Corrosion Inhibition Of Aluminum Research Articles

On the identification of favourable factors for corrosion inhibition of aluminium by 8-hydroxyquinoline and its derivatives: DFT and electrochemical studies

On the identification of favourable factors for corrosion inhibition of aluminium by 8-hydroxyquinoline and its derivatives: DFT and electrochemical studies

Exploring the efficacy of Congo Red dye as a corrosion inhibitor for aluminum in HCl solution: An interdisciplinary study with RSM modeling and theoretical simulations

This study investigates Congo Red Textile Dye (CRD) as a corrosion inhibitor for aluminum in a 1.0 mol/L hydrochloric acid solution. Utilizing a comprehensive suite of analytical techniques, including gravimetric analysis, scanning electron microscopy (SEM), ultraviolet–visible spectrophotometry (UV–Vis), Electrochemical Impedance Spectroscopy (EIS), and Potentiodynamic Polarization curves (PDP), we assessed CRD’s adsorption mechanism and its corrosion inhibition effectiveness. Significant corrosion mitigation was observed, with the efficiency of inhibition EI (%) increasing alongside CRD concentration, achieving a maximum efficiency of 87.5 %. This enhancement in EI (%) decreases with rising temperatures, assessed across a range from 298 to 323 K. Response surface methodology (RSM) and central composite design (CCD) were employed for accurate corrosion rates (Vcorr) and EI (%) prediction. Additionally, theoretical analysis was performed using global and local reactivity descriptors along with molecular dynamics (MD) simulations. Theoretical results confirmed the widespread presence of nucleophilic and electrophilic sites, along with a strong affinity for the Al surface, suggesting CRD’s potential for enhancing corrosion resistance. This study proposes a potential pathway for the valorization of Congo Red dye, utilizing concentrations within non-toxic thresholds, thereby aligning with environmental safety and industrial application considerations.

Study of The Inhibition Corrosion of Aluminum Metal Using Peppermint Oil in An Acidic Medium

This study included the study of the efficiency of peppermint oil inhibition of aluminum corrosion in acidic medium HCl at concentrations (0.5, 1, 1.5, 2 M) on the corrosion rate in the presence and absence of the inhibitor peppermint oil at different concentrations (1000, 2000, 3000, 4000 ppm).In order to study the effect of changing the temperature (303, 313, 323, 333 K) on the corrosion rate in the absence and presence of the inhibitor, different concentrations of the inhibitor were chosen in addition to the acid concentration (1M). The experiments were carried out using the weight loss method to calculate the erosion rate. The expected heat of adsorption enthalpy was (-29.913 KJ/mol), with a negative sign indicates that the process is exothermic. The value of the free energy of adsorption ranged from (11.086-15.067 KJ/mol. (The results showed that Freundlich adsorption isotherm equation is the best fit to examine the adsorption process, also a scanning electron microscope. Showed the surface of aluminum before and after corrosion according to the results of the study, it was found that the used inhibitor reduces corrosion in acidic media. Its anti-corrosion efficacy also improves with increasing inhibitor concentration and with decreasing temperature.

Eco-friendly methanolic Ajuga orientalis extract as corrosion inhibitor for aluminium in 1.0 M NaOH

The inhibitory impact of the methanolic Ajuga orientalis (MAO) extract on Al corrosion in 1.0 M NaOH solution was examined using weight loss with electrochemical polarisation and scanning electron microscopy (SEM) techniques. According to the findings, the extract was an effective inhibitor in basic condition, as well as inhibition effectiveness increased with concentration. Furthermore, temperature studies revealed a loss in efficiency followed by a rise when temperature rose, followed by an increase and a fall in the fundamental media when the temperature increased from 30 °C to 50 °C. Frumkin, Freundlich and El Awady isotherms were used to mimic the inhibitor's adsorption properties. For the inhibitory behaviour, physical and chemical adsorption mechanisms are proposed. The adsorption process's thermodynamic parameters (ΔH*, ΔS* and Ea) were determined and explained. The inhibitor was examined as a mixed-type (anodic and cathodic) inhibitor based on polarisation studies. The inhibitor, according to the SEM data, is partially coating the metal surface, providing it with a reasonable amount of protection. The findings from weight loss, electrochemical polarisation, SEM and quantum chemical calculations collectively demonstrate a strong consensus, indicating that the MAO extract exhibits high effectiveness as an inhibitor for aluminium in a basic solution.

