Green corrosion inhibition and adsorption characteristics of leaf extract on mild steel in hydrochloric acid environment (original) (raw)
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Heliyon, 2020
The corrosion inhibition of Luffa cylindrica Leaf Extract (LCLE) was investigated using gravimetric, depth of attack and surface analysis techniques. Effect of inhibitor concentrations (0.50-1.00 g/l), temperatures (30-60 C) and immersion time (4-12 h) was studied on the Inhibition Efficiency (IE) of the extract on Mild Steel (MS) immersed in a 0.5 M HCl solution. The constituents of the proposed inhibitor were identified by using a GC-MS. The media solutions and adsorbed film on MS were characterized using FTIR Spectrophotometer. SEM microgram and surface tester were applied for studying surface morphology and depth of attack profile. The optimum IE of 87.89% was obtained. The LCLE adsorption on MS followed Langmuir isotherm and pseudo-second-order adsorption kinetics. Activation energy (28.71 kJ/mol), entropy (-0.15 kJ/mol. K), average enthalpy (-28.00 kJ/mol) and Gibbs free energy (-11.43 kJ/mol) obtained at optimum condition indicate exothermic process and physical adsorption mechanism. The result obtained in this study compared well with many reported green inhibitors for MS corrosion.
atmsp.whut.edu.cn
The inhibition of the corrosion of mild steel in hydrochloric acid solution by the fruits extract of Shahjan (Moringa oleifera), Pipali (Piper longum) and Orange (Citrus aurantium) has been studied using weight loss, electrochemical impedance spectroscopy, potentiodynamic polarization and linear polarization techniques. Inhibition was found to increase with increasing concentration of the extract. The effect of temperature, immersion time and acid concentration on the corrosion behavior of mild steel in 1 M HCl with addition of extract was also studied. The adsorption of the extract on the mild steel surface obeyed the Langmuir adsorption isotherm. Values of inhibition efficiency calculated from weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) are in good agreement. Polarization curves showed that fruits extract behaves as a mixed-type inhibitor in hydrochloric acid. The activation energy as well as other thermodynamic parameters for the inhibition process was calculated. The adsorbed film on mild steel surface containing fruits extract was also measured by Fourier transform infrared spectroscopy (FTIR). The results obtained showed that the fruits extract could serve as effective inhibitor of the corrosion of mild steel in hydrochloric acid media.
2014
The effects of aqueous extract of Gummara of the Phoenix Dactylifera (AEGPD) and aqueous extract of Lactuca (AEL) on the corrosion inhibition of mild steel in 1M HCl solution were investigated by weight loss measurements at temperature range (30 – 60 ̊ C). Results obtained showed that the percentage inhibition increases with the increasing of inhibitors concentration and decreases with the increasing of temperature. At a concentration of 2 g/L, the percentage inhibition reached about (93.82% and 95.81%) at 30 ̊ C for (AEGPD) and (AEL); respectively. The thermodynamic functions of dissolution, activation energy and adsorption processes were calculated and discussed. Adsorption of the two inhibitors was found to follow the Langmuirs adsorption isotherm.
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2022
Inhibition of corrosion of mild steel in hydrochloric acid by natural plant leaves extract of of Bahunia Varigata (Aapta), Azadirachta Indica (Neem), Pongamia Pinnata (Karanj), Santalum Album (Sandal Wood) and Astonia Scholaris (Saptparni) has studied using weight loss measurement. It was, found that the leaves extract act as a good corrosion inhibitor for mild steel in all concentrations of the extract. The inhibition action depends on the concentration of the leaves extract in the acid solution. Results for weight loss measurements indicate that inhibition efficiency increase with increasing inhibitor concentration. Extract of natural plants is one of the most important metallic corrosion inhibitors. They are readily available, nontoxic, environmentally friendly, biodegradable, highly efficient, and renewable. Several organic compounds with heteroatom such as N, O, S and P present in the plant extracts are, adsorbed directly onto the metals surface through polar atoms and thereby forming the protective layer. Plants represent a class of interesting source of compounds currently being, explored for use in metal corrosion protection in most systems, as possible replacement of toxic synthetic inhibitors. This paper discusses the different types of natural green plant leaves extract inhibitors for corrosion control of mild steel in acid medium.
