Corrosion Inhibition Of Aluminum Research Articles

Environment-Friendly Corrosion Inhibitors for Aluminum in Hydrochloric Acid: Quantum and Experimental Research

Environment-friendly materials (e.g., Honey and Mint) are used as corrosion inhibitors for aluminum in hydrochloric acid (HCl) using both the density functional theory (DFT) at the B3LYP/6–31G* basis set level and semi-empirical methods (AM1, PM3, MINDO, and RM1). The aim of this study is to investigate the inhibition efficiency (%IE) in terms of their molecular structure. The quantum chemical parameters such as the highest occupied molecular orbital energy (EHOMO), the lowest unoccupied molecular orbital energy (ELUMO), the energy gap (ΔE), the charge on the reactive core, the hardness (η), and the total energy have all been computed. The MINDO method was used to measure the electronic energies and charge densities of the inhibitors that were used. Theoretical calculations were also carried out, with the findings correlating well with the experimental data. Gravimetry and gasometry measurements were used to investigate the effects of honey and mint on aluminum corrosion in a 1.0 M hydrochloric acid (HCl) solution. In acid solutions, honey and mint were found to be effective inhibitors of aluminum corrosion, with honey being the better option. Because of the adsorption of its components on aluminum surfaces, the inhibitory effect of the used inhibitors was addressed. The higher dipole moment of honey than that of mint caused the adsorption of honey on the aluminum surface better. The IEs measured by gravimetry and gasometry are almost identical.

Natural Sweet Almond Oil as an Effective Green Inhibitor for Aluminum Corrosion in Sulfuric Acid Medium

Natural Sweet Almond Oil as an Effective Green Inhibitor for Aluminum Corrosion in Sulfuric Acid Medium

Electrochemical and computational estimations of cephalosporin drugs as eco-friendly and efficient corrosion inhibitors for aluminum in alkaline solution

In this study, the anionic state of Ceftriaxone sodium (Cefx) and Ceftazidime (Cefz) medication corrosion inhibition capabilities for Al in 0.1 M NaOH solution are explored using various electrochemical analyses. Furthermore, the morphological structure and surface chemical composition of the impact of these drugs on the Al substrate in NaOH are investigated. For the prediction and analysis of interactions between molecule structure and inhibition efficiency, quantum chemical calculations (QC), Monte Carlo simulations (MC), and molecular dynamics (MD) simulations (MD) are performed. The electrochemical findings reveal that the inhibitory effectiveness increases with increasing drug concentrations and declines with rising temperature, reaching a maximum value of 78.4% for 300 ppm Cefx while 59.5% for 300 ppm Cefz at 293 K, implying that Cefx outperforms for Cefz. In addition, the studied drugs act as cathodic inhibitors, and their adsorption is spontaneous and mixed type adsorption in its nature that obeys Freundlich isotherm for Cefz while Temkin isotherm is the best-fitted one for Cefx. Surface analysis and wettability measurements imply that Cefx and Cefz shield the Al against corrosion by surface adsorption and generating a protective hydrophobic film. Thermodynamic activation parameters in the absence and presence of 300 ppm of the studied drugs are calculated and discussed. The energies of the border molecular orbitals and computed molecular parameters for the investigated drugs revealed that anionic Cefx is more readily adsorbed on the Al surface than Cefz. This finding is validated further using MC and MD simulations. Overall, the proposed cephalosporin drugs delivered a cost-effective and facile approach for boosting the efficiency of corrosion inhibitors for Al under aggressive conditions.