Study and Conception of a Potentiostat at Competitive Prices and its Application for Assessing Aluminum Corrosion Inhibition

Study and Conception of a Potentiostat at Competitive Prices and its Application for Assessing Aluminum Corrosion Inhibition

Sumac Extract for Effective Aluminum Corrosion Inhibition in HCl Solution

Sumac Extract for Effective Aluminum Corrosion Inhibition in HCl Solution

Inhibition of corrosion of an aluminum alloy by rosemary and eucalyptus extracted oils in 1M hydrochloric acid medium: an experimental and theoretical study.

In this study, we explored aluminum corrosion inhibition field of study in a 1M HCl solution, harnessing the power of essential oils extracted from rosemary and eucalyptus plants. Our exploration gives a comprehensive analysis of the pivotal factors that shape the corrosion inhibition process. Our scientific journey was marked by a deliberate and systematic approach, encompassing the utilization of gravimetric analysis (weight loss), electrochemical potentiodynamic polarization, and the sophisticated electrochemical impedance spectrometry (EIS) techniques. Our findings unveiled promising and nuanced outcomes, particularly in the area of the electrochemical technique. This method demonstrated remarkable inhibition efficiencies, ranging from 42% to an impressive 92% for rosemary essential oil and from 37 to 84% for eucalyptus essential oil. These results unveiled a dynamic relationship between essential oil concentration and inhibition efficiency, a revelation that further deepens our understanding of the corrosion inhibition process. The inhibition efficiency increased with higher concentrations of essential oil but decreased with elevated temperatures. Furthermore, our analysis traversed into the realms of potentiodynamic and thermodynamic insights. These analytical techniques unearthed the complex mechanisms at play, explaining the pathway followed by the studied inhibitors. They exhibited their prowess by forming protective films on the metal surface, acting as vigilant protectors against the relentless forces of corrosion. Complementing our experimental findings, our study of computational chemistry through density functional theory (DFT) unveiled remarkable insights. It elucidated the spontaneous adsorption process of inhibitor molecules onto the aluminum surface in the presence of H2O solvent. This computational harmony with our experimental results strengthened our confidence in the robustness of our findings. One of the key findings of this study was the superior inhibitory power of camphor in rosemary EO and β-myrcene in eucalyptus essential oil EO, respectively, attributed to the distinctive characteristics of the active sites found in each compound. The inhibitory effectiveness followed the order β-myrcene > camphor > borneol > α-pinene > bornyl acetate > p-cymene > 1,8-cineole. These compounds, notable for their distinct active sites, emerged as exceptional agents in the pursuit of effective corrosion inhibition.

Expired butamirate drug as eco-friendly corrosion inhibitor for aluminum in seawater: Experimental and theoretical studies

In this work, an expired butamirate drug (EBD) was used as a corrosion inhibitor for aluminum in artificial seawater (3.5% NaCl solution). The corrosion rate was evaluated as a function of temperature and inhibitor concentrations using the electrochemical polarization technique. These data indicated that the EBD acts as a mixed-type corrosion inhibitor with a slight effect on the cathodic reaction. Corrosion current densities increased with temperature and decreased with inhibitor concentration. At a temperature of 328 K and an inhibitor concentration of 24 ml/l, the maximum corrosion inhibition efficiency was 84.4%. The cyclic polarization test confirmed the greater pitting resistance in the presence of butamirate drugs in solution. Adsorption studies showed that EBD adsorbed chemically on the metal surface following the Langmuir adsorption isotherm. Electronic microscopy showed enhancements in the surface morphology in the presence of EBD. While FTIR was used for the diagnosis of functional groups in EBD and surface corrosion products. In addition, theoretical quantum chemical calculations were used as a powerful tool to support the experimental studies.

