Silybum Marianum oil as green inhibitor for carbon steel corrosion in 1 M HCl solution : Electrochemical and SEM investigations (original) (raw)
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Transactions of the Indian Institute of Metals, 2014
The aim of this work was to investigate the inhibition effect of acid garlic essential oil (GO oil) as an inhibitor on the corrosion of carbon steel in a 1M HCl solution at different temperatures by weight loss, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization methods. The GO oil acts as an effective corrosion inhibitor for carbon steel in a hydrochloric acid medium. The inhibition process is attributed to the formation of an adsorbed film of inhibitor on the metal surface which protects the metal against corrosion. The result indicates that the inhibition efficiency) increases as with the concentration of the inhibitor. The (%IE of GO oil depends on its concentration, and attains approximately 95.8% for 2.5 g/L at 298K. The effect of temperature on the corrosion behavior of carbon steel in 1 M HCl, with the addition of essential oil was also studied. The adsorption of the essential oil on the carbon steel surface obeyed the Langmuir adsorption isotherm. Values of inhibition efficiency calculated from weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy are in good agreement. Polarization curves showed that GO oil behaves as a mixed-type inhibitor. The activation energy as well as other thermodynamic parameters for the inhibition process was calculated and discussed. The results obtained showed that the acid garlic essential oil could serve as an effective inhibitor of the corrosion of carbon steel in hydrochloric acid solutions.
Investigation of some oleochemicals as green inhibitors on mild steel corrosion in sulfuric acid
Journal of Applied Electrochemistry, 2009
The inhibitive effect of four oleo chemicals (namely; 2-Pentadecyl-1,3-imidazoline (PDI), 2-Undecyl-1,3-imidazoline (UDI), 2-Heptadecyl-1,3-imidazoline (HDI), 2-Nonyl-1,3-imidazoline (NI)), regarded as green inhibitors, were studied for the corrosion protection of mild steel in 0.5 M H2SO4. The methods employed were weight loss, potentiodynamic polarization and electrochemical impedance techniques. Scanning electron microscopy (SEM) was carried out on the inhibited and uninhibited metal samples to characterize the surface. The purity of synthesized inhibitors was checked by FT-IR and NMR studies. The inhibition efficiency increased with increase in inhibitor concentration, immersion time and decreased with increase in solution temperature. No significant change in IE values was observed with increase in acid concentration. The best performance was obtained for UDI possessing 96.2% inhibition efficiency at 500 ppm concentration. The adsorption of the compounds on the mild steel surface in the presence of sulfuric acid obeyed Langmuir’s adsorption isotherm. The values obtained for free energy of adsorption and heats of adsorption suggest physical adsorption. The addition of inhibitor decreased the entropy of activation suggesting that the inhibitors are more orderly arranged along the mild steel surface. The potentiodynamic polarization data indicate mixed control. The electrochemical impedance study further confirms the formation of a protective layer on the mild steel surface through the inhibitor adsorption.
Quarterly Journal of Applied Chemical Research, 2015
The corrosion inhibition of ST37 Carbon Steel in 1.0 M HCl by aquatic extract of coconut has been studied as a possible source of green inhibitor using the potentiodynamic polarization and electrochemical impedance spectroscopy techniques. The aquatic extract of coconut have many advantages over classical techniques of sample preparation of plant gums (such as drying and solvent reflux).Polarization measurements showed that the extracts act as mixed typed inhibitor but under cathodic control. The passivation layer formed on metal surface, and then inhibits the anodic dissolution of steel. The compounds that available in coconut oil provides a good protection to steel against corrosion by shifting the potential at the noble direction. The Nyquist plots showed that on increasing CW concentration, increases charge transfer resistance and decreases double layer capacitance. The Results obtained from Tafel extrapolation and EIS techniques were in good agreement. SEM studies also help to ...
