Corrosion Inhibition Behavior Research Articles

Recent Advances on the Corrosion Inhibition Behavior of Schiff base Compounds on Mild Steel in Acidic Media

AbstractCorrosion inhibitors for mild steels subjected to aggressive media are needed by various industries, especially in power plants, petrochemical, automobile, and pharmaceutical. Accordingly, Schiff bases as a category of organic inhibitors have demonstrated efficient protecting activity in corrosive environments. This review focuses on the corrosion inhibitory performance of different Schiff bases for mild steel in acidic media and underlines the reports on which the protecting efficiency and applicability of Schiff bases have been affected by introducing different reagents as well as considering the environmental and structural issues. Therefore, discussed influential factors could endow approaches to design and apply more effective Schiff bases in the corrosion field, particularly alternatives under ecological guidelines and high inhibition efficiency.

Interfacial Adsorption and Corrosion Inhibition Behavior of Environmentally Friendly Imidazole Derivatives for Copper in the Marine Environment

Copper and copper alloys are commonly used in industry due to their excellent mechanical properties, making research on the corrosion resistance of copper of great significance. The corrosion inhibition properties of 2-imidazolidinone and allantoin for copper in 3.5 wt % NaCl were studied by weight loss and electrochemical tests. Changes in the density of the copper corrosion current and the impedance module indicated that 2-imidazolidinone and allantoin exhibited cathodic corrosion inhibitors and a valid protective effect. Meanwhile, the weight loss tests showed that the inhibition efficiency of 2-imidazolidinone and allantoin at 3 mM reached 98.94% and 97.82%, respectively. The surface physiochemical properties were qualitatively and quantitatively studied by using SEM-EDS, XPS, white light interferometry, and contact angle analysis. The interfacial adsorption behavior revealed by QCM, synchrotron radiation micro-infrared, and adsorption isotherm analysis indicated that both imidazole derivatives formed an effective and rigid physical adsorption film and obeyed the Langmuir adsorption model on copper, while both the mass and thickness of the adsorption film formed by 2-imidazolidinone were higher than those of allantoin. This study contributed to an in-depth understanding of the interfacial adsorption behavior and corrosion inhibition ability of 2-imidazolidinone and allantoin and provided guidelines for the design and development of novel heterocycles as potential corrosion inhibitors for copper in marine environments. In particular, copper was used as a corrosion inhibitor in seawater storage and transport equipment.

Coco Monoethanolamide Surfactant as a Sustainable Corrosion Inhibitor for Mild Steel: Theoretical and Experimental Investigations.

Recent studies indicate that surfactants are a relatively new and effective class of corrosion inhibitors that almost entirely meet the criteria for a chemical to be used as an aqueous phase corrosion inhibitor. They possess the ideal hydrophilicity to hydrophobicity ratio, which is crucial for effective interfacial interactions. In this study, a coconut-based non-ionic surfactant, namely, coco monoethanolamide (CMEA), was investigated for corrosion inhibition behaviour against mild steel (MS) in 1 M HCl employing the experimental and computational techniques. The surface morphology was studied employing the scanning electron microscope (SEM), atomic force microscope (AFM), and contact measurements. The critical micelle concentration (CMC) was evaluated to be 0.556 mM and the surface tension corresponding to the CMC was 65.28 mN/m. CMEA manifests the best inhibition efficiency (η%) of 99.01% at 0.6163 mM (at 60 °C). CMEA performs as a mixed-type inhibitor and its adsorption at the MS/1 M HCl interface followed the Langmuir isotherm. The theoretical findings from density functional theory (DFT), Monte Carlo (MC), and molecular dynamics (MD) simulations accorded with the experimental findings. The MC simulation's assessment of CMEA's high adsorption energy (-185 Kcal/mol) proved that the CMEA efficiently and spontaneously adsorbs at the interface.

