Corrosion Inhibition Behavior Research Articles

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

Electrochemical and computational investigation of adsorption and corrosion inhibition behaviour of 2-aminobenzohydrazide derivatives at mild steel surface in 15% HCl

The anti-corrosion behaviour of synthesized 1-(2-(5-mercapto-4-phenyl-4H-1,2,4-triazole-3-yl)phenyl)-3-phenylthiourea (MTPT) and 1-phenyl-3-(2-(5-(phenylamino)-1,3,4-thiadiazol-2-yl)phenyl)thiourea (PDPT) were examined by weight loss and electrochemical approaches for the oil well and pipeline steel tube (mild steel) in 15% HCl solution. The output of inhibition efficiencies from weight loss analysis at 303 K temperature and 100 ppm concentration of PDPT and MTPT inhibitor in 15% HCl solution was 97.7 and 94.3%, respectively. The electrochemical studies results well approve the weight loss results. Polarization studies suggested that both inhibitors control the anodic as well as cathodic reactions and act as mixed type inhibitor. The adsorption studies indicate, both inhibitors obey Langmuir adsorption isotherm through mixed adsorption (physisorption as well as chemisorption) process. The formation of organic-inorganic film on the mild steel (MS) surface was investigated by FESEM and AFM studies whereas the composition of the film was investigated by EDX and XPS studies. The theoretical justification of the experimental results was studied through DFT and Monte Carlo simulation (MCS) analysis.

Corrosion inhibition behavior of cerium salt sealing on the scratch of aluminum alloy anode oxide film in a simulated marine atmospheric environment

The anodic oxide film of aluminum alloy was sealed by cerium salt, and the scratch test was used to simulate the damage of the oxide film. The repair and corrosion inhibition effects of cerium in the oxide film on the simulated damaged site were studied by means of alternate immersion accelerated corrosion test, combined with scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and electrochemical techniques. The results show that cerium in the undamaged oxide film diffused to the scratch and existed in the form of Ce (III) and Ce (IV), and formed the hydroxide with the cathode reaction product OH− in the scratch. It was only when enough corrosion products were produced on the aluminum matrix in the scratch, both the corrosion products and the hydroxide of cerium would have a synergistic effect on inhibiting the cathode reaction, thus, cerium salt could play the role of corrosion inhibition.

Synergistic control of wetting resistance and corrosion inhibition by cerium to enhance corrosion resistance of superhydrophobic coating

Superhydrophobic coatings have attracted significant attention in the anti-corrosion protection. However, their long-term corrosion resistance is still challenging under the penetration of corrosive media. In this work, we report an one-step electrodeposition method to fabricate a cerium-based superhydrophobic (CS) coating on the surface of Al alloy. The effects of cerium ions on the morphology, roughness, anti-wettability and anti-corrosion property of the coatings were investigated in detail. The results indicated that cerium ions can effectively control the anti-wetting properties of the coating surface by regulating surface micro/nanostructure during electrodeposition process. The obtained CS coating has the best corrosion protection when the cerium ion concentration is 0.0125 mol/L, and its impedance modulus changes slightly, reaching 3.16 × 106 Ω cm2 after immersing in 3.5 wt% NaCl solution for 192 h. Notably, the CS coating could form a Ce-rich passive layer during the immersion to prevent further corrosion, exhibiting excellent long-term corrosion resistance. Consequently, cerium ions can enhance the corrosion inhibition behavior of such coating through the synergistic effect of regulating the surface micro/nanostructure and the active inhibition of cerium.

Corrosion inhibition behavior of electrochemically synthesized carbon dots on Q235 carbon steel

Carbon dots (CDs) are spherical zero-dimensional carbon nanomaterials, generally below 10 nm in size, which have received increasing attention in the field of corrosion because of various advantages such as good water solubility, abundant raw materials, and environmental protection. In this work, water-soluble carbon dots (CDs) with particle sizes of 5–10 nm are obtained by electrochemical oxidation with anhydrous ethanol. FTIR, Raman, UV–Vis, XPS, and TEM are used to characterize the obtained CDs, and electrochemical tests are used to investigate the anti-corrosion performance of the CDs. The results reveal that the corrosion inhibition performance increased with the addition of CDs, and the highest corrosion inhibition efficiency reaches 98% when the addition amount is 200 mg/L. Moreover, the inhibition mechanism for CDs needs to be further investigated, and the stable adsorption of CDs on carbon steel to form adsorption film may be the key factor for its good corrosion inhibition performance.

Performance of cross-linked polymers as a potential anticorrosive coating for low carbon steel in acidic condition: Experimental and computational studies

