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Variation of In(Wf/Wo) with time for stainless steel corrosion in 0.5 M H2SO4 solution with and without ES at 298 K
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The effects of temperature on the corrosion resistance of stainless steel Type 316 in 0.5 M H2SO4 solution using waste material (egg shell powder) as inhibitor was investigated using gravimetric method. Results obtained show that rate of corrosion increases with increase in temperature and exposure time. Addition of inhibitor to the corroding solut...
Citations
... This includes coatings, use of corrosion inhibitors, and material selection. The application of inhibitors is one of the most reliable and economical techniques in combating the metallic corrosion mostly in the oil and gas sector [8][9][10]. The majority of the inhibitors reported are heterocyclic base with sulfur, nitrogen, and oxygen heteroatoms [11]. ...
... Sulfuric acid 98% Analytical grade was diluted with distilled water to prepare the simulated corrosive solution (0.5 M H 2 SO 4 ). Eggshell was procured from the Gauteng region, South Africa from which different concentration (2 to 10 g) was prepared [9,[14][15][16]. The reagents utilized in this study all had excellent analytical quality and weren't further purified before use. ...
... The gravimetrically-measured experimental inhibition efficiency of eggshell extract (EGSE) was collected from the study of Sanni et al. [9,[14][15][16]. To evaluate the corrosion rate accurately, stainless steel was immersed in 0.5 M H 2 SO 4 . ...
The study aims to employ machine learning modelling approach to model the measurement of corrosion rate on AISI 316 stainless steel when corrosion inhibitor is added in different dosages and dose schedules. To achieve this, experimental data was analyzed statistically and modeled using Levenberg-Marquardt's back-propagation artificial neural network (LMBP-ANN), and adaptive neuro-fuzzy inference system (ANFIS) algorithms. Maximum inhibition efficiencies of 96.44%, 94.74%, and 90.24% were obtained from experimental at a concentration of 10 g and temperatures of 288, 298, and 308 K respectively. The experiment shows that the corrosion rate time profile depends on the dosing schedule, whereas the final rate mainly depends on the environmental severity. The corrosion rates are predicted by the developed models while their capabilities were compared in terms of Mean Absolute Percentage Error root (MAPE), determination coefficient (R 2), Mean Absolute Deviation (MAD), and Root Mean Square Error (RMSE) for all outputs. From the statistical metrics obtained , credence was given to ANFIS as the best predictive model compared to the LMBP-ANN with MAPE, R 2 , MAD, and RMSE value of 15.242,0.893, 0.105,0.372 for corrosion rate, 13.135,0.904, 0.725,1.036, for weight loss and 18.342, 0.835, 20.417, 24.238 for inhibition efficiency at the testing stage. The effect of inhibitor concentration and exposure time are the most significant parameters for predicting eggshell extract as potential inhibitor for stainless steel in oilfield pickling and acidizing media.
... The activation energy obtained in the presence of the inhibitor was 52.1 ± 1.67 kJ, while in its absence, it was 49.0 ± 0.24 kJ. These results suggest that the N,P,S-CQDs interact with the MS surface physically through electrostatic interactions [65]. ...
In this work, an endogenous self-doping N,P,S-CQDs was synthesized by the acid hydrolysis of pumpkin seeds(Cucurbita maxima) and its performance as a corrosion inhibitor was evaluated. Mild steel (MS) is one of the mostused materials in the industry; however, it has low corrosion resistance in acidic environments. Pumpkin iscultivated worldwide, and this compositional characteristic makes pumpkin seeds a great alternative as a rawmaterial to produce CQDs. The results show that endogenous self-doping CQD was successfully obtained with asize distribution smaller than 10 nm. The N,P,S-CQDs presented 91.3% at 60 ppm and 94.6% at 10 ppm asmaximum inhibition efficiency after 2 and 24 h immersion, respectively. Activation energy studies, XPS analysis,and isotherm studies show that the inhibition mechanism occurs through physical interaction. These results showan excellent alternative for using pumpkin seeds (Cucurbita maxima), an agroindustry waste, as a corrosioninhibitor.
... KJ mol -1 , who suggested the occurrence of both physisorption and chemisorption processes, with a major contribution from the latter [33]. Moreover, the negative value shows that the adsorption process is spontaneous and the high values of K )56 (Table 3) give thought to the strong adsorption of inhibitor on metal surface [34]. ...
... Accordingly, the gravimetric measurements are carried out in 1 M HCl solution at 303-333 K for the optimum concentration of Grewia bicolor juss extract. The logarithmic form of the Arrhenius relation allows to determine graphically the activation energy Ea and ∆H " , respectively, by the following Equations [34,38]: ...
