Aluminium In Acidic Medium Research Articles

Anticorrosion Behavior of Persea macrantha Leaf Extract on Aluminium in Acidic Medium

Anticorrosion Behavior of Persea macrantha Leaf Extract on Aluminium in Acidic Medium

Response surface methodology and experimental evaluation of the inhibitory properties of corn leaf extract for aluminum corrosion in acid media

PurposeThis study aims to develop eco-friendly corrosion inhibitors for aluminum in acidic media by evaluating the corrosion inhibition properties of corn leaf extract (CLE) using response surface methodology (RSM) and experiments.Design/methodology/approachThe RSM was combined with experiments to evaluate the corrosion inhibition properties of CLE on aluminum in acid media.FindingsThe effectiveness of the inhibition increased with increasing inhibitor concentration and time but decreased with increasing temperature. The corrosion inhibition mechanism revealed the corrosion process is spontaneous exothermic physical adsorption. Thermodynamic parameters revealed an activation energy between 32.1 and 24.7 kJ/mol, energy of adsorption between −14.53 and −65.07 and Gibbs free energy of −10.12 kJ/mol which indicated the CLE exothermically spontaneously physisorbed. A model was generated to estimate the effect of the process parameters (inhibitor concentration, reaction time and temperature) using the RSM. Optimization of the process factors was also carried out using the RSM. The percentage inhibition efficiency obtained experimentally (85.61%) was closely comparable to 84.89% obtained by the theoretical technique (RSM). The SEM observations of the inhibited and uninhibited Al samples demonstrated that CLE is an effective corrosion inhibitor for aluminum in acid media.Originality/valueResults herein provide novel information on the possible application of CLEs as effective eco-friendly corrosion inhibitors.

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.

Corrosion Inhibition of Mild Steel and Aluminum in Hydrochloric Acid Solutions by Gum Exudates from Erythrophleum Africanum

The corrosion inhibition potentials of gum exudates extracted from Erthrophleum Africanum on mild steel and aluminium in acidic media were studied using gravimetric, Fourier transform infrared (FTIR) and scanning electron microscopy (SEM) and potentiodynamic methods. The results range for gravimetric showed (30.30-80.0 %) and potentiodynamic polarization (66.50-86.74 %) which shows that the inhibition efficiency of the inhibitor increases with increase in concentration of gum exudate but decreases with increasing temperature. The addition of the gum exudate affects both the cathodic and anodic partial reaction, thereby reducing the cathodic and anodic current densities and the corresponding corrosion densities, which makes the gum act as a mixed type of inhibitor. The inhibitor was found to be an adsorption inhibitor that best fits the Temkim adsorption model; because the data have high degrees of linearity and the parameters were positive. The activation energy values ranges from 10 - 20 J/mol which indicates that the adsorption of the inhibitors favors the mechanism of physical adsorption, free energy of absorption ranges from -10.51 to -11.69 J/mol which indicate that the reaction is spontaneous and it’s an exothermic reaction. FTIR spectra of the inhibitors and the corrosion products of mild steel and Aluminum (in the presence of the inhibitors) revealed that there were shifts in frequencies of adsorption (821,925,1620,1730,1990) suggesting that some functional groups were used in adsorption and some new bonds were formed. (CH Rocking, = CH ‘oop’, C=O symmetric stretch) Examinations of the morphology of the mild steel and Aluminum (using SEM) before and after inhibition revealed the formation of protective coverage over the surface of the metal

An overview of sustainable green inhibitors for aluminum in acid media

<abstract> <p>Metal corrosion is a significant and growing area of study in industrial problems, which has found productive research ground in the field of green chemistry. In the last 10 years, green chemistry has been highlighting the importance of safeguarding human as well as the environmental well-being, in an economically advantageous way aiming at keeping away from reducing waste hazardous toxins, and pollutants. The era of metal degradation, commonly faced due to the usage of hazardous chemicals became very relevant and useful in the research area of chemistry. Even though several experiments have been conducted and, several research articles were published on this topic of nature-friendly green and clean inhibitors still there are yet a lot of things to be explored in this field for sustainable eco-friendly existence of human and natural interconnected existence. The main aim of the study is to provide a summary and describe the past authentic research that accounted in the research literature to employ eco-friendly corrosion inhibitors, especially extraction from leaves, stems, seeds, and fruits of the plants for aluminum alloy in acid solutions in the past decade. Weight loss and electrochemical approaches are among the most often utilized methods to measure corrosion rate and to evaluate the effectiveness of green corrosion inhibitors. The relevance of the area prompted the further study, leading to a large number of substances being evaluated.</p> </abstract>

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.