Adsorption and corrosion inhibition behaviour of Brassica juncea root extract on mild steel

Adsorption and corrosion inhibition behaviour of Brassica juncea root extract on mild steel

Insight on the corrosion inhibition of nanocomposite chitosan/boron nitride integrated epoxy coating system against mild steel

Research in the field of organic and inorganic corrosion inhibitors has become prominent in recent years whereas its applicability is limited owing to the toxicity, non-biodegradability, low inhibition efficiency, etc. Polymer nanocomposites have high mechanical strength, stiffness, toughness, and thermal stability. They act as barriers against moisture and gases which enhance their applicability to various fields. The present study focuses on the synthesis of nanocomposite of chitosan/boron nitride (CS-BN) by sol-gel process and incorporated into epoxy matrix. The composite is then characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). XRD results show that nano hexagonal boron nitrides are finely scattered in the chitosan matrix. The thermal stability of the CS-BN composite was studied with TGA. The study depicts that boron nitride increases the thermal stability of chitosan. The corrosion protection features of biocompatible chitosan/boron nitride nanocomposite on mild steel (MS) substrate in 1 mol/L HCl solution were monitored by potentiodynamic polarization studies (Tafel), electrochemical impedance spectroscopy (EIS), and linear polarization studies (LPS). X-ray photoelectron spectroscopy (XPS) analysis was adopted to propose the mechanism of corrosion and also used to compare the corrosion inhibition behavior of BN in composite on MS surface.

Sodium dodecyl sulfate (SDS) as an effective corrosion inhibitor for Mg-8Li-3Al alloy in aqueous NaCl: A combined experimental and theoretical investigation

The corrosion inhibition behavior of Mg-8Li-3Al alloy in NaCl solution with sodium dodecyl sulfate (SDS) was investigated by hydrogen analysis, scanning electron microscopy (SEM), electrochemical test, scanning Kelvin probe force microscopy (SKPFM) and computational methods. Results showed that the corrosion resistance of Mg-8Li-3Al alloy in NaCl solution was effectively improved with SDS. The SEM and SKPFM results confirmed a dense, 200 nm-thick SDS-adsorbed layer had formed on the alloy surface. The separation energy ∆ E gap and adsorption energy E ads of SDS on the Mg surface were calculated by density functional theory and molecular dynamics simulations, respectively. And the corrosion inhibition mechanism was hypothesized and described.

4-Hydroxybenzoato-rare earth(iii) complexes – syntheses, a structural goldmine from coordination diversity and improved corrosion inhibition behaviour

A range of rare earth(iii) 4-hydroxybenzoato (4hob) complexes has been prepared and structurally characterized. The La, Ce and Y complexes are good corrosion inhibitors for mild steel.

Assessment of Corrosion Protection Performance of FeOOH/Fe3O4/C Composite Coatings Formed In Situ on the Surface of Fe Metal in Air-Saturated 3.5 wt.% NaCl Solution

The purpose of this work is to evaluate the corrosion-inhibition behavior of deposited carbon and some iron-oxide hybrid coatings which derived from the in situ deposition method on the surface of Fe foil. Various contents of precursor methane gas were deposited over a mild iron foil substrate and formed different composites. It was found that the incorporation of C into the Fe matrix led to a thin film on the surface of the matrix and produced an anti-corrosion effect. Electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and potentiometric tests were used to compare the corrosion behaviors of the films in air-saturated 3.5 wt.% NaCl solution. According to the results, Fe-oxide- and C-composite-coated iron foil has a much higher corrosion resistance than the raw blank sample without the addition of C. Generally, the corrosion charge transfer resistance of one kind of iron oxide coated with carbon layers of several nanometers was enhanced up to 28,379 times (Rct changes from 1487 Ω cm2 to 4.22 × 107 Ω cm2), which is the biggest improvement so far. The maximum protection efficiency was obtained for the in situ grown coating prepared by 10 and 15 sccm CH4 precursor gas (eta = 100%). In conclusion, an iron oxide and carbon composite was found to be a great candidate for applications in the corrosion-resistance area.

RE(III) 3-Furoate Complexes: Synthesis, Structure, and Corrosion Inhibiting Properties.

