Eco-friendly Corrosion Inhibitor Research Articles

Aloe polysaccharide as an eco-friendly corrosion inhibitor for mild steel in simulated acidic oilfield water: Experimental and theoretical approaches

Abstract An effective and biodegradable aloe polysaccharide (APS) was studied as an eco-friendly corrosion inhibitor for mild steel protection in simulated acidic oilfield water (15% HCl), whose inhibition performance was studied by weight loss tests, electrochemical techniques, and surface analysis techniques (SEM, EDX, AFM). The experimental results showed that APS has an outstanding inhibition performance for mild steel in 15% HCl, and exhibited a good inhibitory activity over a wide temperature range. Polarization studies indicated that APS is a mixed-type corrosion inhibitor, and its adsorption mode conforms to Langmuir isotherm. An adsorption-related protective inhibitor film formed on the surface of mild steel was verified and investigated based on its surface analysis and characterization. Quantum chemical calculations and molecular dynamics (MD) simulations were performed for the major monosaccharide components of APS to detect structural adsorption behavior.

BOD Composite as a New Eco-Friendly Corrosion Inhibitor

BOD Composite as a New Eco-Friendly Corrosion Inhibitor

Investigation of Losartan Potassium as an eco-friendly corrosion inhibitor for copper in 0.5 M H2SO4

Abstract Losartan Potassium (LP) is a commonly used drug for the treatment of hypertension. In this study, the corrosion inhibition performance of LP on copper in 0.5 M H2SO4 was investigated using electrochemical methods, surface morphological observation, X-ray photoelectron spectroscopy (XPS), quantum chemical calculation and molecular dynamics (MD) simulation. The electrochemical results show that LP is a type of mixed-type inhibitor that suppresses both cathode and anode reactions by forming a protective film. This film follows the Langmuir adsorption model and mainly depends on chemisorption in this process. XPS analysis confirmed that the adsorption film was due to the formation of coordination compounds between N atoms in the LP molecule and copper. Quantum chemical calculation further confirmed the active centres of N atoms in LP molecules, and MD simulation demonstrated that the inhibitor was adsorbed almost tightly and parallel to the Cu (111) surface.

Analysis of Garcinia indica Choisy extract as eco-friendly corrosion inhibitor for aluminum in phosphoric acid using the design of experiment

The inhibiting performance of Garcinia indica Choisy extract was studied on Al in phosphoric acid solution via electrochemical impedance spectroscopy technique and by using response surface methodology (RSM) of the design of experiment. The surface analysis was carried out using scanning electron microscopy (SEM) and Energy dispersive X-ray spectroscopy (EDX) to affirm the adsorption of inhibitor on the surface of metal. In the study, the influence of three process variables (extract concentration, acid concentration, and temperature) are considered on the inhibition efficiency of Al in acid. The process variables considered for the study were taken in 3 levels: temperature (X1) at 30 °C, 40 °C, and 50 °C, extract concentration (X2) at 0.1, 0.3 and 0.5 gL–1 and acid concentration (X3) at 0.5, 1.25 and 2 M. A full quadratic regression model was established and authenticated before the variables were optimized for the highest inhibition efficiency. From the results, it was inferred that the extract concentration has the maximum effect on the inhibition efficiency followed by temperature and concentration of the acid. It was also observed that the data predicted by regression analysis had a good agreement with the data obtained from the experiments with the values of R2 = 0.9946 and Adj-R2 = 0.9898 for inhibition efficiency. The optimum settings for the studied parameters were found to be at temperature (50 ℃), extract concentration (0.5 gL–1), and acid concentration (0.5 M) to achieve the maximum inhibition efficiency of 86.19%.

Experimental and theoretical study on corrosion inhibition of new synthesized menthone derivatives (Menthopyrazole compounds) for mild steel in 1 M HCl solution

The aim of the present work is to evaluate the protective ability of newly menthone derivatives 7-isopropyl-4-methyl-4,5,6,7-tetrahydro-1H-indazole (HMP) and 7-isopropyl-4-methyl-1-phenyl-4,5,6,7-tetrahydro-1H-indazole (PMP) as mild steel corrosion inhibitors in 1M HCl, which may get applications as eco-friendly corrosion inhibitors in acidizing processes in the industry. The corrosion attitude of mild steel at various concentrations of the inhibitors was examined in the range from 298 to 328 K. An increase in the inhibitory effectiveness in acidic solution at higher concentration and temperature follow the existence of inhibitors. The aspect of adsorption mixed type of inhibitors was highlighted by the Polarization curves. The adsorption of HMP and PMP is in line with the Langmuir isotherm model. Theoretical indices study of both inhibitors (HMP and PMP) via CDFT (the conceptual density functional theory) has been studied. To search for the best spatial configuration of steel/inhibitor a Monte Carlo simulation studies were applied.

