Corrosion Inhibition Of Aluminum Research Articles

Electrochemical Evaluation of Acanthocereus Tetragonus Extract Corrosion Inhibitor for Aluminum in NaCl (0.6 M) and HCl (1 M)

In this work, Acanthocereus tetragonus extract from stems ripe was used as corrosion inhibitor for aluminum in NaCl (0.6 M) and HCl (1 M). The extract was added in 50 ppm, 100 ppm, and 200 ppm and evaluated at 0 h, 6 h, 12 h, and 24 h with Linear Polarization Resistance (LPR), Electrochemical Impedance Spectroscopy (EIS), and Polarization Curves (PC). As results, the efficiency shows an increase with longer exposure time. Moreover, the efficiencies reached 76% in NaCl (0.6 M) and 52% in HCl (1 M), with 50 ppm after 24 h in both electrolytes.

Corrosion Inhibition of Aluminium by Alchemilla vulgaris L. Extract in 3 % NaCl Solution

Corrosion Inhibition of Aluminium by Alchemilla vulgaris L. Extract in 3 % NaCl Solution

Corrosion Inhibition of Aluminium in Gas and Acid Media by Some Chalcone-Based N-(3-Aminopropyl)Imidazoles: TD-DFT-Based FMO, Conceptual DFT, QTAIM and EDA Studies

The efficacy and mode of action of five chalcone-based imidazole derivatives as corrosion inhibitors of aluminium metal in gas-phase and acidic medium have been investigated herein via quantum chemical calculations. Dispersion-corrected DFT (DFT-D3) and time-dependent DFT (TD-DFT) calculations were performed at PBE0/def2-TZVP//PBEh-3c and CAM-B3LYP/def2- TZVP levels of theory, respectively. Conceptual DFT, the quantum theory of atoms-in-molecules (QTAIM) and local energy decomposition (LED) analyses have been performed. The LED analysis was performed at the coupled-cluster singles and doubles with perturbative triples (CCSD(T))/def2-SVP level of theory. Frontier molecular orbital energy gaps calculated using the TD-DFT method are found to lie in the range 3.574 - 4.444 eV, indicative of good adsorption and corrosion inhibition efficacies of the investigated molecules. The interactions between aluminium and the inhibitor molecules studied are found to be energetically favorable, owing to negative computed interaction energy values. Furthermore, QTAIM analysis revealed metal-carbon, metal-oxygen and metal-nitrogen interactions in the inhibitor-aluminium complexes, which are predominantly electrostatic in character, according to LED analysis results. Calculated proton affinities (PAs) have revealed the anticorrosion potentials of the investigated inhibitors in acidic medium, with a noticeable dependency on temperature within the range 273.15 - 343.15 K.

Phoenix Dactylifera L. Extracts as Green Corrosion Inhibitor for Aluminum in Acidic Medium

Phoenix Dactylifera L. Extracts as Green Corrosion Inhibitor for Aluminum in Acidic Medium

Gymneme Sylvestre as a Green Corrosion Inhibitor for Aluminum in an Acidic Medium

Gymneme Sylvestre as a Green Corrosion Inhibitor for Aluminum in an Acidic Medium

Inhibition of Aluminium Corrosion in 1M HCl by Pyridoxine Hydrochloride: Thermodynamic and Quantum Chemical Studies

Currently, research in the area of corrosion inhibition is focussed on the development of green corrosion inhibitors. It is with this in mind that pyridoxine hydrochloride, which is vitamin B6, has been tested as a corrosion inhibitor of aluminium in 1M HCl by mass loss, Density Functional Theory (DFT) and Quantitative Structure-Property Relationship (QSPR) methods. The results obtained show that the inhibition efficiency increases with concentration but decreases with increasing temperature. This vitamin is adsorbed on aluminium according to the modified Langmuir isotherm and occurs in two modes: physisorption and chemisorption. Thermodynamic adsorption and activation parameters have been determined and discussed. Finally, QSPR approach was used to find the best set of parameters in order to determine the theoretical inhibition efficiencies from the experimental data. Experimental measurements were found in good collaboration with the theoretical results.

New Biodegradable Nonionic‐Anionic Surfactants Based on Different Fatty Alcohols as Corrosion Inhibitors for Aluminum in Acidic Medium

AbstractTwo series of eco‐friendly nonionic anionic surfactants based on itaconic acid and 1, 6 hexane diol were synthesized. The chemical structures of the prepared surfactant were confirmed by FTIR and 1H NMR spectroscopy. The prepared surfactants were evaluated to prevent the corrosion of aluminum in 1.0 M HCl solution by electrochemical and chemical methods. The data obtained showed that the prepared compounds have good inhibition efficiency (IE%) even at 10−5 M concentrations and act as mixed‐type inhibitors, they do not affect the mechanism of the electrode processes, as well as the IE% increase by increasing the concentrations of the inhibitors, immersion time, and hydrophilic chain length. The high inhibition efficiency is due to the adsorption of the inhibitors molecules on the metal surface and the formation of a protective film. The surface activities of these compounds were also investigated and were correlated to their inhibition efficiencies and chemical structure. Through studying biodegradability of the synthesized surfactants we find that they are readily biodegradable in the environment and thus they are considered as eco‐friendly corrosion inhibitors. Finally, the effect of the addition of these compounds on the aluminum surface was identified by atomic force microscopy (AFM) technique.