IONIC RADII OF HALIDE IONS AND ITS CORROSION INHIBITORY ENHANCEMENT ON SIDA ACUTA.

Corrosion Inhibitory efficiencies of Sida acuta leaf extracts in combination with halide ions (F-, Cl-, Br- and I-) as an enhancement on aluminum corrosion in H2SO4 was studied at room temperature (25oC) under varying acid concentrations of 0.05M, 0.1M and 0.5M using weight loss method. From the results obtained, Sida acuta acts as a good inhibitor for aluminum corrosion in acidic environment and it's inhibitory efficiencies increases with time of exposure. Based on the experimental results, the corrosion rate increases rapidly in the blank with a weight loss accelerating from 0.009g to 0.038g but with the introduction of plant extract, weight loss got reduced from 0.007g to 0.027g as well as having inhibition efficiency of 36% to 12% as the concentration of the acid was increased from 0.05M to 0.5M over the time series of 24 h to 96 h.. However, the inhibitory efficiency of Sida acuta in H2SO4 medium was further improved when halide ions were introduced. The weight loss of NaI moved from 0.002g to 0.011g and hence had the highest inhibition efficiency among the halide ions from 78% to 50% , NaBr showed a weight loss ranging from from 0.003g to 0.022g as well as having inhibition efficiency of 67% to 42% while NaCl showed a weight loss of 0.005g to 0.023g as well as having inhibition efficiency of 55% to 32% as the acid concentration was increased from 0.005M to 0.5M over the time exposure of 24 h to 96 h.. Nevertheless, the weight loss of NaF increases rapidly from 0.020g to 0.050g even more than the blank under the same reaction conditions and hence does not show inhibition efficiency. Therefore, the increase in inhibition efficiency (%I) and surface coverage (?) in the presence of the halides was found to be in a special sequence. . This synergistic effect increased according to the following pattern Cl- < Br -< I- suggesting a possible role by ionic radii in the corrosion inhibitory process which also increase in the order, F/F – ( 0.072/0.133nm), Cl/ Cl- (0.099/0.181nm) < Br/ Br - ( 0.114/ 0.195nm) < I/ I- ( 0.133/0.216 nm) . Fluoride ion does not show any inhibitory enhancement on Sida acuta owing to its least ionic radius..

IONIC RADII OF HALIDE IONS AND ITS CORROSION INHIBITORY ENHANCEMENT ON SIDA ACUTA.

Corrosion Inhibitory efficiencies of Sida acuta leaf extracts in combination with halide ions (F-, Cl-, Br- and I-) as an enhancement on aluminum corrosion in H2SO4 was studied at room temperature (25oC) under varying acid concentrations of 0.05M, 0.1M and 0.5M using weight loss method. From the results obtained, Sida acuta acts as a good inhibitor for aluminum corrosion in acidic environment and it's inhibitory efficiencies increases with time of exposure. Based on the experimental results, the corrosion rate increases rapidly in the blank with a weight loss accelerating from 0.009g to 0.038g but with the introduction of plant extract, weight loss got reduced from 0.007g to 0.027g as well as having inhibition efficiency of 36% to 12% as the concentration of the acid was increased from 0.05M to 0.5M over the time series of 24 h to 96 h.. However, the inhibitory efficiency of Sida acuta in H2SO4 medium was further improved when halide ions were introduced. The weight loss of NaI moved from 0.002g to 0.011g and hence had the highest inhibition efficiency among the halide ions from 78% to 50% , NaBr showed a weight loss ranging from from 0.003g to 0.022g as well as having inhibition efficiency of 67% to 42% while NaCl showed a weight loss of 0.005g to 0.023g as well as having inhibition efficiency of 55% to 32% as the acid concentration was increased from 0.005M to 0.5M over the time exposure of 24 h to 96 h.. Nevertheless, the weight loss of NaF increases rapidly from 0.020g to 0.050g even more than the blank under the same reaction conditions and hence does not show inhibition efficiency. Therefore, the increase in inhibition efficiency (%I) and surface coverage (?) in the presence of the halides was found to be in a special sequence. . This synergistic effect increased according to the following pattern Cl- < Br -< I- suggesting a possible role by ionic radii in the corrosion inhibitory process which also increase in the order, F/F – ( 0.072/0.133nm), Cl/ Cl- (0.099/0.181nm) < Br/ Br - ( 0.114/ 0.195nm) < I/ I- ( 0.133/0.216 nm) . Fluoride ion does not show any inhibitory enhancement on Sida acuta owing to its least ionic radius..

