Khaoula Nasr, Michele Fedel, Khaled Essalah, Flavio Deflorian and Nebil Souissi
This study aims to investigate the inhibition performance of an aqueous extract of Matricaria recutita chamomile on the corrosion of S235JR steel in 0.5 M NaCl by using…
Abstract
Purpose
This study aims to investigate the inhibition performance of an aqueous extract of Matricaria recutita chamomile on the corrosion of S235JR steel in 0.5 M NaCl by using electrochemical impedance spectroscopy (EIS) and polarization measurements.
Design/methodology/approach
The inhibition performance was investigated using EIS and polarization measurements. Surface analysis demonstrates the presence of a protective layer on the steel surface in the presence of the extract. Quantum chemical parameters calculated for the molecules contained in the aqueous extract are interpreted to predict the corrosion inhibition efficiency of the considered extract.
Findings
The inhibition efficiency of chamomile aqueous extract for S235JR steel increases with increasing amounts of plant concentration and with an increase in the immersion time. The optimal inhibition efficiency of chamomile extract, 98.90 per cent, was achieved for S235JR steel when immersed in 15 per cent v/v of extract concentration for 2 h. The surface analysis in the absence and presence of the chamomile extract confirmed the formation of a protective layer on steel surface. The quantum chemical calculations allowed to explain the great inhibition efficiency values by interpreting the calculated quantum parameters.
Originality/value
This is the first study carrying out an experimental and theoretical investigation on M. recutita chamomile as a green corrosion inhibitor, with interesting potential industrial applications.
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The purpose of this paper is to study the inhibitive and adsorptive characteristics of ethanol extract of Heinsia crinata for the corrosion of mild steel in H2SO4 solutions.
Abstract
Purpose
The purpose of this paper is to study the inhibitive and adsorptive characteristics of ethanol extract of Heinsia crinata for the corrosion of mild steel in H2SO4 solutions.
Design/methodology/approach
The inhibition efficiencies were evaluated using weight loss, thermometric and hydrogen evolution techniques while adsorption properties were studied using IR spectroscopy.
Findings
The inhibition efficiency of ethanol extract of Heinsia crinata varies with concentration of the extract, period of immersion and with temperature. The extract acts as an adsorption inhibitor because of its phytochemical composition. The extract is adsorbed spontaneously on the surface of mild steel according to Temkin and Frumkin adsorption isotherms. The mechanism of physical adsorption is proposed from the trend of the inhibition efficiency with temperature and the values of some kinetic and thermodynamic parameters obtained.
Research limitations/implications
The paper provides information on the use of ethanol extract of Heinsia crinata as a corrosion inhibitor. Electrochemical studies such as polarisation and AC impedance spectra will throw more light on the mechanistic aspects of the corrosion inhibition.
Practical implications
Ethanol extract of Heinsia crinata can be used as an environmentally friendly inhibitor for the corrosion of mild steel in H2SO4. This environmentally friendly inhibitor could find possible applications in metal surface anodising and surface coatings.
Originality/value
The paper provides information on an environmentally‐friendly corrosion inhibitor.
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The purpose of this paper is to study the inhibitive and adsorption characteristics of ethanol extract of Garcinia kola and Cola nitida for the corrosion of mild steel in H2SO4…
Abstract
Purpose
The purpose of this paper is to study the inhibitive and adsorption characteristics of ethanol extract of Garcinia kola and Cola nitida for the corrosion of mild steel in H2SO4 solutions.
Design/methodology/approach
The inhibition efficiencies were evaluated using weight loss and thermometric methods while the adsorption properties were studied using IR spectroscopy.
Findings
The inhibition efficiencies of ethanol extracts of Garcinia kola and Cola nitida were comparable and vary with concentration of the extract, period of immersion and with temperature. The extracts act as adsorption inhibitors because of its phytochemical composition. The extracts are adsorbed spontaneously on the surface of mild steel according to Langmuir adsorption isotherms. The mechanism of physical adsorption is proposed from the trend of the inhibition efficiency with temperature and the values of activation energy and some thermodynamic parameters obtained.