... Because the metal surface is covered with inhibitor molecules, the discharge of hydrogen ions at the metal surface is slowed, causing the system to move away from a random arrangement, increasing the entropy of activation. As a result, the entropy of activation increases (in the presence of inhibitors, the disordering from reactant to activated complex increases) [34,41]. The values of E " obtained for XC48 steel in hydrochloric acid solution containing inhibitor are greater with respect to those retrieved for the blank system. ...
The inhibitory effect of the methanol extract of Grewia bicolor juss (GB) leaves against XC48 mild steel corrosion, in hydrochloric acid solution (1M) medium, was investigated by potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) methods for different concentrations at 298 K and weight loss measurements with optimum concentration at different temperatures (298-333 K) and time immersion. The results demonstrated that the components of the extract took action mainly as a mixed-type inhibitor, and the inhibition efficiency values escalated with the progression of extract concentration. The maximum value obtained is about 93% at a concentration of 1500 ppm. This high efficiency can be attributed to the installation of a protecting blanket on the electrode surface. The adsorption of the inhibitor molecules on adsorbate surface obeyed Langmuir isotherm model. The thermodynamic parameter values suggested that physisorption and chemisorption constituted the major contribution to the process of adsorption. Results obtained from weight loss measurements show that the inhibition efficiency decreases with increasing immersion time and temperature. Finally, scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analyses confirmed obtained results, which reveal that adsorbed inhibitor molecules hinder HCl attacks at the steel grain boundaries.
... The corrosion rate, inhibition performance, and inhibitor adsorption depend on various parameters. Some of them are as follows: type and surface of the metal, structure of the used corrosion inhibitor, the type, and strength (pH) of the tested solution (corrosive medium), inhibitor concentration, immersion (contact) time, and temperature (Christov and Popova 2004;Dkhireche et al. 2020;Murthy and Vijayaragavan 2014;Sanni et al. 2019;Sharma and Kumar 2021;Verma et al. 2018b;Wang et al. 2011). ...
In this work, the corrosion inhibition of carbon steel in 1 molar HCl solution was evaluated by experimental and modeling approaches using 2-mercaptobenzimidazole (2-MBI). To this end, an experimental design for the weight loss method using response surface methodology (RSM) was carried out and the corrosion rate (CR) and inhibition efficiency (IE) were determined. The study was completed at various values of temperature, exposure time, and inhibitor concentration to determine the optimal conditions for corrosion prevention. Using experimental data on the corrosion rate and inhibition efficiency of 2-MBI, new models were developed, the significance of which was tested using ANOVA-analysis of variance. The developed RSM-based CR and IE models were highly accurate and reliable, and their P -values were less than 0.0001. The novelty of this study lies in the newly developed model for the evaluation of 2-MBI inhibition performance and its application to high-temperature conditions in the petroleum industry. Besides, the R ² -statistics ( R ² , adjusted- R ² , and predicted- R ² ), adequate precision and diagnostic plots were used as main measures to verify the accuracy and adequacy of both CR and IE models. In addition, it was observed that inhibitor concentration had the most impact on both CR and IE models compared to other parameters due to its largest F -values (561.65 for CR and 535.56 for IE models). Moreover, the results indicated that adding 140–150 ppm of 2-MBI at low-level temperatures of 30–35 °C had the most interaction effect on the performance of the corrosion inhibition process. In this case, the CR was less than 0.9 mm/y and the IE more than 94%, even after a high exposure time of 105 h. Furthermore, numerical optimization of the corrosion inhibition process for 2-MBI showed that the optimum conditions for maximum IE and minimum CR were achieved at a concentration of 115 ppm, temperature of 30.7 °C, and exposure time of 60.4 h. Under these conditions, the efficiency and corrosion rate were 92.76% and 0.53 mm/y, respectively. Finally, the adsorption of 2-MBI on the sample surface was studied at various exposure times and temperatures. In all cases, the adsorption behavior obeyed the Langmuir isotherm. In this case, the Gibbs adsorption free energy varied from − 33 to − 37 kJ/mol, which reflects both physical and chemical adsorption of the corrosion inhibitor at all tested temperatures and test times.
... This denotes that ASPE was adsorbed on the X65 steel surface cover and inhibited the corrosion ions' aggressiveness on the surface of the X65 steel. This affirmation is also in agreement with the previous studies [27]. An increase in the ASPE concentration increased the ASPEs' efficiency; this observation might be due to the increase in charge and mass transfers to the metal surface, resulting in the inhibitor molecule adsorption and reduced metal dissolution. ...