Inhibition of Aluminum Corrosion with the Addition of the Tris(pentafluoroethyl)trifluorophosphate Anion to a Sulfonylamide-Based Ionic Liquid for Sodium-Ion Batteries

Ionic liquids (ILs) based on sulfonylamide-type anions have gained widespread utility as electrolytes for secondary batteries. Although sulfonylamide-based IL electrolytes are known to form a stable passivation layer that prevents Al corrosion, the Al electrode in the Na[FSA]-[C2C1im][FSA] ([FSA] = bis(fluorosulfonyl)amide and [C2C1im] = 1-ethyl-3-methylimidazolium) IL, is found to be afflicted by pitting corrosion at potentials above 4 V vs Na+/Na during electrochemical measurement at 90 °C. Therefore, this study investigates the suppressive effect of [FAP]− (FAP = tris(pentafluoroethyl)trifluorophosphate) on the Al corrosion behavior of the IL electrolyte. Here, the inhibited corrosion of the Al electrode is confirmed through a series of cyclic voltammetry measurements, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Charge-discharge tests performed using a Na3V2(PO4)2F3 positive electrode demonstrates that the addition of [FAP]– into the IL enhances cycling performance at the intermediate temperature of 90 °C.

Experimental and computational evaluations of cefotaxime sodium drug as an efficient and green corrosion inhibitor for aluminum in NaOH solution

Avoiding aluminum corrosion in alkaline media is critical in many heavy industrial fields. However, developing facile and effective Al corrosion inhibitors is a key solution for commercialization. In this study, cefotaxime sodium drug (Cefo) is investigated as Al corrosion inhibitor in 0.1 M NaOH. Full electrochemical experiments and theoretical calculations have been investigated under various conditions. Topographical surface analyses such as FESEM/EDAX and XPS are utilized to identify the change in morphological surface and composition of Al surface. According to the electrochemical results, Cefo functions as a cathodic inhibitor, and its inhibition efficacy increases with increasing concentrations up to 300 ppm while decreasing with rising solution temperature. Furthermore, Cefo adsorption on the Al surface is mixed, a spontaneous process that follows Freundlich's adsorption isotherm. Furthermore, the XPS and FESEM/EDAX analyses confirm the existence of protective adsorbed layers on the Al surface. Theoretical simulations support the adsorption of protective Cefo layers onto the Al surface, which is compatible with electrochemical and surface analysis data.

Study of corrosion inhibition of aluminum in acidic media by pineapple crown extract

Abstract The efficiency of pineapple crown extract as corrosion inhibitor of aluminum in 1M H2SO4 acidic medium was tested using weight loss and potentiodynamic methods, at varied inhibitor concentration. Through the data from the weight loss method there was calculated the corrosion rate and pineapple crown extract’s inhibition on aluminum corrosion in acidic medium, at varied inhibitor concentration. Also, with the data obtained from the potentiodynamic method, the polarization curves and Tafel tangents were constructed, while calculating the corrosion rate and inhibition efficiency of pineapple crown extract. Experimental measurements showed that pineapple crown extract acts as a mixed inhibitor and the inhibition efficiency increases with increasing the extract concentration.

Corrosion Inhibition of Aluminum in 1.0 M HCl Solution Using Cystoseira Myrica Extract

Corrosion Inhibition of Aluminum in 1.0 M HCl Solution Using Cystoseira Myrica Extract

Synthesis and characterization of novel ionic liquids based on imidazolium for acid corrosion inhibition of aluminum: Experimental, spectral, and computational study

Three newly ionic liquids namely, 1-bnzyl-2-methyl-3-octyl-1H-imidazol-3-ium bromide, 1-bnzyl-3-decyl-2-methyl-1H-imidazol-3-ium bromide, and 1-bnzyl-3-dodecyl-2-methyl-1H-imidazol-3-ium bromide are synthesized and their chemical structures characterized via different spectra techniques (FT-IR, elemental analysis,and 1H NMR). The corrosion inhibition of newly ionic liquids was evaluated on aluminum alloy in 1 M HCl at varied exposure temperatures (298–318 K) and varied concentrations via various experimental and theoretical methods for example mass loss, electrochemical, spectral, and computational calculations. The results illustrate that these types of ionic liquids inhibit corrosion of aluminum in acid solution with maximum inhibition efficiency was reached 83.2 % at 298 K. The inhibition efficiency increases with the addition of zinc sulfate which has a synergistic impact which was reached to 92.7%. Also, the concentration of ionic liquids and the kind of cation have an impact on the obtained results. The existence of these inhibitors in the acidic solution improves the charge transfer resistance and lessens the double-layer capacitance. The Langmuir adsorption isotherm governs the adsorption of these inhibitors' molecules on the aluminum alloy surface, and they behave as mixed-type inhibitors. The outputs reveal that the computational calculations match the experimental data rather well.