Study of expired Fuclo 500 drug as an environmentally sustainable corrosion inhibitor

This work deals with aluminium corrosion inhibition by expired drugs containing flucloxacillin in 1 M hydrochloric acid medium, using the gravimetric method and density functional theory. Weight loss results showed that the inhibitory efficiency of this compound increases with concentration and decreases with increasing temperature. The study also indicates that this molecule is adsorbed according to the modified Langmuir model (Villamil model). Furthermore, the thermodynamic parameters of adsorption (∆Goads, ∆Hoads, ∆Soads) and activation (Ea*, ΔHa*, ΔSa*) show that the adsorption is mixed type (chemisorption and physisorption). In addition, density functional theory provides access to the quantum chemical parameters of the molecule such as the lowest vacant orbital energy (ELUMO), the highest occupied orbital energy (EHOMO), the absolute electronegativity (χ), the global hardness (η), the global softness (S), the fraction of transferred electrons (ΔN) as well as the electrophilicity index (ω) for finding correlation between the inhibitor structure and the experimental data.

Chitosan-Based Sustainable Coatings for Corrosion Inhibition of Aluminum in Seawater

Metals are widely used in various industrial applications due to their advantageous properties, but they often exhibit signs of degradation over time because of prolonged exposure to environmental conditions. To prevent corrosion, coatings have gained popularity owing to their practicality in maintaining the original shape and dimensions of the object being protected. Nevertheless, traditional coatings may pose significant toxicological and environmental concerns, leading researchers to explore eco-friendly alternatives such as chitosan-based coatings. Chitosan, a biopolymer derived from chitin, is abundant in nature and has been extensively studied for its physicochemical properties, including its potential in the development of new materials. Chitosan-based coatings have shown promise as effective corrosion inhibitors, and this study aims to develop a crosslinked chitosan-based coating from shrimp waste as an alternative to expensive, commercial coatings. Chitosan, and chemically modified polyethylene glycol, polyvinylpyrrolidone, and ammonium paratungstate chitosan coatings of high- and medium molecular weight prepared by the sol-gel technique, were used for the study of corrosion protection of aluminum in 3.5% synthetic seawater. The molecular interactions and structural alterations following cross-linking of chitosan-based coatings was supported by FTIR-ATR. Surface morphology analysis by AFM indicated good coating adsorption on aluminum surfaces. Contact angle measurements showed hydrophilic properties with contact angles >62° and <90°. Physicochemical characterization (molecular weight (kDa), deacetylation (%), humidity (%), and ash (%)) was also carried out. The corrosion inhibition effectiveness was assessed by gravimetric tests after immersion studies, and the results highlighted the MMW-Chi-based coating’s performance.

Eco-Friendly Methanolic Myrrh Extract Corrosion Inhibitor for Aluminum in 1 M HCl.