In this study, two types of Rare Earth (RE) 3-furoate complexes were synthesized by metathesis reactions between RE chlorides or nitrates and preformed sodium 3-furoate. Two different structural motifs were identified as Type 1RE and Type 2RE. The Type 1RE monometallic complexes form 2D polymeric networks with the composition [RE(3fur)3(H2O)2]n (1RE = 1La, 1Ce, 1Pr, 1Nd, 1Gd, 1Dy, 1Ho, 1Y; 3furH = 3-furoic acid) while Type 2RE bimetallic complexes form 3D polymeric systems [NaRE(3fur)4]n (2RE = 2Ho, 2Y, 2Er, 2Yb, 2Lu). The stoichiometric mole ratio used (RE: Na(3fur) = 1:3 or 1:4) in the metathesis reaction determines whether 1RE or 2RE (RE = Ho or Y) is formed, but 2RE (RE = Er, Yb, Lu) were obtained regardless of the ratio. The corrosion inhibition behaviour of the compounds has been examined using immersion studies and electrochemical measurements on AS1020 mild steel surfaces by a 0.01 M NaCl medium. Immersion test results revealed that [Y(3fur)3(H2O)2]n has the highest corrosion inhibition capability with 90% resistance after 168 h of immersion. Potentiodynamic polarisation (PP) measurements also indicate the dominant behaviour of the 1Y compound, and the PP curves show that these rare earth carboxylate compounds act predominantly as anodic inhibitors.

Corrosion Inhibition studies of poly (N-tert-amylacrylamide -co- N-phenyl acrylamide) copolymers by EIS and PDP methods

Herein, we reported the synthesis and corrosion inhibition studies of poly (N-tert- amylacrylamide-co- N-phenyl acrylamide) copolymers. The copolymers are synthesized by free radical polymerization using NTA and NPAM monomers . The synthesized copolymers are subjected to corrosion inhibition behavior by EIS and PDP methods. Both the methods showed same results of 85.0 percentage of inhibition

Insight into the anti–corrosion behavior of Reineckia Carnea leaves extract as an eco–friendly and high–efficiency corrosion inhibitor

This study presents an eco–friendly and high–efficiency corrosion inhibitor for carbon steel in 1 M hydrochloric acid (HCl) extracted from Reineckia carnea . Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PD) were conducted to evaluate the anti–corrosion performance of Reineckia carnea extracts (RCE) for carbon steel in HCl at 298 K∼328 K. The RCE achieved a maximum corrosion inhibition efficiency of 95.5 % at 308 K. Fourier transform infrared spectroscopy (FTIR) and ultra–performance liquid chromatography with quadrupole–time–of–flight mass spectrometry (UPLC–Q–TOF–MS) were also used on RCE to determine its main chemical composition. Furthermore, scanning electron microscopy (SEM) was utilized to observe the corrosion inhibition behavior of RCE on carbon steel on a microscopic scale. The results show that the adsorption type of RCE on carbon steel obeys the Langmuir adsorption isotherm model. The free energy ∆ G ads 0 was calculated to be − 19.85 kJ/mol based on the adsorption isotherm model, indicating that RCE is physical adsorption on the carbon steel surface. The data obtained by DFT and MD simulations are consistent with the electrochemical experimental results and demonstrate the excellent inhibition performance of RCE on carbon steel in HCl solution. This study provides valuable insight into the development of green corrosion inhibitors for carbon steel. • Reineckia carnea extract (RCE) acted as green corrosion inhibitor for carbon steel in HCl solution. • Potentiodynamic polarization (PD) studies revealed that RCE acted as a mixed-type inhibitor. • The data obtained by DFT and MD simulations are consistent with the electrochemical experimental results.

Evaluation of the corrosion inhibition behavior of N, S co-doped memory-type carbon dots for mild steel in HCl solution

Novel N, S co-doped carbon dots (N, S-CDs) with memory effect were prepared by hydrothermal method using citric acid and l-cysteine as precursors. Structural and morphological characterizations confirmed that N, S-CDs are carbon dots with multifunctional groups and excellent water solubility. Electrochemical measurements indicated that N, S-CDs can effectively inhibit the charge transfer in the corrosion process of steel, and the inhibition efficiency is nearly 90%. The obtained N, S-CDs exhibits outstanding inhibition performance for steel corrosion, which offers a new thought for exploring environmentally friendly corrosion inhibitors.