FUDMA JOURNAL OF SCIENCES, 2021
The corrosion inhibition potential of lannea acida (LA) ethanol leaves extract was investigated using mild steel in 1.0 M HCl solution. The leaves extract was characterized using FT- IR Spectroscopy. The surface analysis of the mild steel was also studied using scanning electron microscopy. The study was carried out at an ambient temperature and selected high temperatures. The LA leaves extract concentration ranges from 0.1- 0.9g/L. The data obtained from weight loss measurements show that the leaves extract repressed the corrosion rate of mild steel. The increase in temperature with a corresponding increase or decrease in the inhibitor efficiency of LA leaves extract shows that the adsorption mechanism obeyed comprehensive adsorption. The value of activation energies (Ea) obtained which ranged from 15.32 to 17.63 kJ mol-1 agrees with the physical adsorption mechanism. The values of enthalpy of activation (ΔH*) obtained were positive and ranged from 38.29 to 59.00 KJ mol-1 is an ind...
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2022
Leaf extract of green inhibitor (commonly known as Borrachero or Morning Glory) is found to be efficacious on corrosion of mild steel in mixed acid solution in paste form using traditional weight loss measurements techniques. For different solution concentrations in the form of paste at various temperatures, corrosion inhibition efficiency of Borrachero leaf extracts was assessed with the help of weight loss measurements. For comparison, date of rust dissolution in liquid state has also been furnished. Different temperature conditions were appraised for the sake of overall inhibitor efficiency. From the results, Borrachero leaves have a good potential, at certain range of temperature, as eco-friendly, green, corrosion inhibitor.
2018
The inhibitive action of Costus speciosus (Crep ginger) and Lawsonia alba (Henna) on mild steel corrosion in 1 M HCl solution was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. Surface analysis such as scanning electron microscope (SEM), Atomic Force Microscopy (AFM) techniques confirmed the formation of protective layer on mild steel surface in the presence of plants extract. Results obtained showed that these investigated compounds are functioned as good inhibitors for mild steel corrosion in 1 M HCl solution. Polarization data revealed that the plants extract act as mixed type inhibitors .The inhibition efficiencies increase with increasing inhibitor concentration. The results obtained from different tested techniques were in good agreement.
Corrosion inhibition of mild steel by Laurus nobilis leaves extract as green inhibitor
Research on Chemical Intermediates, 2011
The work deals with studying the corrosion inhibition of structural steel in acidic medium (0.1M HCl) using barley grass extract as inhibitor. The effect of the concentration of inhibitor (432-768) ppm, time (15.3-176.7) h, and temperature (24-44)°C on corrosion rate, inhibition efficiency and degree of surface coverage of the metal alloy was investigated using Response Surface Methodology (RSM). Fitting of degree of surface coverage with Freundlich adsorption isotherm was conducted. The kinetics parameters of corrosion and inhibition processes including the activation energy and frequency factor were estimated as well as the thermodynamic parameters including the standard free energy of adsorption Δ G°ads, the entropy of activation (ΔS*) and enthalpy of activation (ΔH*). The corrosion rate was found to increase with increasing time and temperature, while the inhibition efficiency was found to increase with increasing the inhibitor concentration and decrease with time and temperature. The RSM analysis results revealed that maximum corrosion rate of about 2.11 mg/h resulted at 42°C and 164 h without using inhibitor compared to 0.26 mg/h at 43°C and 72 h with using the green inhibitor respectively. The value and the negative sign of ΔG°ads indicated that the inhibitor molecules adsorbed spontaneously onto the metal surface via physiosorption. The positive shift of enthalpy of activation in presence of inhibitor reflected that the process of adsorption of the inhibitor on the alloy surface is an endothermic process and the negative values of entropy of activation represented association rather than dissociation of the inhibitor indicating the decrease of system disorder due the adsorption process. According to the estimated results, barely grass extract could be recommended as low cost green inhibitor for acid corrosion inhibition of structural steel used in manufacturing industrial equipment and vessels.
Tobacco Plant Extracts as Save Corrosion Inhibitor for Carbon Steel in Hydrochloric Acid Solutions
The inhibitive action of the aqueous extract of tobacco towards the corrosion of C-steel in HCl solution was investigated. The inhibition efficiency was measured using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. The surface morphology of carbon steel was also studied. It was found that the addition of the extract reduces the corrosion rate of C-steel and hence increases the inhibition efficiency. The inhibitive effect of the tested extract was discussed in view of adsorption of its components on the steel surface. The adsorption of the extract components on the C-steel surface follows Langmuir adsorption isotherm. The thermodynamic functions of dissolution and adsorption processes were calculated and discussed. The inhibition efficiency increases as the temperature is increased. The presence of extract decreases the activation energy of the corrosion process.