Table 5 - uploaded by Raghavendra Narasimha
Content may be subject to copyright.
Source publication
The aluminium corrosion inhibition behaviour in the presence of Areca palm leaves (AL) extract in hydrochloric acid (0.5 M) medium was examined by chemical (mass loss), AC impedance spectroscopy, potentiodynamic polarization and surface (scanning electron microscopy) methods. Aluminium protection rates increased with an increase in the amount of AL...
Contexts in source publication
Context 1
... the present investigation, the surface coverage and inhibitor concentration values are fitted well to Langmuir adsorption model (Fig. 3). The various thermodynamic parame- ters obtained from this plot are shown in Table 5. The equilibrium constant of the inhibitor adsorption (K ads ) values increase with increasing solution temperature from 303 K to 323 K. ...
Context 2
... the present investigation, the surface coverage and inhibitor concentration values are fitted well to Langmuir adsorption model (Fig. 3). The various thermodynamic parame- ters obtained from this plot are shown in Table 5. The equilibrium constant of the inhibitor adsorption (K ads ) values increase with increasing solution temperature from 303 K to 323 K. ...
Similar publications
The effect of acetic acid on CO2-H2S corrosion of carbon steel was investigated at elevated temperatures in both CO2 and H2S dominated systems using electrochemical and non-electrochemical methods. The results acquired from potentiodynamic polarization illustrated that the corrosion rate initially increases with the concentration of acetic acid and...
Citations
... The different surface analysis tests were also done on the steel substrate in order to examine the surface morphology (shape, size, texture) of each specimen in the presence and absence of green corrosion inhibitor. The list of diverse tests on surface analysis carried out by researchers are: scanning electron microscope (SEM) [72,[83][84][85][86][87], Atomic Force Microscopy (AFM) [72,73,88,89], X-ray diffraction analysis (XRD) [86,90], Energy dispersive spectroscopy (EDS) [91], Optical Microscopy [92], Raman spectroscopy [87], Energy dispersive X-ray analysis (EDX) [84,93], Contact angle measurement [72], Grazing Incidence X-ray Diffraction (GIXRD), Transmission electron microscope (TEM) [94], Trinocular metallurgical microscopy [70], X-ray photoelectron spectroscopy (XPS) and Electron probe micro-analyser (EPMA) [95]. From the above-mentioned surface analysis tests, the most commonly performed tests are SEM and AFM. ...
Reinforced cement concrete (RCC) is a versatile material that deteriorates over time due to corrosion when exposed to any surrounding aggressive environment. In order to avoid this ramification, many researchers have carried out different work to find the most feasible way to reduce corrosion. To tackle this at the initial stage itself, one such convenient method is through the application of inhibitors. These inhibitors have most applications in their use as an admixture. This review paper mainly focuses on the inhibitor and its types, the drawbacks of inorganic, commercial organic, and hybrid inhibitors, and application to RCC, and also provides detailed information on green corrosion inhibitors (GCI). In recent years, widespread attention has been paid towards the utilization of different natural plant components/parts in concrete structures. This review paper consolidates the work done by various researchers using different GCIs with the main focus on plant extracts as an additive to concrete or RCC specimens which will be significant to sustainable progress in the field of corrosion.
https://www.mdpi.com/2075-5309/12/10/1682
... The protection rates of Al enhanced with increased concentration of extract and decreased with an increase in contact time and temperature. According to the results of potentiodynamic polarization, gravitational tests, and SEM, it acted as a potential green CI with an efficiency of 89.493%, 88.114% and 97.035%, respectively [186]. In other studies, the leaf extract of Stachytarpheta indica was utilized to study the corrosion rate of Al in acidic solutions at different temperatures. ...
Corrosion costs more than a trillion dollars worldwide and with great efforts being made
to solve this problem. The toxic effect of components used in the solution of this problem
causes new problems with increasing environmental concerns and high costs.
Accordingly, green inhibitors have become an alternative protection method with its
ecofriendly nature. With the development of green chemistry technologies, the role of
plant extracts and biowastes as new corrosion inhibitors in various environments and
their protection effect for many materials have been determined. In this study, besides
these mentioned topics, test methods, corrosion prevention mechanisms, and economic
approaches are summarized.
... The protection rates of Al enhanced with increased concentration of extract and decreased with an increase in contact time and temperature. According to the results of potentiodynamic polarization, gravitational tests, and SEM, it acted as a potential green CI with an efficiency of 89.493%, 88.114% and 97.035%, respectively [186]. In other studies, the leaf extract of Stachytarpheta indica was utilized to study the corrosion rate of Al in acidic solutions at different temperatures. ...
... Plants products are inexpensive, renewable and readily available. Some of the plant organic compounds have been reported to function as effective inhibitors of metal in different aggressive environments [3][4][5][6][7][8]. The choice of an appropriate inhibitor for a particular application is restricted by a number of factors [9]. ...
This work is on optimization and impedance study of inhibition efficiency of moringa leaf extract as corrosion inhibitor of aluminum in alkaline solution. Gravimetric method, polarization study and impedance measurement was employed in the corrosion inhibition study. Response surface methodology (RSM) was applied in the optimization process. Central composite design tool of design expert software version 9 was used to evaluate the effects and interactions of four variables of acid concentration (AC), inhibitor concentration (IC), temperature (T) and time (t) on the inhibition efficiency of the extract. Analysis of variance (ANOVA) was used to study the data generated. Moringa leaf extract exhibited optimum inhibition efficiency of 96.65 % at optimum inhibitor concentration of 1.5 g/L-1. The electrochemical impedance spectra revealed that moringa leaf extract acted as a mixed-type inhibitor. The extract is highly efficient in surface treatment of aluminum in alkaline environment.