Evaluating the synergistic effect of maple leaves extract and iodide ions on corrosion inhibition of Q235 steel in H2SO4 solution

In recent years, many plant extracts have been used as green corrosion inhibitors to replace traditional corrosion inhibitors, but their inhibition performance still needs to be improved. The synergistic corrosion inhibition behavior and mechanism of maple leaves extract (MLE) and potassium iodide (KI) on Q235 steel in 0.5 M H2SO4 solution were firstly investigated in this work. The results demonstrate that both MLE and KI can prevent the corrosion of steel in corrosive media, and that their combined protection effect is superior. The corrosion inhibition efficiency (η) value reaches 93.4 % in corrosive solution with the combination of 200 mg/L MLE and 200 mg/L KI, while the maximum of η is only 81.6 % using MLE alone. In addition, Fe-N bond and Fe-O bond were found on the steel surface through the X-ray photoelectron spectroscopy (XPS) analysis, which confirm the formation of a protective film. The adsorption behavior of an inhibitory film composed of MLE and KI mixtures onto steel surface follows the Langmuir adsorption isotherm model, consisting of physisorption and chemisorption. Finally, molecular dynamics (MD) simulation indicates that inhibitor molecules can adsorb on the Fe substrate in a parallel way with high binding energy values, which supports the experiments well.

Synthesis and characterization of phenolphthalein derivatives, detailed theoretical DFT computation/molecular simulation, and prevention of AA2024-T3 corrosion in medium 3.5% NaCl

BackgroundAluminum alloy corrosion prevention is a significant problem in the industry. The development of an effective protection strategy is a popular research area. In this work, two organic inhibitors phenolphthalein (P1) and (3-oxo-1, 3-dihydroisobenzofuran-1,1-diyl)bis(4,1-phenylene) bis(4-methyl benzenesulfonate) (P2) were used in 3.5% NaCl medium for alloy AA2024-T3 corrosion mitigation. Corrosion inhibition behavior was investigated by a combination of experimental and theoretical studies. MethodsThe surface morphology of AA2024 -T3 has been identified by scanning electron microscopy coupled with Energy Dispersive X-Ray Spectroscopy (SEM/EDS), and Infrared spectroscopy (FT-IR) confirms the adsorption of functional groups on the surface of the aluminum alloy. Furthermore, the adsorption energies of P1 and P2 on Aluminium (111) interfaces were computed by Molecular Dynamics (MD), and quantum chemical computations (density functional theory, DFT) were chosen for obtaining basic electronic/atomic-scale details about the compound adsorption on target alloy aluminum and their active sites. Significant findingsThe effect of two organic inhibitors phenolphthalein (P1) and (3-oxo-1, 3-dihydroisobenzofuran-1,1-diyl)bis(4,1-phenylene) bis(4-methyl benzenesulfonate) (P2) on the corrosion protection of Aluminium alloy in 3.5% NaCl solution was examined using electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PPD) methods. The Total polarization resistance (RTot) increased, and the corrosion current density declined with the increasing inhibitor concentration. Inhibition efficiency revealed the maximum value of 85% for the P1 and 93% for P2 at 10−4 M, respectively. the two inhibitors were categorized as mixed-type inhibitors since they inhibited both cathodic and anodic corrosion.

Corrosion inhibition behavior of hydroxyl-terminated hyperbranched poly(amine-ester) for Q235 steel in HCl solution

Herein, we reported to use a hydroxyl-terminated poly(amine-ester) hyperbranched polymer (HPAE-OHs) as a green, effective and economic corrosion inhibitor for mild steel (Q235) in 1 M HCl solution. HPAE-OHs is a third generation hyperbranched polymer which can be synthesized through a simple “one-pot” solvent-free esterification. Weight-loss tests show that the presence of HPAE-OHs can inhibit the corrosion of Q235 and the corrosion inhibition efficiency (η (%)) can reach 94.9% at the dosage of 100 mg L−1 for 24 h. The study of the adsorption thermodynamic indicates that the adsorption of HPAE-OHs on the surface of Q235 steel follows Langmuir adsorption isotherm model. Polarization measurements and electrochemical impedance spectroscopy (EIS) suggest that HPAE-OHs works as a mixed-type inhibitor, which forms a layer of protective film on the metal surface to prevent metal corrosion. Moreover, theoretic studies further indicate that the corrosion inhibition is the result of the strong adsorption of HPAE-OHs inhibitor on Q235 steel surface. All these results clearly show that the synthesized hyperbranched polymer HPAE-OHs is an efficient corrosion inhibitor for steel and has a great application potential in industrial metal anticorrosion.

Synthesis and Corrosion Inhibition Potential of Cerium/Tetraethylenepentamine Dithiocarbamate Complex on AA2024-T3 in 3.5% NaCl.