Research limitations/implications
The study provides information on the use of ethanol extract of Garcinia kola and Cola nitida as corrosion inhibitors for mild steel. Electrochemical studies such as polarisation and AC impedance spectra will illuminate the mechanistic aspects of the extract.
Practical implications
Ethanol extract of Garcinia kola and Cola nitida are environmentally friendly inhibitors for the corrosion of mild steel in H2SO4.
Originality/value
These environmentally friendly inhibitors may find possible applications in metal surface anodising and surface coatings.
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Chigoziri N. Njoku, Temple Uzoma Maduoma, Wilfred Emori, Rita Emmanuel Odey, Beshel M. Unimke, Emmanuel Yakubu, Cyril C. Anorondu, Daniel I. Udunwa, Onyinyechi C. Njoku and Kechinyere B. Oyoh
Corrosion is a major concern for many industries that use metals as structural or functional materials, and the use of corrosion inhibitors is a widely accepted strategy to…
Abstract
Purpose
Corrosion is a major concern for many industries that use metals as structural or functional materials, and the use of corrosion inhibitors is a widely accepted strategy to protect metals from deterioration in corrosive environments. Moreover, the toxic nature, non-biodegradability and price of most conventional corrosion inhibitors have encouraged the application of greener and more sustainable options, with natural and synthetic drugs being major actors. Hence, this paper aims to stress the capability of natural and synthetic drugs as manageable and sustainable, environmentally friendly solutions to the problem of metal corrosion.
Design/methodology/approach
In this review, the recent developments in the use of natural and synthetic drugs as corrosion inhibitors are explored in detail to highlight the key advancements and drawbacks towards the advantageous utilization of drugs as corrosion inhibitors.
Findings
Corrosion is a critical issue in numerous modern applications, and conventional strategies of corrosion inhibition include the use of toxic and environmentally harmful chemicals. As greener alternatives, natural compounds like plant extracts, essential oils and biopolymers, as well as synthetic drugs, are highlighted in this review. In addition, the advantages and disadvantages of these compounds, as well as their effectiveness in preventing corrosion, are discussed in the review.
Originality/value
This survey stresses on the most recent abilities of natural and synthetic drugs as viable and sustainable, environmentally friendly solutions to the problem of metal corrosion, thus expanding the general knowledge of green corrosion inhibitors.
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Kumar P.E., Govindaraju M. and Sivakumar V.
The purpose of this paper is to study the corrosion inhibition performance of an eco-friendly drug clozapine on the corrosion of copper in 1.0 M nitric acid and 0.5 M sulfuric…
Abstract
Purpose
The purpose of this paper is to study the corrosion inhibition performance of an eco-friendly drug clozapine on the corrosion of copper in 1.0 M nitric acid and 0.5 M sulfuric acid solutions.
Design/methodology/approach
The corrosion inhibition nature of inhibitor molecule was evaluated by weight loss, electrochemical impedance spectroscopy and potentiodynamic polarization studies. An attempt was made to correlate the molecular properties of neutral and protonated forms of inhibitor molecule using quantum chemical calculations. The effect of temperature on the corrosion inhibition efficiency was also studied using electrochemical impedance spectroscopy. The potential of zero charge was determined to explain the mechanism of corrosion inhibition.
Findings
The studies on corrosion inhibition performance of clozapine showed that it has good corrosion inhibition efficiency on the corrosion of copper in 1.0 M nitric acid and 0.5 M sulfuric acid solutions. The adsorption of clozapine molecules onto the copper surface obeyed the Langmuir adsorption isotherm. The value of free energy of adsorption calculated is very close to −40 kJmol−1, indicating that the adsorption is through electrostatic coulombic attraction and chemisorption. The decrease in the value of energy of activation with the addition of inhibitor also shows the chemisorption of the inhibitor on the metal surface. The potential of zero charge and quantum chemical studies confirmed that the protonated molecules also get involved in the corrosion inhibition process through physisorption.
Originality/value
The present work indicates that clozapine can act as a good corrosion inhibitor for the corrosion of copper in acid media.