A corrosion inhibitor for aluminum by novel synthesized triazole compounds in basic medium

A corrosion inhibitor for aluminum by novel synthesized triazole compounds in basic medium

Contribution to the corrosion inhibition of Aluminum in 1M HCl by a green inhibition of Pimpinella anisum extract. Experimental and theoretical study (DFT, MC, and MD)

Contribution to the corrosion inhibition of Aluminum in 1M HCl by a green inhibition of Pimpinella anisum extract. Experimental and theoretical study (DFT, MC, and MD)

Gallic Acid as a Potential Green Corrosion Inhibitor for Aluminum in Acidic Solution

Plant extracts are intensively studied as green corrosion inhibitors of aluminum. Because these extracts are complex systems, the influence of their individual constituents on the corrosion of aluminum should be determined. In this work, gallic acid was tested for the first time as a corrosion inhibitor of aluminum in orthophosphoric acid aqueous solution. So far, its potential inhibiting properties in acidic solutions were only suggested based on promising results obtained for various plant extracts. Evaluation of the potential inhibiting properties of gallic acid was performed using electrochemical methods. The corrosion potential, polarization curves, and impedance spectra of aluminum in 0.5 M orthophosphoric acid, at T = 303 K, were determined. The corrosion potential, corrosion current density, and corrosion rate of aluminum in orthophosphoric acid were equal to −1.151 V vs. Ag|AgCl (3M KCl) reference electrode, 36 μA∙cm−2 and 0.39 mm∙year−1, respectively. These values did not change with the addition of gallic acid. The results obtained show that gallic acid does not inhibit aluminum corrosion. UV-Vis absorption spectra of gallic acid solutions and quantum mechanical calculations show that this organic compound did not adsorb onto the aluminum surface under the studied conditions.

Tannins as interphase corrosion inhibitors for aluminum in near‐neutral chloride solutions

AbstractThe addition of tara and quebracho colorado tannins remarkably reduces the corrosion rate of aluminum in near‐neutral and naturally aerated NaCl solutions. The experimental results (potentiodynamic polarization curves, corrosion potential measurements, scanning electron microscopy–energy‐dispersive X‐ray spectroscopy [SEM‐EDS] analysis on exposed surfaces) show that both tannins behave as a mixed‐type corrosion inhibitor of aluminum. In the absence of tannins, the SEM‐EDS analysis of the exposed samples demonstrates the accumulation of corrosion products and the existence of chlorinated compounds adsorbed on the metal surface. In the samples immersed in both tannins solutions, a more homogenous and compact layer is formed over the aluminum surface. Furthermore, in these layers chlorine was not found, revealing a high blocking capacity of the chloride adsorption when the tannins are present. Taking into account these findings, an inhibitory mechanism of aluminum corrosion is proposed. This mechanism is interphase inhibition, which involves the adsorption and incorporation of tannin molecules during the corrosion products passive layer formation, resulting in a protective three‐dimensional structure that retards both anodic and cathodic reactions.