In this work, a cerium/tetraethylenepentamine dithiocarbamate complex was synthesized and evaluated for the corrosion inhibition capability on an AA2024-T3 Al alloy in a 3.5% NaCl medium. The synthesized compounds were characterized via spectroscopic techniques. The corrosion inhibition behaviour of the complex was elucidated by electrochemical measurements and surface analysis techniques. Based on electrochemical test results, the corrosion inhibition efficiency of the complex increases with the immersion time of aluminium alloy in the test solution. The corrosion inhibition reaches 96.80% when the aluminium is immersed in a 3.5% NaCl solution containing a corrosion inhibitor for 120 h. The potentiodynamic polarization test results show that the complex acts as a mixed-type corrosion inhibitor and the passive range is widened. The surface analysis methods reveal that the corrosion inhibition ability of the complex originated from the formation of a protective layer on the Al surface. This film is created from the physisorption and chemisorption of cerium ions and organic parts simultaneously released from the complex molecules.

Corrosion Inhibition of Low Carbon Steel in Soil Solutions, Using Novel Schiff Base Inhibitor

The investigation of Corrosion inhibition behavior of synthesized amino acid-based Schiff base inhibitor [(E)-5-nitro-N1-((E)-3-phenylallylidene) benzene-1,2-diamine] was carried out. Its adsorption in two types of (5%) soil solutions was studied at room temperature, using potentiodynamic polarization and gravimetric techniques. The inhibition efficiency obtained at the optimum inhibitor concentration (300ppm), were 23% in acidic and 70% in neutral electrolyte. Results illustrated that the inhibitor worked well in less acidic environment in one of the soil solutions which was relatively acidic than the other. Experimental data of potentiodynamic study also indicated that the inhibitor was more inclined to adsorb on the anodic sites of the carbon steel sample, thus the inhibitor can be categorized as the anodic inhibitor due to suppression of more anodic reaction on the carbon steel sample.

Studies on pyrimidine derivative as green corrosion inhibitor in acidic environment: Electrochemical and computational approach

Present investigation describes the green corrosion inhibition and adsorption behaviour of two synthesized pyrimidine derivatives, namely, 6,6′-(1,4-phenylene)bis(4-oxo-2-thioxo-1,2,3,4-tetrahydropyrimidine-5-carbonitrile) (POTC) and 6,6′-(1,4-phenylene)bis(5-chloro pyrimidine-2,4(1 H,3 H)-dione) (PCPD) on mild steel in 15% HCl environment. The corrosion inhibition capability of the synthesised inhibitors was measured with the help of weight loss & electrochemical techniques. The corrosion inhibition efficiency measured by the weight loss experiment for the POTC and PCPD inhibitor at 200 ppm concentration & 303 K temperature was 96.9% and 93.3%, respectively. Both inhibitors obey Langmuir adsorption isotherm and mixed (physisorption as well as chemisorption) nature of adsorption because the magnitude of free energy of adsorption for both inhibitors lies in the range of − 35.99 to − 37.93 kJmol−1. The results of Tafel polarization notified that both inhibitors suppressed the rate of cathodic and anodic corrosion reactions and designated as mixed type inhibitor. The observations of FESEM, EDX, AFM, and XPS suggested the formation of protective film of inhibitor on mild steel surface. The computational investigations (DFT & MCS) well support the experimental outcomes of both inhibitors.

ELECTROCHEMICAL AND COMPUTATIONAL STUDY OF CORROSION INHIBITION OF MILD STEEL USING CEFUROXIME DRUG AS AN INHIBITOR.

The corrosion inhibition behavior of cefuroxime was investigated on mild steel in 2 M H2SO4 solution using electron impedance spectroscopy measurement and Quantum chemical studies. The inhibitive effects of the studied compound increase with increasing concentration and the study revealed that cefuroxime is a mixed-type corrosion inhibitor and the Quantum chemical studies corroborate experimental results.

Corrosion inhibition behavior of the synthesized pyrazoline-sulfonamide hybrid of mild steel in aqueous solutions: experimental and quantum investigations

Corrosion inhibition behavior of the synthesized pyrazoline-sulfonamide hybrid of mild steel in aqueous solutions: experimental and quantum investigations