Watermelon waste products as green corrosion inhibitors for mild steel in HCl solution (original) (raw)
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Utilization of watermelon rind extract as a green corrosion inhibitor for mild steel in acidic media
Journal of Industrial and Engineering Chemistry, 2014
Electrochemical techniques were used to investigate the efficacy of watermelon rind extract (WMRE) as corrosion inhibitor for mild steel in HCl and H 2 SO 4 solutions. The inhibition efficiency increased as the concentration of the extract increases. Potentiodynamic polarization results indicate that WMRE act as a mixed-type inhibitor. The values of effective capacitance obtained by utilizing the impedance parameters in both acidic media are in the range of double layer capacitance. Corrosion inhibition effect of WMRE can be attributed to the adsorption of constituents of WMRE onto the mild steel surface which can be approximated by Temkin adsorption isotherm model.
The corrosion inhibition of mild steel in 2M hydrochloric acid solution by Melon (Cucumismelo)(MPE) and Groundnut (Arachishypohaea) peel extracts (GPE) at room temperature has been investigated using weight loss method. Inhibition efficiencies of 94.40% and 92.64% for2M HCl concentration was observed for GPE and MPE respectively. Generally, the weight loss of the coupons decreases at different concentrations of HCl solutions while the inhibition efficiencies of the inhibitors (MPE and GPE) increased with increasing inhibitor concentrations.
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.
Watermelon Peel Extract as Green Corrosion Inhibitor for ST-37 Carbon Steel in Seawater
International Journal of Innovation in Mechanical Engineering and Advanced Materials
Corrosion engineering has taken great interest in many industries that required high cost management to overcome the serious problems. This work has investigated the role of watermelon peel extract as green inhibitor to protect carbon steel in seawater. This investigation has studied the corrosion rate and inhibition efficiency applying weight loss method. The laboratory result shows the optimum inhibition efficiency found to be 71.64% at 5% inhibitor concentration in 100 ml seawater at room temperature. The effects of temperature and immersion time on inhibition efficiency have also been examined. This study has used Arrhenius equation based on activation energy to determine type of adsorption encountered with corrosion process. The result shows a chemical adsorption justified by its high adsorption heat and strengthened by FTIR and UV-Vis examinations. The phytochemical examination of watermelon peel extract gives positive response to flavonoid, alkaloid, and saponin. The findin...
Journal of the Taiwan Institute of Chemical Engineers, 2015
The contribution of l-citrulline (CTL) to the corrosion inhibition effect of aqueous rind extract (RE) from watermelon for mild steel in HCl solution was investigated using electrochemical (electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP)) and weight loss techniques at 25°C and 60°C. Results obtained show that both CTL and RE inhibited acid-induced corrosion of mild steel. Inhibition efficiency increased with increase in concentration reaching the maximum value of 46.30% and 90.20% respectively at the highest concentration (1000 ppm) studied from weight loss measurements. Inhibition efficiency was also observed to decrease with increase in solution temperature. l-citrulline was found to be responsible for about 51.33% to the overall inhibition efficiency of RE. Polarization studies indicate that both l-citrulline and RE function as mixed-type corrosion inhibitors. The corrosion inhibition effect of l-citrulline and RE is assumed to occur by physisorption of l-citrulline and components of RE on the mild steel surface which can be approximated by Temkin adsorption isotherm model.
Combating A36 mild steel corrosion in 1 M H2SO4 medium using watermelon seed oil inhibitor
2021
Corrosion inhibitive performance of the extracted watermelon seed oil on A36 mild steel in 1 M H2SO4 medium, at 305 and 319 K corrosion reaction temperatures, was investigated. Weight loss and inhibition efficiency were determined using gravimetric method while corrosion rate and inhibitoion efficiency were evaluated using potentiodynamic tests. Gravimetric tests showed that watermelon seed oil inhibitor attained a better corrosion inhibition efficiency of 50% at the operating temperature of 305 K compared to an efficiency of 48% obtained at the operating temperature of 319 K. Electrochemical potentiodynamic polarization tests showed that 3 vol/vol% inhibitor concentration gave the most promising corrosion inhibiting results at the operating temperature of 305 K, while 4 vol/vol% inhibitor concentration gave the most reliable corrosion resisting one at the operating temperature of 319 K. Langmuir adsorption isotherm correctly predicted the adsorption behaviour of the watermelon seed...