... Because of increasing ecological awareness and stricter regulations on the environmental protection in relation to the usage and utilization of man-made corrosion inhibitors, the search for environment-friendly alternatives, the socalled green corrosion inhibitors, has started. Green corrosion inhibitors include natural plant-based products [1,2] and nontoxic man-made compounds such as, dyes [3e5], rare earth elements [6,7], Schiff bases [8e10] and medicines [11,12], which have been classified as environmentally friendly. ...
Various bee products were found to be efficient corrosion inhibitors of aluminium in different environments. In particular, bee pollen was found to be highly effective in alkaline electrolytes, yet its highly complex composition and possible synergistic interactions hinder determination of the compounds acting as active corrosion inhibitors. The main purpose of the following work is to investigate the effect of solvents used for pollen extraction process on the corrosion inhibition of AA5754 alloy in alkaline environment. Both infrared and mass spectroscopies as well as chromatographic analysis were used to determine differences in the composition of each obtained extract.The inhibition efficiency (IE%) of each extract was determined by using the potentiodynamic polarization and impedance studies. The highest IE%, exceeding 90% at 10 gL^-1, was recorded for the water/ethanol extract. Most importantly, it has been found that the dichloromethane extract containing less polar compounds enhanced the corrosion rate at low bee pollen concentrations, and offered lower inhibition efficiency at the concentrations above 10 gL^-1. The adsorption isotherms were drawn based on dynamic impedance spectroscopy in galvanostatic mode (g-DEIS), while the measurements carried out at elevated temperatures allowed the construction of Arrhenius plots and, consequently, the confirmation of the physical mechanism of adsorption.
This study advanced the establishment of natural plant-based inhibitors for corrosion prevention procedures. It entails modelling the efficiency of leaf extract for mild steel corrosion control in HCl solution. The mango leaf extract are characterize to ascertain its molecules/molecular structures using gas chromatography-mass spectrophotometer (GCMS). The efficiency undergo modeling using response surface methodology (RSM) and artificial neural network (ANN). Critical phenomena of the inhibitor’s bio-molecules in the HCl solution and interfacial transition between the molecules and mild steel’s surface are examine using Langmuir, Frumkin, Temkin and Flory-Huggins adsorption isotherms. The results showed that 2-hydroxycyclopentadecanone (C15H28O2), 4-hepten-3-one (C8H14O), benzenemethanol (C9H12O), and 2,7-dimethyloct-7-en-5-yn-4-yl ester (C14H20O4 are the predominant molecular constituents (of higher inhibitive properties) in the mango leaf extract. The highest efficiency of 91.42% is obtain at an inhibition concentration of 0.6 g/L, temperature of 318 K and immersion time of 16 hours. Efficiency of the extract are model by optimization tools of RSM and ANN. Based on statistical analyses (correlation coefficient, RMSE and standard error of prediction), ANN performed better than RSM in the prediction of inhibition efficiency of the extract. Interfacial transition between the extract’s molecules and the mild steel surface established. The bio-molecular constituents inhibited the corrosion by process of adsorption.
Environment-friendly materials (e.g., Honey and Mint) are used as corrosion inhibitors for aluminum in hydrochloric acid (HCl) using both the density functional theory (DFT) at the B3LYP/6–31G* basis set level and semi-empirical methods (AM1, PM3, MINDO, and RM1). The aim of this study is to investigate the inhibition efficiency (%IE) in terms of their molecular structure. The quantum chemical parameters such as the highest occupied molecular orbital energy (EHOMO), the lowest unoccupied molecular orbital energy (ELUMO), the energy gap (ΔE), the charge on the reactive core, the hardness (η), and the total energy have all been computed. The MINDO method was used to measure the electronic energies and charge densities of the inhibitors that were used. Theoretical calculations were also carried out, with the findings correlating well with the experimental data. Gravimetry and gasometry measurements were used to investigate the effects of honey and mint on aluminum corrosion in a 1.0 M hydrochloric acid (HCl) solution. In acid solutions, honey and mint were found to be effective inhibitors of aluminum corrosion, with honey being the better option. Because of the adsorption of its components on aluminum surfaces, the inhibitory effect of the used inhibitors was addressed. The higher dipole moment of honey than that of mint caused the adsorption of honey on the aluminum surface better. The IEs measured by gravimetry and gasometry are almost identical
The definition, classification, properties, chemical composition and uses of plant extracts were reported in this review article. Corrosion of metals and alloys influences infrastructures, buildings, industrial economy, modern and old ancient works. Protection of metals and alloys against corrosion can be achieved by using different methods such as cathodic protection, environmental control, anticorrosion coatings and adding inhibitors. Plant extracts were studied as low cost eco-friendly corrosion inhibitors. They not contain heavy metals or other toxic compounds. In addition they are biodegradable and renewable source of materials. Plant extracts were classified into inhibitors for corrosion of the following metals and alloys in different aggressive corrosion media: carbon steel, aluminium and its alloys, copper and its alloys, zinc and its alloys and nickel and its alloys. Mineral scale deposits in industrial water represent a major problem leading to unexpected shutdowns and costly chemical or cleaning actions. Control of scale formation including acidification, ion exchange softening and scale inhibitors addition. The environment concerns lead the research to develop new environmentally friendly chemicals, currently named “Green” scale inhibitors. Plant extracts are recently used as green antiscalents and classified into inhibition of crystallization of each of carbonates and sulphates. © 2020, Russian Association of Corrosion Engineers. All rights reserved.