A combined experimental and theoretical study of papain as a biological eco-friendly inhibitor for copper corrosion in H2SO4 medium

Papain freeze dried (PFD) was used as a novel, eco-friendly and efficient inhibitor for copper corrosion in H2SO4 medium via experimental and theoretical calculation methods. These test methods include classical weight loss experiment, electrochemical measurements, surface morphology researches, and theoretical calculations. The data of weight loss experiment proves that with the increase of temperature, PFD still exhibits excellent anti-corrosion performance. The corrosion inhibition efficiency of PFD can still be maintained at about 95% at 313 K. The results of electrochemical experiments indicate that PFD is the mixed-type inhibitor that can simultaneously restrain the reaction of anode and cathode. Both the impedance experiment results and polarization experiment data show that the corrosion inhibition efficiency of PFD exceeds 95%. The atomic force microscope (AFM) and scanning electron microscope (SEM) test results intuitively show the excellent inhibition performance of PFD. The X-ray photoelectron spectroscopy (XPS) experimental data demonstrated the formation of NCu bond, indicating that PFD can effectively separate the corrosive medium by chemical adsorption on the copper surface. Molecular dynamics simulations (MDS) manifest that PFD can adsorption on the Cu (1 1 1) surface via the parallel pattern. Besides, the adsorption process of PFD on copper surface obey the Langmuir mono-layer adsorption.

Application of Essential Oils as Green Corrosion Inhibitors

This review reports the application of essential oils (EOs) as a green corrosion/biocorrosion inhibitor. The topics discussed are: (i) sources and composition of EOs, (ii) adsorption mechanism, (iii) anticorrosion effects of EOs on metal surfaces, (iv) electrochemical investigations, (v) antimicrobial activity of EOs on corrosion-producing bacteria and algae, (vi) synergetic effects of EOs, and (vii) economical aspect and application of inhibitors. Various aspects of biofilms are discussed to identify microbiologically influenced corrosion (MIC) and the characterization of microorganisms causing MIC. The studies indicate that EOs have the potential as eco-friendly corrosion inhibitors in both aggressive chemicals and biofilm environments.

Ecofriendly green inhibitor from Hemerocallis fulva against aluminum corrosion in sulphuric acid medium

This research work aims to identify a non-toxic, cheap, and effective greener inhibitor from Hemerocallis fulva (H. fulva) for corrosion of aluminum in a 1 M H2SO4 medium at different concentrations and temperatures. We investigated the inhibitive effect of H. fulva extract in a 1 M H2SO4 solution on aluminum using weight loss measurements with various concentrations and temperatures. Evaluations of the mechanism of corrosion inhibition by potentiodynamic polarization and AC-impedance analysis were also performed. The nature of the adsorption and morphology on the surface of aluminum were performed by atomic force microscopy (AFM) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX) studies. The results suggested that the H. fulva extract can be used on aluminum as an efficient eco-friendly corrosion inhibitor in 1 M H2SO4 solution as identified using weight loss because the maximum corrosion inhibition efficiency η (%) was found to be 89% at 600 ppm at 303 ± 1 K. It was found that maximum η (%) was obtained at 303 ± 1 K compared to other temperatures (313, 323, and 333). The activation energy (Ea) was higher in the presence of inhibitor than in the absence of inhibitor, showing the temperature dependency of inhibition. The positive values of enthalpy of activation ΔH° and entropy of activation ΔS° reflect the endothermic and disordered nature of the reaction. Physical adsorption was proposed for the inhibition and the process followed the Langmuir adsorption isotherm. The negative value of ΔGoads indicates spontaneous adsorption. Polarization measurements clearly indicated that the H. fulva acts as a mixed inhibitor and the η (%) increases with inhibitor concentration. SEM-EDX, AFM, and XPS studies confirmed the formation of a protective layer over the surface of the aluminum specimen.