Aluminum corrosion was inhibited by myrrh extract when it was placed in a solution of 1 M HCl. Several procedures were used for these tests, including weight loss WL, potential dynamic polarization PL, and electrochemical impedance EIS in addition to theoretical calculations like density functional theory (DFT), Fukui functions, and Monte Carlo simulation. Fourier transform infrared spectroscopy was used to analyze the compositional surface of Al. Scanning electron microscopy was used to determine the shape of the Al surface. The inhibition rate of Al corrosion in HCl with varying myrrh extract contents at 25-45 °C was studied. An analysis of the PL curves indicates that myrrh extract is an inhibitor of mixed type. Upon increasing the concentration of myrrh, the inhibition efficiency increased. Moreover, rising temperatures decrease inhibition efficiency. It was discovered that the inhibition process follows the Langmuir isotherm, demonstrating that a monolayer has formed on the surface of aluminum. Theoretical and practical studies proved the validity of the conclusions.

Experimental and theoretical assessments of the chamomile flower extract as a green corrosion inhibitor for aluminum in artificial seawater

The anticorrosive qualities of a number of natural items have been researched because of the growing concern regarding the environmental contamination produced by conventional corrosion inhibitors. Through electrochemical measurements, the current study evaluated the effectiveness of chamomile flower extract (CFE) in preventing the corrosion of aluminum in an artificial seawater solution. Atomic force microscopy (AFM) and scanning electronic microscopy (SEM) were used for surface examination. Utilizing FTIR, the chemical composition of CFE extract was investigated. Density functional theory (DFT) computations were used to conduct theoretical analyses of its main constituents. According to the electrochemical tests, corrosion inhibition increased as inhibitor concentration increased and reached a moderate inhibition efficiency of 75.66% at 20 mL/L. Polarization curves showed that CFE molecules behaved as mixed-type inhibitors and that their adsorption process primarily followed the Freundlich isotherm. Examination of the corroded aluminum surface by SEM and AFM confirmed the adsorption of compounds present in the extract. The main constituents of the natural extract's electronic characteristics were determined using chemical quantum calculations, which also clarified interactions between inhibitors and metal surfaces as well as adsorption modalities.

Corrosion inhibition of aluminum in HBr solutions by nonionic surfactants at different temperatures

Corrosion inhibition of aluminum in HBr solutions by nonionic surfactants at different temperatures

Experimental investigation of the corrosion inhibition of Aluminum by three novel anionic surfactants as green inhibitors in HCl solution

Experimental investigation of the corrosion inhibition of Aluminum by three novel anionic surfactants as green inhibitors in HCl solution

Anticorrosive properties of aqueous Cichorium intybus seeds extract as a sustainable-green inhibitor for aluminum corrosion in hydrochloric acid solution: An experimental and DFT/MC/MD theoretical approach

The inhibitory effect of Cichorium intybus seeds (C. Intybus) on the corrosion behavior of Al 7075 alloy was evaluated in a 1 M HCl acid solution using chemical and electrochemical methods. The adsorption process was proved using FTIR, UV-Vis, Fluorescence, SEM, EDX, AFM, and contact angle measurements. The results reflect that C. Intybus provided excellent protection, and all measurements showed that the inhibition performance of extracts increased by increasing the concentration to reach 93.67% at 12% v/v. Furthermore, this substance functioned as a mixed-type inhibitor to obstruct the anodic and cathodic active sites on the surface of the metal. The study outcomes matched the monolayer Langmuir isotherm, and the calculated adsorption free energy and activation energy reflect that the inhibition mechanism featured the physisorption process. The computational studies were used to provide further confirmation of the adsorption mechanism and to find out how organic inhibitor molecules interact with metal surface using Density Functional Theory (DFT) with Lee/Yang/Parr (B3LYP) level, 6–311 + + G(d,p) as the basis function set calculation, Monte Carlo (MC), and Molecular Dynamic (MD) simulations. The findings showed good agreement with both the experimental and theoretical results. One of the important findings of this work is the possibility of using C. Intybus as a greener alternative and environmentally friendly resource for corrosion inhibition in an acidic medium.

