Corrosion Inhibition Of Aluminum Research Articles

Aqueous extract of leaves of Morinda tinctoria as a corrosion inhibitor for aluminum in sulphuric acid medium

The corrosion inhibition of aluminum in sulphuric acid using an aqueous extract of leaves of Morinda tinctoria (MT) was studied with weight loss and electrochemical techniques. It was found that the MT extract acts as a good inhibitor for aluminum corrosion in the sulphuric acid medium. The inhibition efficiency of the inhibitor is found to increase with the increase in concentration of the acid. Synergistic effect increased the inhibition efficiency of MT in the presence of halide additives. The process of adsorption of the inhibitor on the metal surface is found to obey Freundlich isotherm. The adsorbed film on the metal surface has been analyzed by FT-IR and SEM-EDXS studies. Polarization measurements showed that MT extract is a mixed type inhibitor. Impedance results indicate adsorption of the MT on the Al surface is through charge transfer.

Expired Voltaren Drugs as Corrosion Inhibitor for Aluminium in Hydrochloric Acid

Expired Voltaren Drugs as Corrosion Inhibitor for Aluminium in Hydrochloric Acid

Chicken Feather Powder as Corrosion Inhibitor for Aluminium in NaOH Solution

Chicken Feather Powder as Corrosion Inhibitor for Aluminium in NaOH Solution

Performance evaluation of phosphite NaCo(H2PO3)3·H2O as a corrosion inhibitor for aluminum in engine coolant solutions

The inhibiting action of a novel inorganic compound (NaCo(H2PO3)3·H2O) (NaCoPh) synthesized in our laboratory on the corrosion of aluminum in engine coolant solutions has been studied.

Corrosion Behavior of Aluminum Base Particulate Metal Matrix Composites: A Review

This paper is concerned with reported work on corrosion behavior of aluminum based particulate metal matrix composites (PMMCs). Corrosion of aluminum based PMMCs begun with its pitting initiation on the interface of the PMMCs. Stress corrosion crack (SCC), Potentiodyanamic test and immersion test in different salinity like 3.5% NaCl, HCl on aluminum based PMMCs have been reported by various authors, which predicts the pitting corrosions. The finding of reported works revealed that corrosion tendency is more in case of SiC, Al2O3, B4C, Fly ash as based PMMC as compared to base alloy, however the opposite trend were reported in the case of TiC and ZrSiO4,.The fabrications route like stir cast, powder metallurgical, in situ, squeeze cast also influence the corrosion behavior. Findings on Corrosion inhibitors for aluminum based PMMCs were also incorporated to have cognizance of various corrosion inhibition treatments.

DFT studies of the bonding mechanism of 8-hydroxyquinoline and derivatives on the (111) aluminum surface.

The 8-hydroxyquinoline (8-HQ) molecule is an efficient corrosion inhibitor for aluminum and is also used in organic electronic devices. In this paper, the adsorption modes of 8-HQ and its derivatives (tautomer, dehydrogenated and hydrogenated species) on the Al(111) surface are characterized using dispersion corrected density functional theory calculations. The 8-HQ molecule is physisorbed and is chemisorbed on the aluminum surface with similar adsorption energy (-0.86 eV to -1.11 eV) and these adsorption modes are stabilized by vdW interactions. The binding of the dehydrogenated species is the strongest one (adsorption energy of -3.27 eV to -3.45 eV), followed by the tautomer molecule (-2.16 eV to -2.39 eV) and the hydrogenated molecule (-1.71 eV) that bind weaker. In all the chemisorbed configurations there is a strong electronic transfer from the Al substrate to the adsorbate (0.72 e to 2.16 e). The adsorbate is strongly distorted and its deformation energy is high (0.55 eV to 2.77 eV). The analysis of the projected density of states onto the orbitals of the molecule and the electronic density variation upon adsorption (Δρ) between the molecule and the surface account for covalent bonding.