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The purpose of this paper is to study the effect of concentration of H2SO4 on the corrosion of mild steel and to investigate the inhibitive properties of Aloe vera for mild steel…
Abstract
Purpose
The purpose of this paper is to study the effect of concentration of H2SO4 on the corrosion of mild steel and to investigate the inhibitive properties of Aloe vera for mild steel corrosion. The study also seeks to investigate the possibility of using Aloe vera as a green corrosion inhibitor for mild steel.
Design/methodology/approach
Gasometric (Hydrogen evolution) and thermometric methods of corrosion monitoring have been adopted for the study. The study was conducted at 303 and 333 K and the concentrations of inhibitor used were 0.1, 0.2, 0.3 and 0.4 g/L. The inhibitor was prepared by using alcohol extract of moisture free samples of Aloe vera. The functional groups present in the extract have been determined using infra red spectrophotometer. Thermodynamic and adsorption theories have been used to interpret the data.
Findings
Ethanol extract of Aloe vera is a good inhibitor for mild steel corrosion at 303 and 333 K. The inhibitor acts by chemical adsorption isotherm. Functional groups identified in the extract are found to played dominant role in the adsorptive and inhibitive potentials of this extract. Values of inhibition efficiency obtained from gasometric and thermometric analysis were comparable.
Research limitations/implications
Further study on synergism with the view of enhancing the inhibition efficiency of Aloe vera extract and the used of other analytical methods may reveals a wealth of information on the possibilities of transforming this research for field application.
Originality/value
The paper provides information on the use of Aloe vera as a green corrosion inhibitor. It has not been published elsewhere.
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N.O. Eddy and E.E. Ebenso
The purpose of this paper is to study the inhibitive and adsorptive characteristics of ethanol extract of Gongronema latifolium (GL) as a corrosion inhibitor for mild steel in H2SO…
Abstract
Purpose
The purpose of this paper is to study the inhibitive and adsorptive characteristics of ethanol extract of Gongronema latifolium (GL) as a corrosion inhibitor for mild steel in H2SO4.
Design/methodology/approach
The inhibition efficiencies were evaluated using thermometric and hydrogen evolution techniques.
Findings
The inhibition efficiency of ethanol extract of GL vary with concentration of the extract, period of immersion and with temperature. The extract acts as an inhibitor because of its phytochemical and amino acid composition. The extract is adsorbed spontaneously on the surface of mild steel according to Langmuir adsorption isotherm. The mechanism of physical adsorption is proposed from the trend of the inhibition efficiency with temperature and the values of some kinetic and thermodynamic parameters obtained.
Research limitations/implications
The study provides information on the use of ethanol extract of GL as a corrosion inhibitor. Electrochemical studies such as polarisation and alternating current impedance spectra will throw more light on the mechanistic aspects of the corrosion inhibition.
Practical implications
Ethanol extract of GL can be used as an environmentally friendly inhibitor for the corrosion of mild steel in H2SO4.
Originality/value
This environmentally friendly inhibitor could find possible applications in metal surface anodising and surface coatings.
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Anthony Ikechukwu Obike, Wilfred Emori, Hitler Louis, Godwin Ifeanyi Ogbuehi, Paul Chukwuleke Okonkwo and Victoria Mfon Bassey
The purpose of this paper is to study the adsorption properties of a proven traditional medicine of West Africa origin, Alstonia boonei with an attempt to evaluate its application…
Abstract
Purpose
The purpose of this paper is to study the adsorption properties of a proven traditional medicine of West Africa origin, Alstonia boonei with an attempt to evaluate its application in the corrosion protection of mild steel in 5 M H2SO4 and 5 M HCl.
Design/methodology/approach
Phytochemical screening and Fourier transform infrared spectroscopy analysis were used to characterize the methanolic extract of the plant. Gravimetry, gasometry and electrochemical techniques were used in the corrosion inhibition studies of the extract and computational studies were used to describe the electronic and adsorption properties of eugenol, the most abundant phytochemical in Alstonia boonei.