Corrosion Inhibition of Carbon Steel in 1M HCl Solution Using Sesbania Sesban Extract
Aquatic Science and Technology, 2013
Corrosion inhibition effect of Sesbania sesban extract (SSE) on the carbon steel in 1M HCl solution was investigated by potentiodynamic polarization and weight loss techniques. The corrosion rate of carbon steel was decreased in the presence of SSE. The corrosion inhibition efficiency was found to increase with SSE concentration to attain 91.08% with 2.00 g/l at 25. The polarization studies showed that SSE acts as mixed type inhibitor. The effect of temperature, acid concentration and immersion time on the corrosion rate of carbon steel in HCl solution in the absences and presence of SSE was also studied. Values of corrosion inhibition efficiency calculated from weight loss technique were in good agreement with those obtained from potentiodynamic polarization test. The results showed that the adsorption of the extract on the carbon steel surface obeys Langmuir isotherm. The activation parameters, apparent activation energy (E a , the enthalpy of activation (ΔH a) and entropy of activation (ΔS a) for the corrosion of carbon steel in 1M HCl in the absence and presence of SSE were calculated and discussed.
International Journal of Corrosion and Scale Inhibition, 2020
Corrosion scientist/engineers are showing great research interest in developing green corrosion inhibitors of plant origin. It has been reported that plant extracts possess good inhibitive characteristics, with little or no negative impact on the environment. In this work, accurate identification of the Cupressus arizonica leaves essential oil (CAEO) was obtained by hydrodistillation. Gas chromatography-mass spectrophotometer (GCMS) was used to identify its chemical constitution, which indicated the presence of 21.27%, 19.88%, 9.39%, 5.84% and 4.76% of сis-muurola-4(14),5-diene, terpin-4-ol, α-Pinene, -cadinene and epi-α-muurolol, respectively. The corrosion inhibition properties of CAEO for carbon steel (CS) in 1.0 M HCl were evaluated using weight loss measurements, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). Results revealed that Cupressus arizonica leaves essential oil (CAEO) has an excellent inhibiting effect on the CS in 1.0 M HCl solution. The protection efficiency increases with increasing inhibitor concentration to attain 95% at 500 ppm. Potentiodynamic polarization studies revealed that CAEO acts primarily as a mixedtype inhibitor. The effect of temperature on the corrosion inhibition properties indicated a decrease in the inhibition efficiency from 92% (298 K) to 72% (328 K). Electrochemical impedance spectroscopy measurements showed that adsorbed molecules of CAEO formed a protective film on the carbon steel surface in 1.0 M HCl.
Corrosion Protection of Carbon Steel in Acidic Solution by Using Ylang-Ylang Oil as Green Inhibitor
2015
The inhibition effect of ylang-ylang oil (YYO) and their adsorption on carbon steel surface in hydrochloric acid was realized at temperatures varying between 308 and 338 K by weight loss, EIS, and potentiodynamic polarization techniques. The tested compound showed inhibition efficiency that is superior 87 % for a concentration equal to 1.0 g/L. Polarization measurements indicate that the examined oil act as a mixed inhibitor with predominant anodic effectiveness and the protection efficiency increases with inhibitor concentration but this effect decreased with increasing of temperature. Data obtained from EIS studies were analyzed to model inhibition process through appropriate equivalent circuit models. The adsorption of YYO on carbon steel surface obeys Langmuir adsorption isotherm in acid medium and the activation were determined and discussed.
2016
The inhibiting effect of essential oil of Carum Carvi (Carum.C) on the corrosion of carbon steel in 1M HCl solution has been investigated by different techniques such as weight loss, potentiodynamic polarization and electrochemical impedance (EIS) methods at different concentrations of inhibitor ranging from 0,6 to 3 g/L. Essential oil from Carum Carvi was obtained by Clevenger-type water distillation. The essential oil was identified by gas chromatography-mass Spectrometry (GC and GC/MS). The major compounds identified are: Carvone (67.3 %) and Limonene (28.8 %). The results of polarization show that the inhibition efficiency increases with increasing the Carum.C oil concentration to attain a maximum value of 92 % at 3 g/L. The Nyquist plots showed also that increasing oil concentration, charge-transfer resistance increased and double-layer capacitance decreased, involving increased inhibition efficiency. The study of the effect of the temperature (303 343 K) on the behavior of the...