On the efficiency of barbituric acid and its thio derivatives as aluminium corrosion inhibitors: A computational study

The corrosion inhibition efficiency of the barbituric acid and its thio derivatives were herein monitored by the execution of a variety of density functional theory (DFT) computations. The 1,3-diazinane-2,4,6-trione (BA); 6-sulfanylidene-1,3-diazinane-2,4-dione (1S); 2,6-bis(sulfanylidene)-1,3-diazinan-4-one (2S); and 1,3-diazinane-2,4,6-trithione (3S) compounds were devoted as aluminum corrosion inhibitors. Global and local quantum descriptors were determined for the neutral and protonated forms of the modelled inhibitors in gas and aqueous phases. As the global indices indicated, reverse and proportional correlations were noticed between the number of S atoms in the studied inhibitors and their ionization potential and electron affinity. Accordingly, the inhibition efficiency of the studied compounds generally increased in the order BA < 1S < 2S < 3S. In the same line, the obtained values of local nucleophilic and electrophilic Fukui function indices affirmed the further favorability of the 3S compound over other studied analogs. Utilizing molecular dynamics simulations, the most favorable configurations for inhibitor∙∙∙aluminium (Al)(111) complexes were characterized. Binding energy calculations revealed the efficiency of the corrosion inhibition increased in the order BA∙∙∙Al (−0.95 eV) < 1S∙∙∙Al (−1.71 eV) < 2S∙∙∙Al (−2.16 eV) < 3S∙∙∙Al (−2.49 eV). Upon the presented findings, the current work would be a sufficient linchpin for future research related to the aluminium corrosion inhibition process, particularly with the incorporation of acids and their thio derivatives.

Computational DFT analysis and molecular modeling on imidazole derivatives used as corrosion inhibitors for aluminum in acidic media

The corrosion inhibiting effect of imidazole derivatives on aluminum was studied using density functional theory (DFT) calculations to assess the relationship between molecular structures and their corresponding efficiencies. The chemical reactivity of the neutral and protonated species (IM, Me-IM, IMH+ and Me-IMH+) was investigated, and the impact of methyl group substitution on the adsorption ability onto Al(111) surface was examined. Results revealed that the neutral species can be absorbed onto Al(111) surface by forming covalent bond N–Al, implying chemisorption as the mechanism of adsorption. It was also established that, the IMH+ and Me-IMH+ can be adsorbed via the Cl− anion, which was already firstly adsorbed onto the Al(111) surface. The DFT calculations align well with the experimental results, suggesting that introduction of a methyl group at the 2-position of the imidazole ring enhances the adsorption ability.

Electrochemical and computational studies of an expired vilazodone Drug as environmentally safe corrosion inhibitor for aluminum in chloride medium

Through using chemical and electrochemical methods, the theoretical and experimental investigation of the expired vilazodone drug's ability to prevent corrosion on aluminium (Al) in a corrosive medium of HCl (1 M) has been examined. Weighing tests (WL), electrochemical (impedance spectroscopy (EIS), potentiodynamic polarization (PDP)), atomic force microscopy (AFM), scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FTIR) tests at 25 °C have all been used to investigate Vilazodone's capability to prevent corrosion of Al in 1 M HCl in the concentration in the range of 25–150 ppm. The corrosion inhibition effect of the investigate Vilazodone's against Al in acid environment was investigated weight loss and electrochemical methods. The highest % inhibition efficiency (%IE) was 95% resulted from weight loss technique at the highest concentration for inhibitor. According to the PDP data, this examined vilazodone function as a mixed-type inhibitor, impacting both the anodic and cathodic reactions. The inhibitors covered the active points of the metal surface, according to electrochemical impedance spectroscopy (EIS), to prevent corrosion. It was discovered that the inhibitor adsorption on the Al surface obeyed the Langmuir adsorption isothermal model. AFM, SEM, and FTIR surface examinations proved the inhibitor had a significant protective effect against Al dissolution in 1 M HCl. The outcomes from chemical and electrochemical methods are relatively consistent. Vilazodone acted as an effective corrosion inhibitor, according to all of the experimental data.