Findings
The extract acted as a mixed-type inhibitor in both acidic solutions, with improved inhibition efficiency achieved with increasing concentration. While the efficiency increased with temperature for the HCl system, it decreased for the H2SO4 system. The mechanism of adsorption proposed for Alstonia boonei was chemisorption in the HCl system and physisorption in the H2SO4 system, and the adsorptions obeyed Langmuir isotherm at low temperatures. Computational parameters showed that eugenol, being a representative of Alstonia boonei, possesses excellent adsorption properties and has the potential to compete with other established plant-based corrosion inhibitors.
Research limitations/implications
As opposed to pure compounds with distinctive corrosion effects, plant extracts are generally composed of a myriad of phytoconstituents that competitively promote or inhibit the corrosion process and their net effect is evident as inhibition efficiencies. This is, therefore, the main research limitation associated with the corrosion inhibition study of Alstonia boonei.
Originality/value
Being very rich in antioxidant properties by its proven curative and preventive effects for diseases, the interest was stimulated towards the attractive results that abound from its corrosion protection of metals via its anti-oxidation route.
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Uchenna Luvia Ezeamaku, Innocent Eze, Nkiru Odimegwu, Angela Nwakaudu, Amarachukwu Okafor, Okechukwu Dominic Onukwuli and Ikechukwu Abuchi Nnanwube
The purpose of this study is to investigate starch mucor (SM) in potassium iodide (KI) as corrosion inhibitor of aluminium in hydrochloric acid (HCl) medium.
Abstract
Purpose
The purpose of this study is to investigate starch mucor (SM) in potassium iodide (KI) as corrosion inhibitor of aluminium in hydrochloric acid (HCl) medium.
Design/methodology/approach
The SM in KI was characterized by gravimetric, scanning electron microscopy, electrochemical impedance spectroscopy measurements, potentiodynamic polarization and gas chromatography-mass spectrometer techniques. The inhibition efficiency was optimized using response surface methodology.
Findings
The result revealed that the inhibitor inhibited corrosion at a low concentration with the rate of inhibition increasing as the concentration of the inhibitor increased. The inhibition efficiency increases as the temperature was increased with slight incorporation of the inhibitor (SM in KI). This indicates that the corrosion control is both inhibitor (SM in KI) and temperature dependent.
Originality/value
The research results can provide the basis for using SM in KI as corrosion inhibitor of aluminium in HCL medium. Mixed-type inhibitor nature of SM was proved by cathodic and anodic nature of the polarization curves.
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Aziz Boutouil, My Rachid Laamari, Ilham Elazhary, Hafid Anane, Abdeslem Ben Tama and Salah-Eddine Stiriba
This study aims to investigate the inhibition effect of a newly synthesized1,2,3-triazole containing a carbohydrate and imidazole substituents, namely…
Abstract
Purpose
This study aims to investigate the inhibition effect of a newly synthesized1,2,3-triazole containing a carbohydrate and imidazole substituents, namely, 1-((1-((2,2,7,7-tetramethyltetrahydro-5H-bis([1,3]dioxolo)[4,5-b:4′,5′-d]pyran-5-yl)methyl)-1H-1,2,3-triazol-4-yl)methyl)-1H-benzo[d]imidazole (TTB) on the corrosion of mild steel in aerated 1 M H2SO4.
Design/methodology/approach
The authors have used weight loss measurement, potentiodynamic polarization, electrochemical impedance spectroscopy, FT-IR studies, scanning electron microscopy analysis and energy dispersive X-ray (EDX) spectroscopy techniques.
Findings
It is found that, in the working range of 298-328 K, the inhibition efficiency of TTB increases with increasing concentration to attain the highest value (92 per cent) at 2.5 × 10−3 M. Both chemisorption and physisorption of TTB take place on the mild steel, resulting in the formation of an inhibiting film. Computational methods point to the imidazole and phenyl ring as the main structural parts responsible of adsorption by electron-donating to the steel surface, while the triazol ring is responsible for the electron accepting. Such strong donating–accepting interactions lead to higher inhibition efficiency of TTB in the aqueous working system.
Originality/value
This work is original with the aim of finding new acid corrosion inhibitors.