Dardagan Fruit extract as eco-friendly corrosion inhibitor for mild steel in 1 M HCl: Electrochemical and surface morphological studies

Abstract In this study, Dardagan Fruit (DF) from Bingӧl - Turkey was tested as inhibitor corrosion for mild steel protection in 1 M HCl solution using electrochemical techniques. The surface of mild steel was examined by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Elemental composition of the surface after exposing to test solutions was analyzed with the help of energy dispersive X-ray spectroscopy (EDX). Contact angle measurements were also performed to get information about the surface properties. Spectroscopic studies were performed to determine major components, chemical structure and adsorption mechanism of the extract. The excess surface charge of mild steel was determined using electrochemical impedance spectroscopy (EIS) and an inhibition mechanism was proposed. It was found that DF has good corrosion protection ability. The inhibition of corrosion rate reduces when concentration of DF and exposure time are increased and reaches 92% after 1 h and 97% after 6 h immersion to 3000 ppm inhibitor containing corrosive media. The high protection ability was assigned to formation of a homogenously distributed protective film over the metal.

New environmental friendly corrosion inhibitor of mild steel in hydrochloric acid solution: Adsorption and thermal studies

In the present investigation, coumarin derivative 4-((4-amino-5-thio-1,2,4-triazol-3-yl)methyl)coumarin (ATTC) have synthesized as novel ecofriendly corrosion inhibitor and evaluated the corrosive ...

Optimization of Espresso Spent Ground Coffee Waste Extract Preparation and the Influence of its Chemical Composition as an Eco-friendly Corrosion Inhibitor for Carbon Steel in Acid Medium

This work proposes the reuse of spent ground coffee waste (SCG) extracts as eco-friendly corrosion inhibitors for carbon steel in acid medium, and the correlation between their anticorrosive efficiency and chemical composition. The extraction method was optimized using a central composite design, and the chemical composition of the extracts was accessed using UV-Vis spectrometry, HPLC, and ICP-OES. EIS and Potentiodynamic Polarization (PP) tests evaluated the anticorrosive properties of the extracts. Total phenol content ranged from 93 mg L-1 to 219 mg L-1 Gallic Acid Equivalent. The highest concentration of phenolic compounds was observed for syringic acid (78.67 mg L-1), while the lowest concentration was verified for (-)-epigallocatechin-3-O-gallate (0.01 mg L-1). The Pearson correlation coefficient showed no correlation between the Rct and the total phenol content, although, positive correlations with the Rct was observed for caffeic acid, (+)-catechin, ferulic acid, and protocatechuic acid. EIS analysis revealed that all of the extracts could act as corrosion inhibitors. The best performance was verified for C3 extract (IE % = 94.83%). PP tests showed that this extract acted as a mixed inhibitor, with a predominant cathodic effect. Therefore, the valorization of the extracts as corrosion inhibitors was successfully achieved.

The Extract of Siamih (Ageratum conyzoides L) Leaf as a Green Eco-Friendly Corrosion Inhibitor for the Mild Steel St. 37 in HCl Solution

The extract of siamih (Ageratum conyzoides L) leaf was tested as a corrosion inhibitor of St. 37 steel in HCl medium using weight loss method, potentiodynamic polarization, Fourier Transform Infrared (FT-IR) analysis, and Scanning Microscopy Electron (SEM) analysis. Based on the method of weight loss, it can be seen that the corrosion rate decreases with the addition of the extract of siamih leaf. The highest inhibitory efficiency was 85.33% with the addition of an extract of 8 g/L, without the addition of iodide ions. The effect of temperature causes the inhibition efficiency to decrease with increasing temperature. Potentiodynamic polarization measurements show that the extract of siamih leaf is a mixed type inhibitor. SEM analysis shows the difference in the surface of the steel immersed in HCl without and with the addition of the extract of siamih leaf. There was a change in the shift in the wavenumber shown by the FT-IR spectrum before and after the extract of siamih leaf was added. The extract of siamih leaf adsorption on the steel surface corresponds to the Langmuir adsorption isotherm.