Effect of Anisaldehyde as Corrosion Inhibitor for Aluminium in Sulphuric Acid Solution

The inhibition effect of anisaldehyde on the corrosion of aluminium in sulphuric acid was investigated by weight loss method and characterized by Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) analyses. The effect of different inhibitor concentrations was studied at varying temperature (308, 313 and 318 K). It was found that the percentage of inhibition efficiency (% I.E.) increases with increase of inhibitor concentration and decreases with increase in temperature. The values of activation energy and half-life were found to be higher in inhibited acid solution compared to uninhibited acid solution, while that for the rate constant reduced from uninhibited to inhibited acid solution. The negative values of Gibbs free energy of adsorption confirmed the spontaneity of the process. Other thermodynamic parameters such as enthalpy and entropy were also evaluated and discussed. The investigation of adsorption isotherm model indicates that the inhibitor fitted to Langmuir isotherm model. Result of SEM analysis shows how the inhibitor reduced the acid attack on the aluminium surface, and FTIR analysis result of the corrosion product proves the formation of thin layer of inhibitor molecules on aluminium surface.

Conocarpus Erectus Extract as an Eco-Friendly Corrosion Inhibitor for Aluminum in Hydrochloric Acid Solution

Conocarpus Erectus extract was examined as a green corrosion inhibitor for Al in 1 M HCl and evaluated by different methods (chemical & electrochemical methods). Surface checks were used to illustrate the importance of this green extract to Al's corrosion inhibition process. The inhibition efficiency (%IE) increased with the raising of both Conocarpus Erectus extract dose and temperature, indicating that this extract was adsorbed chemically on Al surface. The %IE was 91.1% when the concentration Conocarpus Erectus extract was 300 ppm. Conocarpus Erectus extract inhibits both anodic and cathodic reactions, so it is a mixed kind inhibitor. The %IE of Al occurs by the adsorption process, and this metal is subject to the adsorption, according to Temkin isotherm. The surface examination was detected by utilizing a scanning electron microscope (SEM). The outcome data obtained from all experimental studies are excellent and proved the effectiveness of Conocarpus Erectus extract for Al's corrosion resistance.

Electrodeposited Benzothiazole Phthalocyanines for Corrosion Inhibition of Aluminium in Acidic Medium

Tetrakis[(benzo[d]thiazol-2-yl-thio) phthalocyaninato] gallium(III)chloride (1) and tetrakis[(benzo[d]thiazol-2ylphenoxy) phthalocyaninato] gallium(III)chloride (2) were successfully electrodeposited onto aluminium for corrosion retardation in 1.0 M hydrochloric acid solution. The aim of this study was to compare the corrosion resistance of electrodeposited metallated phthalocyanines. Scanning electron microscopy, X-ray diffraction, electrochemical impedance spectroscopy (EIS), and polarization confirmed the aluminium corrosion inhibition potentials of complexes 1 and 2. EIS and polarization techniques showed that complex 2 performed better than complex 1, with values from EIS measurements of 82% for 1 and 86% for 2 in 1.0 M hydrochloric acid solution. The importance of electrodeposition in industries and a dearth of research on the use of electrodeposited metallated phthalocyanines necessitated this study, and results show that coatings formed by electrodeposition of 1 and 2 onto aluminium reduced its susceptibility to corrosion attack.

Theoretical and Experimental Studies of Different Amine Compounds as Corrosion Inhibitors for Aluminum in Hydrochloric Acid

Density Functional Theory investigations using the B3LYP/6-31G* model have been carried out. Several quantum chemical parameters have been computed to interpret the inhibition activity of 2, 4-dinitrophenylhydrazine, o-phenylenediamine, and hydrazine hydrate. The ranking of the quantum chemical calculations classifies 2, 4-Dinitrophenylhydrazine as high efficient inhibitor among the studied molecules. The correspondence of the lowest energy gap (ΔE = 4.27 eV) for the calculated value (88.9%) of the highest inhibition efficiency (%IE) of 2, 4 Dinitrophenylhydrazine. Therefore, in parallel, the experimental inhibition of aluminum corrosion was tested using amine compounds in 1M hydrochloric acid solution by means of gravimetry and gasometry measurements. These compounds have been found to act as effective corrosion inhibitors for aluminum in the acid solution, and the best one was 2, 4-dinitrophenylhydrazine, represent one of the salient agreements between experimental and theoretical measurements. The data are showing that this inhibitor is appropriate for Langmuir adsorption isotherm. SEM micrographs indicate that the surface coverage increases in the presence of 0.5 mM of 2, 4-dinitrophenylhydrazine inhibitor, which in turn results in the formation of the adsorbed compound on the metal surface and the surface is covered by an inhibitor layer that effectively controls the dissolution of aluminum.

