Corrosion Inhibition Of Carbon Steel Research Articles

Experimental and Theoretical Studies of Tailor-made Schiff Bases as Corrosion Inhibitors for Carbon Steel in HCl

Strong acids used in industrial applications as cleaning, descaling, among others, can severely damage metallic structures, requiring corrosion inhibitors to diminish or avoid these issues. Since many conventional compounds used for this purpose may result in environmental and human health issues, eco-friendly compounds such as Schiff bases have been recently investigated. The synthesis of three novel Schiff bases (SBs) was confirmed by infrared spectroscopy (FTIR) and hydrogen nuclear magnetic resonance (1H-NMR). Weight loss measurements were carried out in 1 M HCl over 303K-333K. Furthermore, the combination of these compounds with a surfactant improved the efficiencies, reaching an efficiency of 93%. Optical and scanning electron microscopies confirmed the reduced roughness and pit depths of carbon steel samples. Density-functional theory calculations for neutral forms of SBs revealed that the geometrical and the energetical parameters are similar for the three studied SBs. The geometrical results exhibited more planar structures of protonated species, improving the chemical and physical interactions between aromatic rings and metallic atoms.

Corrosion inhibition of carbon steel by acridine orange in HCl solution: Electrochemical and weight loss studies

The inhibition effect of acridine orange (AO) on the corrosion of A105 carbon steel in 0.5 M hydrochloric acid has been investigated using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and weight loss tests. Using polarization plots and corrosion rate calculations, it has been revealed that AO acts as an effective inhibitor. The results have showed that the inhibition efficiency increases with increasing inhibitor concentration and A behaves as a mixed type inhibitor in HCl solution. Based on the data obtained from the EIS tests, it has been determined that the charge transfer resistance increased from 74.20 Ω.cm2 for blank solution to 250 Ω.cm2for 100 ppm of AO. Comparison of the results obtained from the three methods, have shown that the methods are in acceptable agreement. Investigation the effect of temperature in the range of 20-60 °C has indicated that the inhibition efficiency increased with temperature, so that at 40 and 60 °C, the inhibition efficiency would reach 90%. The thermodynamic parameters of steel dissolution including activation energy, standard enthalpy and entropy of activation have been calculated and discussed. It was also found, that the adsorption of AO on the steel surface has obeyed Langmuir isotherm and adsorption has been performed spontaneously.

Mentha piperita extract as a natural product for the corrosion inhibition of low carbon steel in a polluted NaCl environment: Chemical, electrochemical and biological studies

The impact of aqueous Mentha piperita extract (MPE) as a corrosion inhibitor for low carbon steel (LCS) in NaCl/Na2S solution has been investigated using chemical and electrochemical techniques to evaluate the protection performance of MPE. ―As the concentration of the extract increased, the protection efficiency (PE) increased, reaching 91.2% at 300 ppm, whereas the increase in temperature favoured to slow decrease‖.The extract has been physically adsorbed on the metal surface according to the Temkin isotherm. Polarization data reveal that this extract acts as a mixed inhibitor. The mechanism of corrosion protection of MPE has been discussed from electrochemical techniques. MPE has been adsorbed on LCS obeying Temkin isotherm. Surface morphology techniques such as scanning electron microscopy (SEM) and atomic force microscopy have been used to demonstrate the creation of a protective coating on the LCS in the presence of MPE. The extract inhibits the bacterial activity of Escherichia coli.

Synthesis of polymeric surfactant containing bis-cationic motifs as a highly efficient acid corrosion inhibitor for C1018 carbon steel

Synthesis of polymeric surfactant containing bis-cationic motifs as a highly efficient acid corrosion inhibitor for C1018 carbon steel

Synthesis of polymeric surfactant containing bis-cationic motifs as a highly efficient acid corrosion inhibitor for C1018 carbon steel

The present study described synthesizing and characterizing a poly(methyldiallylammonium chloride)-based surfactant containing bis-cationic motifs (9) through a series of reactions. It was evaluated as a corrosion inhibitor for C1018 CS in 1 M HCl.