Commercial aqueous additives as used eco-friendly corrosion inhibitors for carbon steel in natural seawater

Commercial aqueous additives as used eco-friendly corrosion inhibitors for carbon steel in natural seawater

Utilization of 1-butylpyrrolidinium Chloride Ionic Liquid as an Eco-friendly Corrosion Inhibitor and Biocide for Oilfield Equipment: Combined Weight Loss, Electrochemical and SEM Studies

Abstract With the help of the weight loss, and electrochemical techniques the suppressing action of the commercially available ionic liquid, 1-butylpyrrolidinium chloride [BPm1,1] Cl for carbon steel corrosion in 3.5% NaCl medium was scrutinized. It found that this compound acts as an excellent inhibitor with protection performance raised by an increase of its concentration and temperature. The adsorption behavior of the investigated ionic liquid was a mixed-type inhibitor subordinating Langmuir adsorption isotherm. To expounding adsorption and corrosion inhibition mechanisms, various thermodynamics and activation parameters such as adsorption constant (Kads), Gibb’s standard free energy ( Δ G ∗ $\Delta{{\text{G}}^{\ast}}$ ), activation energy (Ea), activation enthalpy ( Δ H ∗ $\Delta{{\text{H}}^{\ast}}$ ), and activation entropy ( Δ S ∗ $\Delta{{\text{S}}^{\ast}}$ ) were determined and debated. It has appeared that there is a strong interaction between the inhibitor molecules and the carbon steel surface in a predominantly chemisorptions manner. The presence of a protective inhibitor film on the metal surface was confirmed using a corroborative SEM tool. Moreover, the IL has screened for antibacterial activity against planktonic and sessile microorganisms. The obtained results emphasized that the utilized ionic liquid can be regarded as an efficacious biocide for both bacterial strains with a dissimilar efficiency.

Squid By-product Gelatin Polymer as an Eco-friendly Corrosion Inhibitor for Carbon Steel in 0.5 M H2SO4 Solution: Experimental, Theoretical, and Monte Carlo Simulation Studies

A squid by-product (SBP) gelatinous protein polymer has been extracted, characterized, and examined as eco-friendly inhibitor for carbon steel in 0.5 M H2SO4 media by weight loss and electrochemical techniques. It was found that the SBP acts as a good corrosion inhibitor. The inhibition efficiency increases with increasing inhibitor concentration, but the temperature has hardly affected on the inhibition efficiency of SBP. Thermodynamic data clearly show that the adsorption mechanism of SBP on the carbon steel surface in 0.5 M H2SO4 solution is mainly physical adsorption. Moreover, the adsorption of the SBP molecules was found to follow a Langmuir adsorption isotherm. Results of potentiodynamic polarization measurements revealed that the SBP acts as mixed-type inhibitor. Data obtained from electrochemical impedance spectroscopy studies were analyzed to model inhibition process through appropriate equivalent circuit model. Theoretical parameters derived from quantum chemical calculations as well as binding energy derived from molecular dynamics simulation studies adequately corroborate the trend of experimental inhibition efficiencies of the studied inhibitors.

Effects of Cinnamaldehyde as an Eco-Friendly Corrosion Inhibitor on Mild Steel in Aerated NaCl Solutions

This article investigates the impact of cinnamaldehyde as an eco-friendly inhibitor in mitigating corrosion detriment on mild steel in aerated NaCl (3% w/w) using weight loss and potentiodynamic polarization methods. The results indicate moderate inhibition efficiency of cinnamaldehyde reaching around 70% at an optimum level of 0.5 g/L or 500 ppm by establishing an adsorption film on metal surface. Adsorption of the cinnamaldehyde seemed to adhere to the Langmuir isotherm. The corrosion rate decreased with cinnamaldehyde dose up to the optimum level while increased slowly with the medium temperature. The activation energy (Ea) achieved with cinnamaldehyde was found to be lower than that of without cinnamaldehyde. The polarization curves revealed that the inhibitor performs as a mixed-type inhibitor since it diminishes both anodic and cathodic current densities. The calculated inhibition efficiencies using both corrosion monitoring techniques were found to be in good agreement. Additionally, the mild steel surfaces (inhibited and uninhibited) were examined by using SEM–EDX analysis.