Corrosion Inhibition of Aluminum in 0.1M HCL by <i>Ne</i><i>phelium </i><i>la</i><i>ppaceum</i> (Rambutan) Peel Extract

Corrosion control of metals is about technical, economic, environmental, and aesthetic importance. Synthetic corrosion inhibitors are toxic to environment and human life. Thus, the searches for natural corrosion inhibitors are essential as they are biodegradable and non toxic. The purpose of this study is to investigate the ability ofNephelium lappaceumpeel extract as a corrosion inhibitor of aluminum in 0.1M HCl solutions. Obtained data from gravimetric and thermometric analysis has shown the value of inhibition efficiency (% IE) is proportional to added inhibitor concentration and inversely proportional to the temperature. Occurred inhibition mechanism was in the form of inhibitor adsorption process on aluminum surface that allegedly preceded by physical adsorption. The SEM study also confirmed there were adsorptions of extracted inhibitor molecules onto aluminum surface. Therefore, from the observational results obtained, it can be concluded thatNephelium lappaceumpeel extract was an attractive candidate for the natural corrosion inhibitor.

Corrosion Inhibition of Aluminum in NaOH Solutions using some Bidentate Azo Dyes Compounds and Synergistic Action with some Metal Ions

Corrosion Inhibition of Aluminum in NaOH Solutions using some Bidentate Azo Dyes Compounds and Synergistic Action with some Metal Ions

Effect of polyvinylpyrrolidone – polyethylene glycol blends on the corrosion inhibition of aluminium in HCl solution

Purpose– The purpose of this paper is to investigate the effect of polyethylene glycol (PEG), polyvinylpyrrolidone (PVP) and blended formulations on the corrosion inhibition of aluminium in HCl solutions at 30-60°C and to study the mechanism of action.Design/methodology/approach– The inhibitive effect of the homopolymers and polymer blend was assessed using weight loss and hydrogen evolution methods at 30 and 60°C. The morphology of the corroding aluminium surface without and with the additives was visualized using atomic force microscopy. The trend of inhibition efficiency with temperature was used to propose the mechanism of inhibition and type of adsorption.Findings– Results obtained show that inhibition efficiency (η%) increases with increase in concentration of the polymers but decreases with increase in temperature. The inhibition efficiency of the homopolymers and their blends decreased with rise in temperature. Inhibition efficiency was found to be synergistically enhanced on blending the two homopolymers with highest inhibition efficiency obtained for (PEG:PVP) blending ratio of 1:3. The phenomenon of physical adsorption is proposed from the trend of inhibition efficiency with temperature.Research limitations/implications– The mechanistic aspect of the corrosion inhibition can be better understood using electrochemical studies such as potentiodynamic polarization and electrochemical impedance spectroscopy.Originality/value– Studies involving the use of polymer blends/mixtures as corrosion inhibitor for metals in corrosive environments are scarce. The results suggest that the mixture could find practical application in corrosion control in aqueous acidic environment. The data obtained would form part of database on the use of polymer–polymer mixtures to control acid-induced corrosion of metal.

The Inhibition of Aluminum Corrosion in Sulfuric Acid by Poly(1-vinyl-3-alkyl-imidazolium Hexafluorophosphate).

Compounds of poly(ionic liquid)s (PILs), derived from imidazole with different alkylic chain lengths located in the third position of the imidazolium ring (poly(1-vinyl-3-dodecyl-imidazolium) (PImC12), poly(1-vinyl-3-octylimidazolium) (PImC8) and poly(1-vinyl-3-butylimidazolium) (PImC4) hexafluorophosphate) were synthesized. These compounds were tested as corrosion inhibitors on aluminum alloy AA6061 in diluted sulfuric acid (0.1–1 M H2SO4) by weight loss tests, polarization resistance measurements and inductively coupled plasma optical emission spectroscopy. Langmuir’s isotherms suggested film formation on bare alloy while standard free energy indicated inhibition by a physisorption process. However, compound efficiencies as inhibitors ranked low (PImC12 > PImC8 > PImC4) to reach 61% for PImC12 in highly diluted acidic solution. Apparently, the high mobility of sulfates favored their adsorption in comparison to PILs. The surface film displayed general corrosion, and pitting occurred as a consequence of PILs’ partial inhibition along with a continuous dissolution of defective patchy film on formation. A slight improvement in efficiency was displayed by compounds having high molecular weight and a long alkyl chain, as a consequence of steric hindrance and PIL interactions.