Ashwagandha Extract as Green Sustainable Corrosion Inhibitor for Aluminum in Acidic Solutions

In this study, the employment of Ashwagandha extract (AE) as a green sustainable corrosion inhibitor for aluminum in one molar hydrochloric acid solutions was examined utilizing “mass loss (ML), electrochemical frequency modulation (EFM), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PP) measurements”. The surface examination was analyzed utilizing atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) analysis. The effect of temperature on corrosion demeanor with adding a different dose of AE was investigated within the temperature varieties of 25-45 ºC by ML strategy. The curves of polarization reveal that AE is considered as a mixed sort inhibitor. The performance of inhibition rises with raising the AE concentration and diminished with the temperature ascending. The adsorption of the inhibitor on aluminum surface complies with the Langmuir’s adsorption isotherm and is considered as physisorption. The outcomes attained from chemical and electrochemical methods are in good accord.

Electrochemical and Molecular Dynamic Investigation of Some New Pyrimidine Derivatives as Corrosion Inhibitors for Aluminium in Acid Medium

A new class of corrosion inhibitors, namely, pyridine-2,6-diamine (PD) , pyrimidin-2-amine (PA), 6-amino-3,4-dihydropyrimidine-2(1H)-thione (ADT) and ethyl (R)-6-(4-chlorophenyl)-2-mercapto-4-methyl-1,6-dihydropyrimidine-5-carboxylate (EMMD) has been used. The influence of these pyridine-pyrimidine on the dissolution of aluminum in molar HCl has been investigated using impedance spectroscopy as well as potentiodynamic polarization and molecular dynamics simulations. Impedance spectroscopy data show that values of constant phase elements, CPE are decreased. Polarization resistance and protection efficiency increase with increasing concentration of pyridine-pyrimidine derivatives as the electric double layer increased. Electronic equivalent circuit of the investigated system is suggested. Potentiodynamic polarization results showed that these derivatives are mixed-type inhibitors with mainly cathodic action. Molecular simulations are used to simulate the adsorption of pyridine-pyrimidine, on the aluminum oxide substrate.

2‐hydroxyethilammonium oleate protic ionic liquid as corrosion inhibitor for aluminum in neutral medium

AbstractProtic ionic liquid (PIL) 2‐hydroxyethylammonium oleate (2HEAOl) proved to be a good lubricant for aluminum‐forming processes. However, with the aim of keeping the formed component integrity, it is interesting that the same substance employed during forming does not need to be removed and works out as corrosion inhibitor. Then, the aim of this study was to test the performance of 2HEAOl as corrosion inhibitor for aluminum in neutral 0.5 mol/L NaCl medium by electrochemical characterization. Results showed that the concentration of 5 × 10−4 mol/L was a suitable concentration to promote corrosion inhibition until 72 h at the high chloride concentration studied. The PIL worked out as mixed‐type organic corrosion inhibitor, as it promoted the diminution of the oxygen reduction reaction rate and, in consequence, the pit initiation by its adsorption on the metal surface.

Thermodynamics, adsorption, and response surface methodology investigation of the corrosion inhibition of aluminum by Terminalia chebula Ritz. extract in H3PO4

This study focuses on investigating the effect of Terminalia chebula Ritz. extract (TCE) for corrosion inhibition of Al in phosphoric acid (H3PO4) using potentiodynamic polarization (PDP) technique. In this study, the effect of concentration of TCE extract, the concentration of H3PO4 acid medium, and temperature (T) was investigated on the corrosion current density (icorr) and inhibition efficiency (IE). The TCE was characterized by FTIR analysis, and the adsorption of TCE was justified with the help of kinetic, thermodynamic, adsorption isotherm parameters. The surface morphology study was done using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDXS), and atomic force microscopy (AFM). The study also focuses on identifying the optimum process parameters for obtaining the maximum IE by applying the response surface methodology (RSM) and desirability function approach. The maximum IE of 83.24% was achieved at a temperature of 30 ℃, the concentration of TCE extract of 500 ppm, and H3PO4 acid concentration of 0.5 M. Regression analysis, Pareto chart, normal chart, main effect, and interaction effect plots are employed to acquire an in-depth understanding of process variables on IE. The IE obtained from the experiments and the predicted model is in a close match and a high value of the coefficient of determination (R2 = 99.98%) displays that the generated model was able to estimate the IE accurately from the selected process variables.