• Polyethylenimine (PEI) with three different epoxies were evaluated as potential corrosion inhibitors. • The corrosion resistance performances of PEIs were revealed with several electrochemical tests. • SEM and AFM show extraordinary surface adsorption performances by PEIs. • Linear PEI showed better corrosion protection as compared to branched PEI. Polyethylenimine (branched and linear) cross-linked coatings were studied for Low Carbon Steel (LCS) corrosion protection in 2 M sulfuric acid corrosive media. Three epoxies namely 4,4′-methoxy (N,N-diglycidyl anisole) (ER1), 4,4′-methylene (N,N-diglycidyl aniline) (ER2), and Diglycidyl 1,2-cyclohexanedicarboxylate (ER3) have been used to produce different cross-linked coating materials with polyethylenimine branched (PEIB) and polyethylenimine linear (PEIL). Our aim was to investigate and find the best surface protective materials among the studied crosslinked polymers. Weight-loss, potentiodynamic polarization techniques including electrochemical impedance spectroscopy were used to conclude the corrosion inhibition behavior of the cross-linked polymeric coatings in 2 M H 2 SO 4 solution. Electrochemical analysis suggested that the sample PEIL-ER3 (cross-linked polymer) has better corrosion inhibition performance as compared to the other studied samples. After assessment of the electrochemical investigation, the inhibitory action of PEIB-ER1, PEIB-ER2, PEIB-ER3, PEIL-ER1, PEIL-ER2, and PEIL-ER3 at 303 K was found to be approximately 68%, 79%, 89%, 72%, 84%, and 92%, respectively. Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) revealed that the substrate coated with PEIL-ER3 showed less corroded surfaces as compared to the substrates coated with the other studied samples. Fourier Transform Infrared Spectroscopy-Attenuated Total Reflection (FTIR-ATR) investigated the surface characterization of the LCS. The obtained results verify the surface adsorption of the LCS by the studied cross-linked polymer materials.

Environmental Remediation through Catalytic Inhibition of Steel Corrosion by Schiff’s Bases: Electrochemical and Biological Aspects

The environmental impact of corrosion is very dangerous and consumes much of world’s efforts and funds. This work discusses the safeguarding of the environment, metals, and metal-infra structures by efficient Schiff’s base inhibitors. The corrosion inhibitors [(1E,3E)-N1,N3-dibutyl-1-(thiophen-2-yl)butane-1,3-diimine] (GSB-I) and [(1Z,3Z)-N1,N3-bis(4-methylhexan-2-yl)-1-(thiophen-2-yl)butane-1,3-diimine] (GSB-II) were successfully synthesized and evaluated for the protection of API 5L X65 steel (CS) in 1 M HCl media using electrochemical techniques, SEM/EDS, and quantum chemical calculations. GSB-I and GSB-inhibitory I’s efficiency is proportional to the concentration of the test. In the presence of 1 mM GSB-I and GSB-II, the maximum inhibitory efficiency was determined to be 90.6 and 93.8 percent, respectively. According to potentiodynamic polarization tests, the two compounds are effective inhibitors of mixed-type corrosion. The physisorption and chemisorption of both inhibitors followed the Langmuir adsorption isotherm on CS surfaces. The biological reactivity of both GSB has been examined, and encouraging results have been obtained as antifungal, antibacterial, and biocidal agents against sulfate-reducing bacteria (SRB). In addition, using DFT calculations and molecular dynamic (MD) simulation, the effect of GSB-I and GSB-II molecular configuration on corrosion inhibition behavior in acidic environments was investigated.

Corrosion inhibition and adsorption behavior of (3-aminopropyl)-triethoxysilane on steel surface in the simulated concrete pore solution contaminated with chloride

The absorption behavior of (3-aminopropyl)-triethoxysilane (APS) as a new electrochemical migration reinforcement corrosion inhibitor in different simulated concrete pore (SCP) solutions contaminated with chloride was investigated by electrochemical measurement and surface analysis (X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and scanning electron microscopy). The effects of temperature and absorption isotherm were investigated to determine the interaction between APS and the steel surface. In uncarbonated saturated Ca(OH)2 SCP solution, APS is mainly physically absorbed on the steel, while chemical absorption and physical absorption probably occur simultaneously in carbonated SCP solution containing NaHCO3/Na2CO3. The surface analysis confirmed that APS can absorb on the steel surface through N atoms and higher N 1s binding energy of APS in NaHCO3/Na2CO3 SCP solution suggests that there may be coordination bonds. The different absorption mechanisms of APS on reinforcement surface in various SCPs can explain the varying inhibition efficiency and stability of APS in medium with different alkalinity.

Newly Synthesized Morpholinyl Mannich Bases as Corrosion Inhibitors for N80 Steel in Acid Environment.

New Mannich bases, 3-morpholino-1-phenylpropan-1-one (MPO) and 3-morpholino-1-phenyl-3-(pyridin-4-yl) propan-1-one (MPPO), were synthesized, characterized, and studied as corrosion inhibitors for N80 steel in 1 M hydrochloric acid (HCl) solution using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and FT-IR spectroscopy. The inhibition efficiency increases with increasing inhibitor concentrations, and the corrosion inhibition efficiency of the MPO and MPPO could reach 90.3% and 91.4%, respectively, at a concentration of 300 ppm at 305 K. The effect of the temperature on the corrosion inhibition behavior of inhibitors was discussed. Electrochemical tests showed that the synthesized inhibitors are mixed. The EIS test results showed that the presence of MPO and MPPO reduced the double-layer capacitance in the corrosion process, thereby reducing the charge transfer resistance. The SEM and EDX results showed that the MPO and MPPO formed a uniform adsorption film on the surface of the N80 steel. The adsorption mechanism of the inhibitors was simulated with different adsorption models and the results showed that the inhibitors were the chemisorbed type. The results of the FT-IR spectroscopy proved that the inhibitor interacted with metal atoms on the steel surface.