Sinapis Alba Extract as Green Corrosion Inhibitor for Aluminum in Alkaline Media

Sinapis Alba Extract as Green Corrosion Inhibitor for Aluminum in Alkaline Media

Hydroxypropyl methylcellulose as a polymeric corrosion inhibitor for aluminium

Purpose– The paper aims to investigate the effectiveness of hydroxypropyl methylcellulose (HPMC) as corrosion inhibitor for aluminium in 0.5 M H2SO4solution.Design/methodology/approach– This study was carried out using weight loss and electrochemical techniques. Inhibition efficiency was determined by comparing the corrosion rates in the absence and presence of inhibitor system. Quantum chemical computations were performed using density functional theory to assess the parameters responsible for the inhibition process and also to analyse the local reactivity of the molecule.Findings– HPMC inhibited aluminium corrosion in the acidic environment. The inhibition efficiency was found to depend on concentration of the inhibitor. Impedance results reveal that HPMC is adsorbed on the corroding metal surface. Polarization results show that the dissolution reaction is due to destabilization of the passive oxide film on the Al surface. Adsorption of the inhibitor is approximated by Freundlich adsorption isotherm and the calculated standard free energy of adsorption indicates weak physical interaction between the inhibitor molecules and aluminium surface. This can be attributed to preferential interaction of the active sites with the passive oxide layer. The calculated quantum chemical parameters show good correlation with the inhibition efficiency.Practical implications– HPMC could find possible application as a polymeric thickener and additive to improve corrosion resistance and barrier properties of anticorrosion paints.Originality/value– This paper provides novel information on the inhibitive characteristics of HPMC under the stated conditions. The inhibitor systems provide an effective means for suppressing aluminium corrosion even in highly aggressive acidic environments.

Corrosion inhibition of aluminum in 0.5 M HCl solutions containing phenyl sulfonylacetophenoneazo derivatives

The inhibition effect of some phenyl sulfonylacetophenoneazo derivatives (PSAAD) on the corrosion of Al in 0.5 M HCl solutions was studied by potentiodynamic polarization, electrochemical impedance spectroscopy, and electrochemical frequency modulation. The results obtained showed that the addition of the PSAAD inhibits the hydrochloric acid corrosion of Al. Potentiodynamic polarization measurements showed that the PSAAD act as mixed type inhibitors but predominately act as cathodic inhibitors. The inhibition efficiency increases with increasing the PSAAD concentration, but decreases with increasing temperature. A kinetic model and the Langmuir adsorption isotherm fit the experimental data well. A good correlation was found between the theoretical data and the experimental results.

English

English

Inhibition of Corrosion of Aluminium in Naoh Solution by Leave Extract of Mesembryanthemum Nodiflorum

Corrosion inhibition of aluminum in 1M NaOH solution by Mesembryanthemum nodiflorum leaves extract was investigated using the weight loss technique. A plant extract solution of 14 g/L at 50 o C was found to inhibit the corrosion of aluminum with an inhibition efficiency of 95.1%. The inhibition efficiency was found to increase with increasing the concentration of the plant extract at 50 o C. Different adsorption isotherms, Langmuir and Temkin, were tested to investigate the nature of adsorption.

The Use of Glutamic Acid as Corrosion Inhibitor for Aluminium in Hcl Solution

The adsorptive and inhibitive action of glutamic acid towards general and pitting corrosion of aluminium in HCl solution was investigated using weight loss, gasometric and thermometric methods. Glutamic acid was found to inhibit the corrosion of aluminium in HCl solution. The inhibition efficiency of glutamic acid decreased with increase in temperature, period of immersion and HCl concentration, but increased with increasing glutamic acid concentration. Adsorption characteristics of glutamic acid have also been studied and it was found that the process obeys physical adsorption. Thermodynamic parameters including; Ea, Qads, ∆Sads, ∆Hads and ∆Gads for the adsorption process signifies a spontaneous process. While Langmuir, Frumkin, Flory- Huggins and El-Awardy isotherm adsorption models can be used to explain the mechanism of glutamic acid adsorption onto aluminium surface in HCl solution.

Cashew Nut Testa Tannin: Assessing its Effects on the Corrosion of Aluminium in HCl