Corrosion inhibition of aluminium in phosphoric acid solution using glutaraldehyde as inhibitor

Corrosion inhibition of aluminium in phosphoric acid solution using glutaraldehyde as inhibitor

Adsorption behavior and corrosion rate model of sodium carboxymethyl cellulose (Na-CMC) polymer on aluminium in HCl solution

Adsorption behaviour and corrosion rate of Sodium carboxymethyl cellulose on aluminium was studied. Different concentration levels of Sodium carboxymethyl cellulose (Na-CMC) solution were applied on several prepared and polished aluminium coupons for a corrosion experiment. These coupons were totally immersed in 100ml of 0.5M solution of Hydrochloric acid (HCl) in an open beaker placed in a water bath at varying temperatures for 2-8hrs respectively. At every specified temperature and time interval, the immersed coupon specimen was withdrawn from the test solution, washed, dried and reweighed. The weight loss being the difference in weight of the specimen before and after immersion in the water bath was recorded for every coupon sample. The effects of concentration, temperature and time on corrosion rate were studied and from the various plots, it was observed that increase in the concentration of the inhibitor decreases the corrosion rate. The study of the adsorption behaviour showed that Na-CMC was physically adsorbed on the aluminium coupons and obeyed Freundlich adsorption isotherm with an activation energy of 32K.83j/mol and heat of adsorption of -18.21Kj/mol . The study also established a relationship between the corrosion rate, CR; concentration, C; temperature, T; and time t, through a mathematical model: CR = 3.8-5*T1.1617 - 0.00052t0.6176 - 0.0013C0.8012, the proportion of variance explained (R2) = 0.8658 (86.58%), From the Results of the experiment and the model, Na-CMC was found to be an active corrosion inhibitor of Aluminium in acidic environment.
 Keywords: Adsorption, Aluminium, concentration, Corrosion Rate, Weight Loss

Petiveria alliacea root extract as Green Inhibitor for Acid Corrosion of Aluminium

Corrosion inhibition of aluminium in 0.5M 𝐻 􀀀􀀁􀀂 by methanol root extracts of Petiveria alliacea was investigated by weight loss and linear polarization techniques. The weight loss is concentration dependent and increases with increasing concentration of Petiveria alliacea root extracts (PARE). The inhibitor (PARE) exhibited highest inhibition efficiency of 75.28% at the highest inhibitor concentration of 8g investigated. Inhibition was found to increase with increasing PARE concentration. PARE showed molecular adsorption of phytochemicals present as active ingredients through the hetero atoms in their molecules. Polarization studies showed that the extracts act as a mixed type inhibitor. The inhibitor obeyed the Langmuir adsorption isotherm equation.

Theoretical Investigation of Two Antiabetics Drugs as Corrosion Inhibitors of Aluminium in 1.0 M HCl: Combining DFT and QSPR Calculations

The behavior of two antidiabetic drugs namely N-[(butylamino) carbonyl]-4-methylbenzenesulfonamide or tolbutamide and N-(hexahydrocyclopentapyrrol-2(1H)-ylcarbamoyl)-4-methylbenzenesulfonamide or gliclazide was theoretically evaluated by the Density Functional Theory (DFT) and the Quantitative Structure Property Relationship (QSPR) methods. Theoretical calculations showed a clear correlation between the descriptor parameters and the inhibition efficicencies. It also permitted to identify the reactivity sites. The results reveal that the molecules studied are good inhibitors of aluminium corrosion in 1M hydrochloric acid. Finally, the Quantitative Structure Property Relationship allowed to find the appropriate set of parameters establishing the relationship between the inhibition efficiency and the molecular descriptors.

Tussilago Farfara Extract (TFE) as Green Corrosion Inhibitor for Aluminum in Hydrochloric Acid Solution

The dissolution of aluminum in 2 M HCl medium in the absence and presence of Tussilago Farfara Extract (TFE) was examined utilizing Tafel polarization (TP), electrochemical impedance spectroscopy (EIS), electrochemical frequency modulation (EFM), gasometry and mass reduction techniques. The outcomes of these procedures illustrated that the inhibiting effect of this inhibitor depends on its concentration and chemical composition. The inhibitive impact of TFE illustrated the blocking of the Al surface by adsorption of its components through the reacted atoms contained in its molecules. The adsorption model was obeyed to Langmuir isotherm. The influence of temperature on the dissolution rate in the non-existence and existence of TFE was observed. Tafel polarization indicated that TFE acts as a mixed kind inhibitor. Impedance outcomes illustrated that the dissolution of Al is monitored by charge transfer mode at all concentrations of the extract. Varied surface examinations like XPS, FTIR, and AFM were checked to affirm the presence of the defensive film on the Al surface. All outcomes measured from all procedures are in perfect conformity.