Study of anti-corrosion activity of Algerian L. stoechas oil on C38 carbon steel in 1 M HCl medium
International Journal of Industrial Chemistry
The current study was designed to give more knowledge and helping to exploit the leaves of the plants L. stoechas collected in Tlemcen region in the west of Algeria by determining the anti-corrosive activity of its essential oil. The inhibitory efficiency of the essential oil of the plant obtained by hydrodistillation and characterized by GC and GC/MS was studied using gravimetric and electrochemical methods (polarization curves and electrochemical impedance). The effect of temperature on the corrosion behavior of the steel and the inhibitory efficiency was studied in a temperature range of 303-323 K at 2 g/L. The surface morphology of the samples immersed in 1 M HCl for 24 h, before and after adding inhibitor at (2 g/L at 30 °C) was analyzed by scanning electron microscope (SEM) Quanta 250 with tungsten filament from the company FEI. Results show that the addition of the essential oil of the plant to the medium induces a diminish in the rate of corrosion and augmentation in the inhibitory efficiency of the oil. We established that the inhibition efficiency increase with concentration of the essential oil of lavender to attain 76.19% at 2 g/L. Polarization curves revealed that lavender oil react as a mixed-type inhibitor. EIS spectra exhibit one capacitive loop and confirm the inhibitive ability, and the changes in impedance parameters were indicative of adsorption of essential oil of lavender on the metal surface. The thermodynamic parameters indicate that the adsorption of the molecules of the oil takes place according to the Langmuir isotherm in the corrosive medium studied and that they are physisorbed on the metal surface. The analysis of the surface by electron microscopy demonstrates the absence of surface attack patterns in the presence of the oil. The results obtained from different tested techniques were in good agreement.
Comparative study on corrosion effect of two essential oils on the mild steel in 1M HCl acid medium
Journal of Chemical Technology and Metallurgy, 2023
In this paper, we compared the corrosion inhibiting effect of two essential oils on mild steel in 1 M HCl. The essential oils are extracted from natural plants harvested in Morocco and prepared through distillation. To carry out this work, we used gravimetric and electrochemical methods, including current-potential plots and impedance spectroscopy. The results obtained show that both essential oils are a good corrosion inhibitor and that the inhibition efficiency of wormwood essential oil reaches a value of more than 80 % at 298 K. To learn the fundamentals of how inhibitors interact with metal surfaces, wormwood essential oil adsorption on a mild steel surface was also investigated. The Langmuir isotherm model is revealed to be how the essential oils adsorb on the metal surface. The effect of temperature on the performance of mild steel in 1 M HCl with wormwood essential oil was examined in the temperature range of 313 to 353 K. Additionally, calculations and discussions are made to provide some thermodynamic data for the adsorption processes. This work enters the framework for the use of non-toxic products in green chemistry.
Biointerface Research in Applied Chemistry, 2021
The aim of the present work is to investigate the inhibitory effect of the aerial part of Daucus carota L essential oil (EO) on mild steel in a 1.0M HCl solution. The electrochemical study is performed using potentiodynamic polarization (PDP) curves, and electrochemical impedance spectroscopy (EIS) measurements in the presence of various concentrations of the examined Daucus carota L essential oil (EO). PDP results show that the studied EO behaved as a mixed-type inhibitor. EIS measurements indicated that the EO could inhibit the corrosion of mild steel by the formation of a protective film on the surface of mild steel. The experimental results showed an efficiency of 96.5% for a concentration of 2 g/l. In addition, The DFT results proved that the major components, especially -pinene (23.5%), -Bisabolene (3.96%), and Pseudo limonene (7.20%) having a high electron-accepting ability and interact actively with the iron surface, which may be responsible for the inhibition ability of t...