Anticorrosive properties of Spiramycin for aluminum in acidic medium

Anticorrosive properties of Spiramycin for aluminum in acidic medium

Corrosion Inhibiting Effect of Cetyl Pyridinium Chloride on Aluminium in Acid Media in Presence of KI

Corrosion Inhibiting Effect of Cetyl Pyridinium Chloride on Aluminium in Acid Media in Presence of KI

Corrosion Inhibitive Action and Adsorption Behaviour of Justicia Secunda Leaves Extract as an Eco‐Friendly Inhibitor for Aluminium in Acidic Media

The extract of Justicia secunda (JS) leaves was investigated as an eco‐friendly corrosion inhibitor of aluminum in 0.5 M HCl using weight loss, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), and scanning electron microscopy (SEM) techniques. The inhibitor concentrations used ranged from 50 to 250 ppm at 30, 40, and 50oC. Results show that Justicia secunda acts as a good inhibitor for aluminum. Its efficiency increased with increasing inhibitor concentration but decreased with increasing temperature. Maximum inhibition efficiency as high as 94.3% was found at 30°C for 250 ppm of the inhibitor with the weight loss technique. Tafel polarization results show that the extract acts as a mixed-type inhibitor. The Nyquist plots indicated decreasing double-layer capacitance and increasing charge transfer resistance on increasing JS concentration. The inhibition action occurred through the physical adsorption of the extract on the aluminum surface. The adsorption process was found to follow Langmuir adsorption isotherm. The formation of a protective film on the metal surface was confirmed by scanning electron microscopy.

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

Inhibitory effect of new azole derivative in the corrosion of aluminum in acidic medium: common electrochemical and electrochemical noise investigation

Inhibitory effect of new azole derivative in the corrosion of aluminum in acidic medium: common electrochemical and electrochemical noise investigation

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.

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.

CORROSION PROTECTION OF MILD STEEL AND ALUMINIUM IN 0.1M AND 1M HCL ACID SOLUTIONS USING PTEROCARPUS OSUN.

The inhibition effect of Pterocarpus osun on the corrosion of mild steel and aluminium in acidic medium was studied using gravimetric techniques. Weight loss measurements were determined on metal coupons in 0.1M and 1M HCl acid within the immersion time of 24-h for 5 consecutive days. Inhibition efficiency was determined by comparing the corrosion rates of mild steel and aluminium in 0.1M and 1M HCl in the presence and absence of additives. The trend of inhibition efficiency was used to propose the mechanism of inhibition. It was found that the plant extract act as inhibitor for acid-induced corrosion of mild steel and aluminium in 0.1M and 1M HCl. Inhibition efficiency of 94.5% and 94.9% were obtained for P. osun for aluminium in 0.1M and 1M HCl and 98.9%and 96.9% for mild steel in 0.1M and 1M HCl respectively. The inhibition efficiency was found to increase with increase in inhibitor concentrations. The adsorption of the inhibitor obeyed Langmuir Adsorption Isotherm. Based on the findings, P. osun stem extract is highly recommended as an alternative to synthetic, toxic chemical inhibitors.