Chemical and Electrochemical Studies on Expired Lioresal Drugs as Corrosion Inhibitors for Carbon Steel in Sulfuric Acid

Lioresal is a muscle relaxer and an antispasmodic agent, known as Lioresal. The active ingredient is β-(Aminomethyl)-p-chlorohydrocinnamic acid, a racemic mixture of the R,(-) and S, (+) isomers. It affects directly the spinal cord with adverse effects including drowsiness, dizziness, weakness, fatigue, headache, trouble sleeping, nausea and vomiting, urinary retention, or constipation. Therefore, the accumulation of expired or unused Lioresal in our home is so dangerous and harmful for our children. The present work introduces an idea for using expired Lioresal as a corrosion inhibitor for steel in 1.0 M H2SO4. The effect of both concentration and temperature were studied. The inhibition efficiency was found to increase with concentration and decreased with rising temperature. Chemical, electrochemical, and analytical techniques, namely, gravimetric, thermometric, gasometric, acidimetric, AAS, and potentiodynamic polarization were used to evaluate the inhibition action of the expired Lioresal drugs. The inhibition performance is due to the adsorption and adhesion of drugs constituent molecules on the steel surface. The adsorption was found to obey Langmuir isotherm. The surface area available for the anodic dissolution of iron and cathodic hydrogen evolution process diminishes without changing the reaction mechanism. The values of Ecorr. readings slowly decrease to negative values, showing that these inhibitors are mixed-type inhibitors mainly cathodic inhibitors. The data obtained from different techniques are in good agreement with each other. Electrochemical and analytical Techniques are efficient and accurate in the determination of the corrosion rate and inhibition performance of expired drugs in an aqueous medium.

Use of copper carbonate as corrosion inhibitor for carbon steel in post combustion carbon capture

The realisation of post-combustion CO2 capture (PCCC) at industrial scale remains limited; one challenge is the concerns around capital costs and another concern is corrosion of the system itself. Corrosion resistance and mitigation against the amine solvent monoethanolamine (MEA) was studied, using the inhibitor copper (II) carbonate basic (CC). Carbon steel (C1018) was tested in CO2 loaded, 5M aqueous MEA solution, alone and in the presence of CC, to assess the corrosivity of the solution. Immersion testing used mass loss, Fe and Cu ion concentration in solution via ICP-MS, imaging (SEM) and analytical techniques (XRD and EDX) to investigate the effect of corrosion. Generally, the use of CC improved C1018 corrosion resistance relative to C1018 alone. Even at low concentrations (0.9 mM), CC was effective in inhibiting corrosion against CO2 loaded MEA, as the observed corrosion rate was effectively zero and no dissolved Fe was detected in solution. There was no evidence of copper surface adsorption. To clarify the solution chemistry resulting in corrosion inhibition, the local chemical environment of Fe and Cu were probed by Cu and Fe K-edge X-ray Absorption Spectroscopy, respectively. The Cu K- edge HERFD-XANES spectra reveal that a Cu2+ amine complex forms, critical to understanding the structure which is promoting significant corrosion inhibition.

Asymmetric Gemini surfactants as corrosion inhibitors for carbon steel in acidic medium: Experimental and theoretical studies