Evaluation of corrosion inhibition to Pteridium aquilinum extract via the methods of electrochemistry experiment

Plant extracts are expected to be used as eco–friendly corrosion inhibitors due to their advantages of natural degradation and regeneration. In this study, potentiodynamic polarization and electrochemical impedance spectroscopy were used to evaluate the inhibition performance of Pteridium aquilinum (L.) Kuhn (Pteridium aquilinum) extract on carbon steel in hydrochloric acid. The temperature adaptability of Pteridium aquilinum extract in the range of 25 °C–45 °C was investigated by scanning electron microscope. The functional groups in Pteridium aquilinum extracts were analyzed by Fourier transformed infrared spectroscopy. The results showed that the Pteridium aquilinum extract followed the Langmuir adsorption isotherm and acts as mixed–type corrosion inhibitor. Inhibition efficiency up to 96.9% has been achieved for 500 ppm Pteridium aquilinum extract at 25 °C. This study provides an important and useful reference for the research and utilization of plant extracts as corrosion inhibitors.

Facile size and chemistry-controlled synthesis of mussel-inspired bio-polymers based on Polydopamine Nanospheres: Application as eco-friendly corrosion inhibitors for mild steel against aqueous acidic solution

In recent studies, biopolymers such as chitosan and alginate have been applied as effective inhibitors for acidic-induced corrosion of metals. In this study, polydopamine (PDA) nanoparticles with different water stabilities, sizes, and chemistries were synthesized via three different methods (PDA-1, PDA-2, and PDA-3). The size, morphology, and chemistry of the PDA nanoparticles were investigated by FE-SEM, FT-IR, UV–Visible and zeta potential methods. FE-SEM analysis revealed a significant size difference between the PDA particles obtained from the three methods. Finer particles were obtained for PDA-2 and PDA-3 samples. In addition, PDA-2 particles showed higher hydrophilic natures compared with PDA-1 and 3 due to the presence of large numbers of carboxylic groups in its structure. The inhibition abilities of the PDA-1, PDA-2 and PDA-3 particles against mild steel corrosion in 1 M HCl solution were studied by EIS and polarization methods. Results evidenced 93%, 99%, and 96% inhibition degrees in the solutions containing 5 mg/L PDA-1, PDA-2 and PDA-3 particles, respectively. Polarization test results evidenced that all PDA particles could suppress the steel corrosion via a mixed-type inhibition mechanism with a dominant anodic effect. The generation of a dense film composed of PDA particles on the steel substrates subjected to the HCl solutions was demonstrated by SEM analysis results.

Rhamnolipids as an eco-friendly corrosion inhibitor of rebars in simulated concrete pore solution: evaluation of conditioning and addition methods

ABSTRACTThe objective of this study was to evaluate the use of rhamnolipids (RLs) extracted from Pseudomonas aeruginosa as a possible eco-friendly inhibitor for the corrosion protection of rebars in concrete. Two application methods were tested: application of RLs as a coating on the steel (conditioning method) and addition of the RLs directly to the aggressive environment (addition method). Both methods were evaluated for their ability to protect steel in simulated concrete pore solution containing 0.5 M NaCl. The results highlight a delay in the initiation of local corrosion followed by a rapid propagation rate of corrosion for conditioning method. This evolution is in relation with the heterogeneity of the formed RLs layers. The addition method provides a different film formation and better protection against corrosion. Using a 1 g·L concentration, the inhibition effect was observed at least for 24 h of immersion.

Employing ginger extract as an eco-friendly corrosion inhibitor in cementitious materials

In our recent work, the inhibition effect of ginger extract was preliminarily studied in simulated concrete pore solutions. Now it was applied in cementitious materials to augment the reinforcement corrosion resistance. The inhibition effects of ginger extract and three other commonly used corrosion inhibitors were studied and compared by means of open circuit potential, linear polarization resistance and electrochemical impedance spectroscopy. X-ray photoelectron spectroscopy was used to analyze the chemical compositions of the film formed on the steel bar embedded in the cement mortars. For further understanding the insight of inhibition mechanisms, molecular dynamics and quantum mechanics methods were used to simulate the adsorption processes of the major inhibition molecules onto the surface of steel reinforcement. In addition, the effects of the ginger extract on the flowability and strength of fresh and hardened cement mortars were also examined. The results showed that the ginger extract acting as an effective corrosion inhibitor can lower the corrosion risk of steel bars embedded in cement mortars. The ginger extract’s effective corrosion inhibition was mainly attributed to the formation of a carbonaceous organic film on the steel surface. According to the experimental and simulation results, three potential mechanisms of adsorption were proposed. Plus, it was found that the addition of the ginger corrosion inhibitor in cement mortars had a positive effect on the flowability and a negligible negative effect on the strength. The overall findings demonstrated that this ginger extract holds great potential for broader applications in practical engineering.