Corrosion inhibition of aluminum in 1 M HCl by novel pyrimidine derivatives, EFM measurements, DFT calculations and MD simulation

• Pyridine-pyrimidine derivatives inhibit aluminum corrosion in the protonated form. • Adsorption of inhibitors is spontaneous and is physical–chemical adsorption. • Characteristic molecular parameters are explored using DFT and MD. • Surface analysis results indicate the presence of a protective surface layer. • EMMD has the greatest inhibition efficiency theoretically and experimentally. Four pyridine-pyrimidine derivatives, namely pyridine-2,6-diamine (PD), pyrimidine-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) are used as effective inhibitors for aluminum corrosion in 1 M HCl solution. The anti-corrosive potential of these heterocyclic compounds has been evaluated by electrochemical frequency modulation (EFM) method, The inhibition efficiency of these inhibitors was strongly associated to the concentration (10 −7 –10 −3 M) and the structure of the molecules; reached a maximum of 95.68% for EMMD at 10 −3 M owing to more anchoring functional groups. The effect of temperature on the corrosion behaviour was assessed at solution temperature range 298–323 K. The four inhibitors adsorbed according to the Langmuir’s adsorption isotherm. Thermodynamic activation parameters for the dissolution process of aluminum in 1 M HCl and inhibited solutions were calculated and discussed. Surface analysis (SEM, EDX, and AFM) confirmed the formation of a protective layer adsorbed on the aluminum surface. In addition, theoretical studies by DFT and MD revealed the correlation between the molecular chemical structure of studied inhibitors and their inhibition efficiency. The adsorption mechanism is revealed by theoretical calculations.

Inhibiting effect of anisidines on corrosion of aluminium in hydrochloric acid

Anisidines ( o-, m- and p-) were used as corrosion inhibitors for aluminium in hydrochloric acid solution. The inhibition efficiency depended on the concentration and type of the anisidine. The inhibition efficiency ranged between 76 and 93% at the highest concentration (80 mM), and between 65 and 85% at the lowest concentration (20 mM) of inhibitor in 0.4 M HCl solution. Inhibition efficiency decreased with rise in temperature, this corresponded to surface coverage of the metal by the inhibitor. The calculated degrees of surface coverage, �, were found to increase with the inhibitor concentration. The results also showed that, the inhibitors were adsorbed on the aluminium surface according to Langmuir adsorption isotherm. Polarization study revealed that all the three anisidines functioned as slightly anodic but significantly cathodic inhibitors.

Efficiency of xylenol orange as corrosion inhibitor for aluminium in trichloroacetic acid

The corrosion of aluminium in trichloroacetic acid (TCA) containing xylenol orange has been studied. In TCA, the corrosion rate increases with the increase in acid concentration. At constant acid concentration, the inhibition efficiency of xylenol orange increases with the inhibitor concentration. At constant inhibitor concentration, the inhibition efficiency decreases with the increase in the acid concentration. As temperature increases, percentage of inhibition decreases. Plot of log (θ/1-θ) versus log C results in a straight line, suggesting that the inhibitor cover both the anodic and cathodic regions through general adsorption following Langmuir isotherm. The polarization curves show very little anodic but significant cathodic polarization.

Amino acetanilides as corrosion inhibitors for aluminum in trichloroacetic acid

Amino acetanilides as corrosion inhibitors for aluminum in trichloroacetic acid

Disperse dyes as corrosion inhibitors for aluminum in trichloroacetic acid

Disperse dyes as corrosion inhibitors for aluminum in trichloroacetic acid

Molebdate as corrosion inhibitor for aluminium 356 in acidic and saline media

Corrosion processes are responsible for huge losses in industry. Though organic, inorganic and mixed material inhibitors were used for a long time to combat corrosion, the environmental toxicity of organic corrosion inhibitors has prompted the search for inorganic corrosion inhibitors. The effect of Molebdate as novel corrosion inhibitors on the corrosion of aluminium 356in acidic and saline media was investigated by electrochemical and weight loss techniques. The effect of inhibitor concentration was also investigated. High resolution scanning electron microscopy equipped with energy dispersive spectroscopy (HR-SEM/EDS) was used to characterize the surface morphology of the metal before and after corrosion. Experimental results revealed that Moleblate in the studied solution decreased the corrosion rate at the different concentrations studied. The experimental results obtained from potentiodynamic polarization method showed that the presence of the Moleblate in 3.5% NaCl and 0.5 M H2SO4 solutions decreases the corrosion current densities (icorr) and corrosion rates (CR), and increases the polarization resistance (Rp). It was observed that the inhibitor efficiency depends on the corrosive media, concentration of the inhibitor and the substrate material. The adsorption characteristics of the Moleblate were also described. Good correlation exists between the results obtained from both methods.