Currently, the use of synthetic inhibitors in preventing corrosion is destructive to the environment; therefore, natural inhibitors might be an alternative and innovative solution to this challenge, owing to their sustainability. Herein, wasted avocado seed extract was examined as a sustainable and green inhibitor for API 5L X65 pipeline steel at an ambient temperature using the gravimetric analysis, the potentiodynamic polarization curve, and linear polarization resistance techniques. The inhibitor’s chemical characterization was carried out with Fourier-transform infrared spectroscopy (FTIR), and the morphological characterization was carried out by detailed scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM/EDX). The result showed that the extract decreased the corrosion rate by retarding the cathodic and anodic electrochemical reactions, with a maximum efficiency of 88% at 5 g/L. The extract was adsorbed physically onto the X 65 steel following the Langmuir adsorption isotherms. The electrochemical studies showed that the agro-waste was a mixed-type inhibitor. The SEM image of the X65 steel with the extract showed thin film formation on the steel surface. The extract can be substituted for synthetic inhibitors, which are toxic, scarce, and costly.
... In an acid solution, for example, the hydroxyl groups in these molecules become polarized, causing the oxygen atoms to become electron donors. As a result, hydroxyl groups may be responsible for the metal electrostatic attraction [44,45]. When these organic molecules are adsorbed onto the metal surface, they produce protective coatings with inhibitive capabilities, according to many researchers [30][31]37,40]. ...
Weight loss, polarization, and open circuit potential methods were used to investigate the corrosion inhibitory impact of Centrosema pubescens leaf extract on 304L austenitic stainless steel UNS S30403 in 1 M hydrochloric acid. This non-toxic extract behaves as a mixed-type inhibitor according to the polarization curves, thermodynamics and activation parameters. Both the weight loss calculations and potentiodynamic polarization investigations showed that 1.2 g L-1 was the optimal concentration of the leaf extract. While the weight loss method gave inhibition efficiency of 86.84 and 75.00 % after 10 and 60 days of immersion at the optimum concentration, polarization studies revealed inhibition efficiencies of 93.08 and 98.66 % at 303 and 333 K, respectively. The extract molecules adhered to the UNS S30403 surface according to Langmuir adsorption isotherm. The presence of the protective film on the UNS S30403 surface was confirmed by SEM, EDX, and XRD measurements. The inhibition performance of the leaf extract was noted to be a function of the extract concentration, immersion time and temperature. The FTIR analysis indicated an interaction between austenitic stainless steel UNS S30403 and the molecules of Centrosema pubescens leaf extract.
... Organic inhibitors are generally adsorbed on the adsorbent surface to control the rate of deterioration of the metal by inhibiting the anodic dissolution or cathodic evolution of hydrogen or both reactions. Inhibitor adsorption process is dictated by the chemical structure of inhibitor, nature of the metal surface, interaction between organic molecules and metallic surface, and type of the corrosive electrolyte [35]. ...
Inhibiting Chloride-Induced Corrosion of AISI 304L using novel corrosion inhibitor was investigated in 1.0 M HCl solutions. Methods employed were weight loss, electrochemical and scanning electron microscopy. The research was achieved by injecting varied concentrations of the novel corrosion inhibitor into the corrosive solutions containing the adsorbent. Analysis of results showed that the injected novel inhibitor possessed commendable inhibitive features in HCl solutions. Results from both weight loss and potentiodynamic polarization measurements were in tandem. The inhibitor concentration varied linearly with the inhibition efficiency, surface coverage and resistance polarization up to some a point, but had an inverse relationship with the corrosion rate and current density. The displacement in Ecorr was calculated to be 72 mV which suggests that the extract acted as a mixed type inhibitor. Kinetic study result revealed that the inhibited samples possessed higher half-life than uninhibited species. Calculated thermodynamics and adsorption parameters revealed that the mechanism of adsorption of the adsorbate onto AISI 304L surface at 30 °C is by physisorption and agrees with Langmuir adsorption isotherm. The scanning electron microscopy showed that inhibited samples had better surface features.
... Table 4 shows that the corrosion rate of steel increases with temperature both in the absence and presence of inhibitor at a concentration of 250 ppm, but the effect is more noticeable in the blank solution, and the inhibition efficiency values decrease with increasing temperature. This decrease in inhibition efficiency when the solution temperature is raised could be attributed to an increase in the mobility of the inhibitor molecules, which reduces the interaction between the metallic surface and the effect of temperature on the inhibition performance of studied oil essential [32][33][34][35]. Where A is Arrhenius constant, E a denotes the apparent activation energy, R is the ideal gas constant, and T represents the absolute temperature. ...