Optimum prediction for inhibition efficiency of Sapium ellipticum leaf extract as corrosion inhibitor of aluminum alloy (AA3003) in hydrochloric acid solution using electrochemical impedance spectroscopy and response surface methodology

Statistical optimization was used to optimize corrosion inhibition efficiency of Sapium ellipticum leaf extract as corrosion inhibitor of aluminum in acid medium. Response surface methodology was applied, and the effects of four independent variables; acid concentration, inhibitor concentration, temperature, time, and their expected responses were determined. Central composite design a statistical tool was used to generate a total of 16 individual experimental runs, which was previously design to study the effects of these variables during corrosion process. The uniqueness of the model was scrutinized with various criteria including coefficient of determination (R2 = 0.987), p value (< 0.0001), adequate precision (30.22) and coefficient of variation (5.30). The RSM is well fitted in the model which adequately predicted the optimum inhibition efficiency of 96.73% at optimum inhibitor concentration of 1.5g/L-1, acid concentration 1 M, temperature of 303 K and time of 6 hours. Also the electrochemical concept signifies that Sapium ellipticum acts as a mixed-kind inhibitor. The experimental data obtained is in conformity with other research works.
 
 Bull. Chem. Soc. Ethiop. 2020, 34(1), 175-191.
 DOI: https://dx.doi.org/10.4314/bcse.v34i1.17

Shatavari (Asparagus Racemosus) as Green Corrosion Inhibitor of Aluminium in Acidic Medium

Shatavari (Asparagus Racemosus) as Green Corrosion Inhibitor of Aluminium in Acidic Medium

Inhibition Effect of Phthalocyaninatocopper(II) and 4-Tetranitro(phthalocyaninato)copper(II) Inhibitors for Protection of Aluminium in Acidic Media

Inhibition Effect of Phthalocyaninatocopper(II) and 4-Tetranitro(phthalocyaninato)copper(II) Inhibitors for Protection of Aluminium in Acidic Media

Electrochemical Behavior and Computational Analysis of Phenylephrine for Corrosion Inhibition of Aluminum in Acidic Medium

The anticorrosion property of phenylephrine on aluminum in 0.5 M HCl is successfully reported for the first time. The experimental techniques employed included weight loss, polarization, electrochemical impedance spectroscopy (EIS), and computational methods. The results show that the addition/adsorption/application of phenylephrine on the metal surface leads to significant reduction in its corrosion rate (CR). It was found that phenylephrine shows the maximum of 97 pct inhibition at 4000 ppm at 298 K. The results from potentiodynamic polarization revealed that phenylephrine acts as a mixed type of inhibitor. The mode of adsorption of the inhibitor on the aluminum surface followed Langmuir adsorption isotherm. Quantum chemical calculations and molecular dynamic (MD) simulations were adopted to elucidate the inhibition mechanism of the inhibitor on the surface of the metal. Surface analysis was done using scanning electron microscopy (SEM) and atomic force microscopy (AFM) studies.

Use of Sapindus (reetha) as corrosion inhibitor of aluminium in acidic medium

The inhibitive performance of Sapindus on the acidic corrosion of Aluminium was studied using myriad experimental and computational techniques. Sapindus showed 98% of inhibition efficiency at 2000 ppm. Inhibition efficiency of Sapindus was found to be directly proportional to its concentration in the acidic medium. Effect of temperature was also studied and it played a corrosive role by increasing the corrosion rate and decreasing the inhibition efficiency of Sapindus. Thermodynamic parameters of adsorption were derived to enunciate the findings. Mechanism of adsorption was also explored using electrochemical impedance spectroscopy and potentiodynamic polarization (Tafel) studies which displayed a profound physisorption mechanism.

Kinetics of corrosion inhibition of aluminum in acidic media by water-soluble natural polymeric chondroitin-4-sulfate as anionic polyelectrolyte inhibitor

Corrosion inhibition of aluminum (Al) in hydrochloric acid by anionic polyelectrolyte chondroitin-4-sulfate (CS) polysaccharide has been studied using both gasometrical and weight-loss techniques. The results drawn from these two techniques are comparable and exhibit negligible differences. The inhibition efficiency was found to increase with increasing the inhibitor concentration and decreased with increasing temperature. The inhibition action of CS on Al metal surface was found to obey both of Langmuir and Freundlich isotherms. The factors affecting the corrosion rates such as the concentration and geometrical structure of the inhibitor, concentration of the corrosive medium, and the temperature were examined. The kinetic parameters were evaluated and a suitable corrosion mechanism consistent with the results obtained is discussed.