THE INHIBITION ACTIVITY OF TERT-BUTYLHYDROQUINONE TOWARDS CORROSION OF ALUMINUM, COPPER AND STAINLESS STEEL IN BIODIESEL BLEND B20 ALTERNATIVE FUEL

Tert-butylhydroquinone (TBHQ) has been investigated as corrosion inhibitor for aluminum; copper and stainless steel in biodiesel blend B20 by using electrochemical impedance spectroscopy (EIS) method. The results showed that the inhibition efficiency increases with an increase in the concentration of TBHQ but decreases with increasing temperature from 30℃ to 60℃. A maximum inhibition efficiency of about 61.52% for aluminum was recorded for THBQ in biodiesel blend B20 at temperature 30℃ and at a concentration of 4x10-6 M which is the lowest concentration used compared to the concentrations of TBHQ used for the other metals (copper and stainless steel). Theoretical fitting of different isotherms, namely Langmuir, Freundlich, Kinetic-Thermodynamic and Flory-Huggins models were tested to clarify the nature of TBHQ adsorption on the three metal surfaces. The obtained experimental data best fitted Freundlich and Kinetic-Thermodynamic. In addition, the thermodynamic parameters of corrosion and adsorption processes were calculated and discussed. The sign of the Gibb’s free energy of the adsorption obtained suggested that inhibitor molecule has been spontaneously adsorbed onto the three metal surfaces. Positive values obtained for enthalpy change indicated that the adsorption of inhibitor is endothermic. The data clarified that the inhibition of aluminum and copper in biodiesel blend B20 by TBHQ takes place through physicochemical adsorption mechanism, while in stainless steel occurred by physical adsorption mechanism.

A STUDY OF CORROSION INHIBITON EFFECT OF THIOSEMICARBAZIDE BASED SCHIFF BASE ON ALUMINIUM METAL IN ACIDIC MEDIUM

Corrosion is the destruction of metal surface by the reaction with its environment (humidity, gases, acid, alkaline etc.). In this process metal convert in to the more stable form such as sulphide oxide etc. Corrosion of materials and structures is a hindrance to the development of society as it causes significant loss to the economy, leads to pollution, and leads to serious disasters, hence its prevention and control is of great benefit for the humanity. Addition of corrosion inhibitors is one of the practical and easy methods to protect metals and alloys against attack of corrosion in many industrial environments. In this chapter thiosemicarbazide based Schiff base 2-[(3,4-dihydroxy-5-nitrophenyl)methylidene]hydrazine-1-carbothioamide (DHNPMHC) was synthesized and characterized using elemental analysis, FT-IR and UV–Vis methods. The inhibition efficiency of Schiff base DHNPMHC against aluminium corrosion in 0.5 M HCl was examined using mass loss measurement and scanning electron microscopy (SEM). Results showed that DHNPMHC is an effective inhibitor for aluminium corrosion in 0.5 M HCl solution. The inhibition efficiency also increased with concentration of inhibitor increased. Maximum percentage inhibition efficiency 92.6 % (at 4-hour immersion time) is shown at highest concentration of inhibitor 5% (5X10-5M). Adsorption of the inhibitor on the aluminium surface followed Langmuir adsorption isotherm. SEM study of aluminium surface in presence of inhibitor and in absence of inhibitor also supports the inhibition of corrosion in acidic medium. All results show that the Schiff base of thiosemicarbazide (DHNPMHC) is excellent corrosion inhibitor for aluminium in 0.5 M HCl.