The inhibition efficiency of wood sawdust essential oil of Cedrus Atlantica against mild steel corrosion in 1M HCl solution has been tested using electrochemical impedance spectroscopy (EIS) and Potentiodynamic polarization. Polarization measurements revealed cathodic-type inhibitor behavior. The inhibitory efficacy assessed by both polarization and (EIS) techniques was in typical agreement, with %IE values of 95.09 5% and 95.82 % at 250 ppm of oil essential. Based on the kinetic and thermodynamic properties K ads and G°a ds , it is concluded that WSCA oil adsorption occurs via a physisorption process and follows the Langmuir isotherm. In addition, the temperature effect was studied at (303-333 K), and the thermodynamic parameters (E a , H, S) were determined and discussed to elaborate the corrosion mechanism. The corrosion inhibition effect was discovered to be temperature and inhibitor concentration dependent.
... Although several studies demonstrate that agro-waste compounds are effective corrosion inhibitors for most metals such as copper and its alloys, carbon steel, and zinc in acid media [25][26][27][28][29][30][31][32][33] little research has been reported on agro-waste as corrosion inhibitors for AA2024-T3. Using waste materials will have a good impact on the environment and can increase the waste economy value [34]. ...
Aluminium corrosion in hydrochloric acid media is a huge challenge in the chemical industry; hence, creating green and more efficient inhibitors is an urgent task. Furthermore, the increasing amount of solid waste and its disposal consequences has been a major economic and environmental problem. Therefore, this study aims to determine the protective effect of coconut shell as a potential corrosion inhibitor for AA2024-T3 aluminium alloy in 1 M hydrochloric acid solutions using weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy techniques. The results show that the inhibition efficiency increases with an increase in the coconut shell concentration, and the maximum inhibition efficiency reaches 97.91% at 1 g/L. The potentiodynamic polarization study shows that the inhibitor acts as a mixed-type corrosion inhibitor. The adsorption of the inhibitor obeyed the Langmuir adsorption isotherm. The surface characterization confirmed the presence of barrier layers covering the aluminum surface. The mechanical properties were also determined and discussed. As compared to the wide range of reported corrosion inhibitors in the literature, the coconut shell has shown to be highly effective for AA2024-T3aluminium alloy. Therefore, it can be suggested that coconut shell waste is a potential corrosion inhibitor for AA2024-T3aluminium alloy in the chemical industry.
... There also exist agricultural waste materials that are utilized as reinforcement to parent materials for various applications. Examples, among others, are coconut shells, for lightweight construction products, and eggshells, used as reinforcement in aluminium alloy [12,13]. At the same time, oil beanstalk is being recently employed as an additive to building ceilings [14]. ...
The emission of harmful elements from burning building ceiling materials and their attendant health effects on inhabitants within the vicinity of the emitted harmful elements is increasingly becoming a source of concern globally. Hence, the need to develop eco-friendly flame-retardant composite materials suitable for house ceiling purposes to forestall unwanted toxic emissions. This work identified the chemical structure of developed composite products and their emission performance during combustion. X-ray Diffraction (XRD) analysis was used for phase quantification and E550 combustion gas analyzer for emission characterization of the developed composites. Thermolyne 950 °C oven was employed for the combustion analysis of the prepared composite at 500 °C. Quasi negligible SO2 and CO2 levels existed, while A4, 0.3Aldr0.23Cmt0.3Si0.05G0.12CS recorded maximum CO level, indicating toxic affluence. The low mass losses of all composite materials, especially for A2, 0.6Aldr0.34Cmt0.05G0.01OBSretard significantly due to its activities by the retardant constituent. The flame retardant nature of all produced composites was evidenced in their elemental composition. There was an absence of a flammable element and stable insulating compounds providing retardance to flame occurrences. These suppressions in flame inclination of the reinforced materials were noticed within the boundaries of the ceiling crystals from the structural examination. The intermetallic phase from the diffraction intensities showed the presence of a significant second bond interstitial solid-phase across the matrix, especially for 0.6Aldr0.34Cmt0.05G0.01OBS ceiling material. This study has established the eco-friendliness of developed building ceiling composite and the potential to reduce the importation of building ceilings. The developed ceiling composite evidently demonstrated high potential to compete favourably with imported ceiling materials in terms of fire resistance performance, low cost of production, and abundant availability of raw materials in the environment. Oil beanstalk is a novel material introduced as a reinforcement to developed building ceiling composite. This research provides a blueprint for manufacturers, construction and allied industry, and stakeholders in developing eco-friendly flame retardant composite ceilings whose materials can be readily sourced locally available in the environment.