Asymmetric Gemini surfactants are a kind of novel surfactants with corrosion resistance ability, which are expected to be widely used in metal anti-corrosion during the pickling treatment. In this work, two asymmetric Gemini surfactants, N1-(3-dodecanamidopropyl)-N3-dodecyl-2-hydroxy-N1,N1,N3,N3-tetramethylpropane-1,3-diammonium (surfactant Ⅰ) and N1-(3-dodecanamidopropyl)-N3-tetradecyl-2-hydroxy-N1,N1,N3,N3-tetramethylpropane-1,3-diammonium (surfactant Ⅱ), were utilized as the corrosion inhibitor for A3 carbon steel in acidic medium. Weight-loss measurements indicated that the inhibition efficiency (ηw%) increased with increasing asymmetry degree, and the maximum values of ηw% for surfactants Ⅰ and Ⅱ reached 98.37% and 97.21% at 85 °C, respectively. The adsorption of these surfactants obeyed the Langmuir adsorption isotherm. The electrochemical measurements suggested that the two surfactants would serve as mixed-type inhibitors. The results obtained from scanning electron microscope (SEM), atomic Force Microscope (AFM) and X-ray diffraction characterizations (XRD) were in accordance with the experimental results that surfactants Ⅰ and Ⅱ are effective inhibitors for the metal in acidic medium. The quantum chemical study and Molecular dynamics (MD) simulation further supported the experimental results and provided insight into a deeper understanding of the inhibition mechanism of asymmetric Gemini surfactants.

Theoretical evaluation of spirocyclic compounds as green corrosion inhibitors for carbon steel

The Corrosion inhibition efficiency of some spirocyclic compounds in the presence of HCl 0.1 M as a corrosive electrolyte was explored using density functional theory (DFT) calculations and molecular dynamics (MD) simulations. All DFT calculations were performed using B3LYP functional in conjunction with 6-31+G(d) and 6-311++G(d,p) basis sets at both gas and solvent phases for protonated and neutral forms of inhibitory molecules. The highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) energy levels, HOMO-LUMO energy gap, quantum molecular descriptors, and thermochemical parameters were calculated to determine the most effective corrosion inhibitors. MD simulations revealed that the adsorption energies (Eads) of the inhibitors on steel are dependent on the number of molecules introduced in the simulated systems. The more inhibitory molecules are adsorbed on the Fe substrate, the more anti-corrosion effect they have. The most negative Eads value observed occurs at 308 K, while it decreases at 318 K for all the other simulated systems, resulting in one of the molecules being identified as a potential carbon steel corrosion inhibitor for further experiments.

Corrosion inhibitors for carbon steel: A review

AbstractCorrosion inhibitors are one of the practical and cost‐effective way of preventing and inhibiting corrosion. An inhibitor's primary function includes creating a barrier by forming one or more molecular layers to protect against corrosive attacks. Organic molecules are one of the most popular, efficient, and practical corrosion inhibitors, and all studies demonstrate that organic compounds, preferentially those containing nitrogen (N), sulphur (S), and oxygen (O), have high inhibitory efficiency. Also, corrosion inhibitors include inorganic compounds. Since inorganic and organic inhibitors are both toxic and expensive; emphasis is being placed on developing green corrosion inhibitors as well as on modification of inhibitors. We are focusing on carbon steel (CS) substrate in this review as it is the first‐line material and is widely employed in various industrial applications. Whereas corrosion resistance of CSs in acidic environments is a constantly evolving topic, working on better performance of CSs as more cost‐effective alternatives to other alloys.

Rare earth cerium-phenanthroline binary complex as a new corrosion inhibitor for carbon steel in acidic medium

Rare earth cerium-phenanthroline binary complex as a new corrosion inhibitor for carbon steel in acidic medium

Synthesis, Characterization, Thermodynamic Analysis and Quantum Chemical Approach of Branched N, N′-bis(p-hydroxybenzoyl)-Based Propanediamine and Triethylenetetramine for Carbon Steel Corrosion Inhibition in Hydrochloric Acid Medium

