopical methods: infra_red (IR), and liquid-Chromatography Electrospray-Ionization Mass-Spectrometry (LC-EIS/MS).
Article
The present paper deals with the adsorption and inhibitory effects of the pyridine derivatives, namely 2-amino-6-(2,4-dihydroxyphenyl)-4-(4-methoxyphenyl)nicotinonitrile (ADP) and 2-amino-4-(4-methoxyphenyl)-6-phenylnicotinonitrile (AMP) on N80 steel corrosion in 15% HCl. Among the studied compounds, ADP showed the inhibition efficiency of 90.24% at 200 mg/L. The corrosion study was performed by gravimetric, electrochemical impedance spectroscopy (EIS), Tafel polarization, scanning electron microscopy (SEM), scanning electrochemical microscopy (SECM) and energy-dispersive X-ray spectroscopy (EDX) techniques. The Langmuir isotherm model showed the best fit. The quantum chemical study was used to support the experimental results. 2015 Elsevier Ltd. All rights reserved.
Article
Synergistic effects of the addition of KI on the corrosion inhibitive performance of a coumarin derivative on an aluminum alloy in 1.0 M H2SO4 at different temperatures were studied using various electrochemical measurements. Density functional theory was used to calculate the quantum chemical parameters of the coumarin derivative. The experimental results showed that the coumarin derivative is considered as a mixed-type inhibitor. The corrosion potential values were almost unchanged upon the addition of PBBC to the acidic solution. The inhibition efficiency increases with increasing inhibitor concentration and increases further in the presence of 6.02 mM KI but decreases significantly at higher temperature. The adsorption of PBBC obeyed the Langmuir isotherm, and being chemically adsorbed at lower temperatures, while physical adsorption is favoured at higher temperature. The theoretical results indicated that the coumarin derivative was adsorbed onto the surface of Al2024 through the sulfur, oxygen and nitrogen atoms.
Article
The inhibition performance of poly (methacrylic acid) (PMAA) and the effect of addition of iodide ions on the inhibition efficiency for mild steel corrosion in 0.5 M H2SO4 solution were investigated in the temperature range of 303-333 K using electrochemical, weight loss, scanning electron microscopy (SEM), and water contact angles measurements. The results show that PMAA is a moderate inhibitor for mild steel in 0.5 M H2SO4 solution. Addition of small amount of KI to PMAA significantly upgraded the inhibition efficiency up to 96.7%. The adsorption properties of PMAA and PMAA + KI are estimated by considering thermodynamic and kinetic parameters. The results reveal that PMAA alone was physically adsorbed onto the mild steel surface, while comprehensive adsorption mode characterized the adsorption of PMAA + KI. Adsorption of PMAA and PMAA + KI followed Temkin adsorption isotherm. The SEM and water contact angle images confirmed the enhanced PMAA film formation on mild steel surface by iodide ions.
Article
Inhibitory effect of three Schiff bases 2-{[(2-sulfanylphenyl)imino]methyl}]phenol (A), 2-{[(2)-1-(4-methylphenyl)methylidene]amino}-1-benznethiol (B), and 2-[(2-sulfanylphen-yl)ethanimidoyl)]phenol (C) on corrosion of mild steel in 15% HCl solution has been studied using weight loss measurements, polarization and electrochemical impedance spectroscopy (EIS) methods. The results of the investigation show that the compounds A and B with mean efficiency of 99% at 200mg/L additive concentration have fairly good inhibiting properties for mild steel corrosion in hydrochloric acid, and they are as mixed inhibitor. All measurements show that inhibition efficiencies increase with increase in inhibitor concentration. This reveals that inhibitive actions of inhibitors were mainly due to adsorption on mild steel surface. Adsorption of these inhibitors follows the Langmuir adsorption isotherm. Thermodynamic adsorption parameters (Kads, ΔGads) of studied Schiff bases were calculated using the Langmuir adsorption isotherm. Activation parameters of the corrosion process such as activation energies, Ea, activation enthalpies, ΔH∗, and activation entropies, ΔS∗, were calculated by the obtained corrosion currents at different temperatures. Obvious correlation was found between the corrosion inhibition efficiency and the calculated parameters. The obtained theoretical results have been adapted with the experimental data.
Article
By considering adsorption processes of organic compounds as being determined by the electronic distribution in the “anchoring” group of an adsorbate, a correlation has been derived between adsorption measurements and Hammett‐like substituent constants through the use of Linear Free Energy Relations (LFER). The analysis is extended to corrosion inhibitors by assuming that the mechanism of inhibition by organic molecules is chemisorption and that the energetics of the corrosion process per se are unaffected by the addition of substituents on the parent compound.
Article
The corrosion inhibition of nickel in acid solutions by 2-(triphenyl phosphoranylidene) succinic anhydride (2TPSA) has been investigated using DC and AC techniques. The percentage inhibition was up to 85 percent at a concentration of 400 μM of 2TPSA. The inhibitor used was found (1) to shift the corrosion potential to less negative values and (2) to decrease the anodic dissolution of nickel and hydrogen evolution reaction. The effect, however, was more pronounced on the anodic rather than on the cathodic process. The passivation current density (ip) and the capacitance of the double layer (Cd) were also affected by 2TPSA. Experimental findings reported in this paper show that at the critical concentration of 25 μM of 2TPSA, these parameters attain their lowest values and that subsequent increases of inhibitor concentration do not lead to any significative change of either ip or Cd. Inhibition efficiency results obtained from DC (corrosion current and polarization resistance) and AC (charge transfer resistance) were in good agreement. Moreover, the experimental data fit the Flory-Huggins and the Dhar-Flory-Huggins adsorption isotherms with x=3. This result indicates that each organic molecule replaces three adsorbed water molecules on the nickel surface. In addition, the size of the adsorbed 2TPSA molecule was approximately 37.5 A2.
Article
The present research brings new insights on the role of admixed corrosion inhibitors in the processes of cement hydration and rebar corrosion. The admixing of NaCl and the corrosion inhibitors in fresh mortar was found to alter the morphology and microstructure of the hardened mortar at the steel-mortar interfacial region. The admixing of the inhibitors increased the risk of carbonation of cement hydrates at the steel-mortar interfacial region, but partially displaced chloride ions. Chloride and the admixed inhibitors facilitated the formation of different cement hydrates and affected chloride binding at the steel-mortar interfacial region. The admixing of all three inhibitors was found to increase the polarization resistance of steel, indicating reduced corrosion rate of the steel over 48-day exposures to salt ponding
Article
Laboratory investigations were performed in order to assess the effectiveness and the inhibition mechanism of an amino alcohol-based inhibitor currently used as admixture to prevent corrosion of steel in concrete. The investigation was performed in the presence of chloride ions, using solutions simulating the concrete interstitial solution. Electrochemical measurements allowed to conclude that, an inhibitor film is formed on the surface hindering the anodic activity. Furthermore, the analytical investigation through the use of X-ray photoelectron spectroscopy (XPS) shows that the inhibitor film is able to complex with the chloride ion.
Electrochemical and mass loss investigations of new schiff base as corrosion inhibitor for mild steel
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