2018
API 5L X65 carbon steel is used in many industries, especially as oil and gas pipelines. However, this carbon steel pipe is vulnerable to corrosion at the inner surface owing to the flow of oil that is a multiphase system and contains dissolved salts. The corrosion phenomenon of the internal surface can be prevented by using an inhibitor. Most of the inhibitors used in industry are composed of compounds that are toxic and environmentally unfriendly. Consequently, the use of a natural inhibitor is at the forefront of corrosion inhibition studies. This study examines the efficiency of watermelon seed extract as an inhibitor before and after the addition of methyl ethyl glycol (MEG). The influence of L-citrulline from watermelon seed extract (WMSE) and MEG on the inhibition of corrosion of carbon steel in 3% NaCl containing acetic acid saturated by CO 2 at room temperature was investigated by the immersion test, polarization test, electrochemical impedance spectroscopy (EIS), and surfa...
We are reporting green capsicum annuum fruit extract as inhibitor for mild steel corrosion in acid solution. Inhibition potential of this aqueous fruit extract has been determined with the help of weight loss method and electrochemical techniques. Results obtained by various techniques are close to each other and maximum efficiency of 85 % is acknowledged at the inhibitor concentration of 1400 mgl -1 . Langmuir isotherm model is found most suitable to explain adsorption behavior of inhibitor for mild steel surface. Molecular adsorption of inhibitor over mild steel surface is found responsible for corrosion inhibition of mild steel in acid which is also supported by OEM studies.
The Use of Green Leafy Vegetables Extracts as Corrosion Inhibitors for Carbon Steel in Acidic Medium
2015
The effect of some Green Leafy Vegetables (GLV) extracts namely Petroselinum Crispum (Parsley), Eruca Sativa (Arugula) and Anethum Graveolens (Dill) were investigated on inhibition of corrosion carbon steel in 1 M HCl solution using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The inhibition efficiency increased as the concentration of the extract increases. Potentiodynamic polarization and electrochemical impedance spectroscopy are in good agreement where the maximum inhibition is around 92%. The results obtained showed that GLV extract inhibited the corrosion process by a physical adsorption mechanism that followed the Langmuir adsorption isotherm model. The free energy of adsorption ( G° ) was calculated revealed that the adsorption process is spontaneous and the GLV ads extracts act as a mixed-type inhibitor.
Inhibition of Corrosion of Mild Steel in Hydrochloric Acid Solution Using Akee Apple Seed Extract
Journal of Failure Analysis and Prevention, 2018
The inhibiting action of Akee apple (Blighia sapida) seed extract (AASE) on corrosion of mild steel was investigated in 2 M hydrochloric acid solution using weight loss and thermometric measurements. The study was carried out at temperatures of 30 and 60°C with concentration of inhibitor varied from 0.1 to 0.5 g/l in the acidic medium. The results of the study showed that the corrosion rate of mild steel decreased in the presence of the inhibitor but increased with increase in temperature. The inhibitor exhibited excellent inhibition efficiency on mild steel corrosion as 86.90 and 75.87% of inhibition efficiency were achieved with addition of 0.5 g/l concentration of the inhibitor at 30 and 60°C temperature, respectively. The inhibitive adsorption parameters established that the AKEE obeyed the Langmuir adsorption isotherm with physical adsorption mechanism and the result of Gibbs free energy of adsorption (DG ads) revealed an endothermic reaction and spontaneous process of adsorption.