The influence of branched N, N′-bis(p-hydroxybenzoyl) containing propylenediamine (PDA) and triethylenetetramine (TETA) composites for corrosion inhibition of carbon steel in acidic solution (1 M HCl) was investigated using several quantum chemical, electrochemical impedance spectroscopy and potentiodynamic polarization as electrochemical techniques. The investigated molecules were posteriorly characterized by proton nuclear magnetic resonance (1H NMR) and Fourier transform infrared spectroscopy (FTIR) while the surfaces of carbon steel test coupons were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The obtained results revealed that the two amino compounds, N, N′-bis(p-hydroxybenzoyl) propanediamine (N, N′-HBPDA) and N, N′-bis(p-hydroxybenzoyl) triethylenetetramine (N, N′-HBTETA), have significant efficiency toward steel corrosion attack and its inhibition performance was significantly boosted by increasing concentration of di- and tetramine containing inhibitors. The two inhibitors achieved a maximum corrosion inhibition efficiency of 99.1% as indicated from polarization measurements. The isotherm feature of Langmuir adsorption appeared to be proper factor for associating the experimental gains with an applicable mechanism of inhibition process. The free energy ∆Gads was calculated to be − 27.5, 29.1 kJ/mol based on the adsorption isotherm model, indicating physical adsorption on the carbon steel surface. Further, images of the morphological analysis exhibited various features of attack owing to the aggressive medium and the employed concentration of the inhibitor. These synthesized amines supplied many favorable scores in the fabrication of functional mixed-type inhibitors. The computational studies reveal that N, N′-HBPDA and N, N′-HBTETA molecules could absorb via several lone pairs and π clouds, confirming their ability to be good corrosion inhibitors.

Synergism of alkylbenzene sulfonate and cetyltrimethylammonium bromide on corrosion inhibition of carbon steel in CO2 -saturated solutions

The synergistic effect of mixed surfactants, linear alkylbenzene sulfonate (LAS) and cetyltrimethylammonium bromide (CTAB), in inhibiting corrosion of CO2 on carbon steel was studied by weight loss and electrochemical measurement. The surface properties of LAS, CTAB, and their mixture in solution were also studied by surface tension and phase behavior. The surface of corrosion specimens was characterized by infrared spectroscopy, scanning electron microscopy, contact angle, and atomic force microscopy. The results show that LAS, CTAB, and their mixture are inhibitors mainly inhibiting anode reactions. The adsorption of LAS and CTAB molecules on the surface of steel belongs to chemical adsorption and follows Temkin adsorption. LAS or CTAB alone aggregated form spherical micelles or rod-like micelles, which results in the defective film layer and localized corrosion on surface of the steel. Mixed surfactants form closely packed lamellar microstructure in the solution which is correlated to compact adsorption film on the metal surface and better corrosion inhibition. The inhibition efficiency is the highest when the mixed ratio of LAS and CTAB is 2:1.

Corrosion Inhibition of Rumex vesicarius Mediated Chitosan-AgNPs Composite for C1018 CS in CO2-Saturated 3.5% NaCl Medium under Static and Hydrodynamic Conditions

Rumex vesicarius (RVE) mediated chitosan–AgNPs composite was produced in situ by using an aqueous extract of Rumex vesicarius leaves as the reducing agent to reduce Ag+ to Ag0. The synthesized composite was evaluated as a sweet (CO2) corrosion inhibitor (CI) for C1018 carbon steel (CS) in 3.5 wt% NaCl solution under static and hydrodynamic conditions. The corrosion inhibitive performance was evaluated using electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR), and potentiodynamic polarization (PDP) techniques, as well as scanning electron microscopy (SEM)/energy dispersive X-ray spectroscopy (EDAX), and atomic force microscopy (AFM) on corroded C1018 CS without and with additives. The effect of concentration, immersion time, temperature, and rotation speed on the CI performance of the composite was also investigated. The corrosion inhibitive effect increased with increasing composite dosage, with the highest inhibition efficiency (IE) acquired at the maximum composite dosage of 0.3%. Beyond this concentration, the IE decline with increasing concentration. Furthermore, IE was found to increase with immersion time and decline with a temperature rise from 25 to 40 °C, with the optimum temperature of 60 °C found to accelerate corrosion without and with RVE-mediated Chi–AgNPs composite. Under high shear stress, the Chi–AgNPs composite exhibits moderate corrosion inhibition under hydrodynamic conditions. The surface analysis results validate the formation of a protective covering due to composite adsorption on the CS surface. The RVE-mediated chitosan–AgNPs composite could be recommended as a CI for C1018 CS in sweet (CO2) corrosion environments at ambient temperature.