Cashew nut testa tannin [CASTAN] has been found to inhibit the corrosion of aluminium in hydrochloric acid solutions using gravimetric, thermometric and UV/visible spectrophotometric techniques. CASTAN inhibition was by adsorption on aluminium following Temkin isotherm in 0.1 M HCl and Langmuir isotherm in 0.5 M and 2.0 M HCl at 303 Kelvin. Physical adsorption on aluminium has been proposed in studied HCl solutions; therefore, CASTAN is a cathodic inhibitor. Earlier reports [1] showed CASTAN to contain quercetin, azaleatin, catechin, epicatechin, cyanidin and delphinidin. However, UV/visible spectrophotometric analysis of CASTAN in ethanol reveals quercetin as its major component. This work therefore investigated the correlation between computed molecular parameters and inhibitive properties of CASTAN and adsorption sites on its components. Calculated quantum chemical parameters namely: E HOMO (highest occupied molecular orbital energy), E LUMO (lowest unoccupied molecular orbital energy), energy gap ( �E) and dipole moment ( μ ) suggest that CASTAN is a soft inhibitor and it’s components inhibited aluminium corrosion in protonated forms. Calculated Mulliken charges implicated some electron rich sites, namely: the aromatic and conjugated C=C, C=O and O-H as adsorption sites on the inhibitor molecules. Proposed kinetic model reveals complex reaction mechanism, parallel reactions, for aluminium corrosion inhibition by CASTAN.

Synergistic corrosion inhibition of aluminum by polyethylene glycol and ciprofloxacin in acidic media

The synergistic inhibition of the corrosion of aluminum in acidic medium by polyethylene glycol (PEG) and the antibiotic ciprofloxacin was investigated. Significant increase in the inhibition of the corrosion of aluminum was observed by the addition of ciprofloxacin than by PEG alone. It was found that ciprofloxacin increase the inhibition efficiency of PEG from 61 to 91%. The addition of ciprofloxacin increases the kinetic thermodynamic parameters of the corrosion of aluminum such as the free energy of activation, the enthalpy of activation, and the entropy of activation which is consistent with observed increase in the inhibition efficiency. The higher absolute indicates that the adsorption of PEG on the surface of aluminum is more spontaneous in the presence of ciprofloxacin. The scanning electron microscope (SEM) images of aluminum surface before and after the exposure to HCl reveals the mechanism of the inhibition. The SEM images show that the decrease in corrosion is due to the formation of well-ordered and smooth layer of PEG and ciprofloxacin on the surface of aluminum. Langmuir isotherm was found to fit properly the adsorption of PEG and ciprofloxacin over the aluminum surface. The observed synergy is attributed to a stronger binding of PEG to the surface of aluminum mediated by ciprofloxacin.

Corrosion inhibition of Aluminum in 1 M phosphoric acid solutions using some Chalcones derivatives and synergistic action with halide ions

The purpose of this paper is to investigate the inhibition effect of some Chalcone derivatives on the corrosion behavior of aluminum in 1 M phosphoric acid solutions with and without Chalcone derivatives and to investigate the influence of halide additives namely: KCl, KBr and KI on the inhibition efficiency of aluminum. For this purpose, polarization (DC) and weight loss measurements were used. To increase the inhibition efficiency, halide anions were added to the corrosive medium. The effect of temperature also was studied over the range 30 to 50°C. Thermodynamic parameters (ΔH*, ΔS*) were calculated and discussed. The results indicated that the corrosion of aluminum was affected by the addition of Chalcone derivatives in 1 M H3PO4. The efficiency of Chalcone derivatives increases with the increase in the derivatives concentration but decreases with a rise in temperature. The effect of addition of halide ions to the corrosive solution increases the inhibition efficiency by more than 30%. These compounds were adsorbed on aluminum surface obeying Freundlich adsorption isotherm and they behave as mixed type inhibitors. The main objectives of this study were to gain some insight into the protection of aluminum in 1 M H3PO4 medium using some Chalcone derivatives. Key words: Corrosion inhibition, aluminum, synergistic effect, H3PO4, Chalcone derivatives.

Corrosion Inhibition of Aluminum–Silicon Alloy in 1 M HCl Solution Using Phenazone and Aminophenazone

The inhibiting effect of phenazone and aminophenazone towards the corrosion of aluminum–silicon alloy in 1 M HCl was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy techniques. The results of these techniques showed that, the inhibition efficiency of these compounds depends on both their concentrations and chemical structures. Investigated organic molecules inhibit the corrosion process by the adsorption on alloy surface. The adsorption process was found to obey Temkin adsorption isotherm. The effect of the temperature on the rate of corrosion in the absence and presence of inhibitors was studied. Some activated thermodynamic parameters were computed and discussed. Potentiodynamic polarization data indicated that these inhibitors act as mixed type inhibitors. Also from impedance data it is found that the corrosion of aluminum–silicon alloy is controlled by charge transfer process at all concentrations of inhibitors. Quantum chemical parameters were constructed in order to characterize the inhibition performance of the tested molecules.