Burghul Plant Extract as a Green Corrosion Inhibitor for Carbon Steel in Hydrochloric Acid Solution

Burghul Plant Extract as a Green Corrosion Inhibitor for Carbon Steel in Hydrochloric Acid Solution

Synthesis of new halogenated compounds based on 8-hydroxyquinoline derivatives for the inhibition of acid corrosion: Theoretical and experimental investigations

In the present work, a new 8-hydroxyquinoline substituted with bromine (Q-C4Br) and chlorine (Q-C4Cl) was first synthesized and introduced as a powerful corrosion inhibitor for carbon steel in 1.0 M HCl. These compounds were obtained in high yield, and their structures were characterized by infrared (IR) spectroscopy, NMR spectroscopy ( 13 C, 1 H) and elemental analysis (EA). The anti-corrosion properties of Q-C4Br and Q-C4Cl were tested by experimental [mass loss (ML), potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS)] and theoretical [density functional theory (DFT), Monte Carlo simulations (MC) and molecular dynamic simulations (MD] methods. Inductively coupled plasma mass spectrometry-optical emission spectrometry (ICP-OES) and UV–visible spectroscopy (UV–vis) were used to identify the corrosion and inhibition processes in solutions. The surface morphology of the steel surface after corrosion and inhibition processes was investigated by AFM, EDS, SEM and FT-IR spectroscopy. It is found that these compounds are ideal corrosion inhibitors for steel, and Q-C4Cl was a better inhibitor than Q-C4Br. The inhibition behaviour, chelation characteristics, donor-acceptor effects and coordination bonding properties of the 8-hydroxyquinoline ring were enhanced by the Br and Cl modifications. The obtained results may be useful for creating the next generation of corrosion inhibitors based on aromatic compounds in future research works.

Electrochemical and Theoretical Examination of Some Imine Compounds as Corrosion Inhibitors for Carbon Steel in Oil Wells Formation Water

Electrochemical and Theoretical Examination of Some Imine Compounds as Corrosion Inhibitors for Carbon Steel in Oil Wells Formation Water

The corrosion inhibition of carbon steel in 1 M HCl solution by Oestrus ovis larvae extract as a new bio–inhibitor

Since, nowadays, utilizing the eco-friendly and economic corrosion inhibitors in various industries is a challenge, in this research, the corrosion behavior of carbon steel in the HCl solution by the addition of the extract of Oestrus ovis larvae as a novel bio-inhibitor has been evaluated. The electrochemical tests plus the gravimetric investigations were performed to study the corrosion property of steel substrates in various concentrations of bio-inhibitor (0.25–3 g/L). Different methods such as grazing incidence X-ray diffraction, field emission scanning electron microscopy (FESEM), and atomic force spectroscopy (AFM), were utilized to detect the chemical composition and morphology of corroded surfaces. Results of the Tafel polarization showed that the inhibition efficiency was about 57–86% with the highest value at the inhibitor concentration of 1 g/L. Electrochemical impedance spectroscopy results indicated that with the specified concentration of bio-inhibitor the electrochemical properties of samples changed based on the suggested electrical circuit. Results showed that the adsorption isotherm of the inhibitor was the Langmuir model with the cathodic-anodic performance. Both FESEM and AFM images demonstrated that the intensity of deterioration and the roughness of corroded surfaces reduced significantly at the optimum concentration of inhibitor (1 g/L). The inhibition mechanism was proposed based on experimental results.

Preparation of Isoetes sinensis Extract as a Green Corrosion Inhibitor for Q235 Carbon Steel in Hydrochloric Acid

Preparation of Isoetes sinensis Extract as a Green Corrosion Inhibitor for Q235 Carbon Steel in Hydrochloric Acid

Characterization of PVVH/PEMA blend polymer with gold nanoparticles as corrosion inhibitors for N80 carbon steel in a 5% sulfamic acid solutions

Characterization of PVVH/PEMA blend polymer with gold nanoparticles as corrosion inhibitors for N80 carbon steel in a 5% sulfamic acid solutions