Synergistic Corrosion Inhibition Effect Research Articles

Synergistic inhibition effect of thioureido imidazoline and cationic surfactants with different alkyl chain lengths on X80 carbon steel in CO2-satureted NaCl solutions

The corrosion inhibition performance of the thioureido imidazoline (TU-IM) corrosion inhibitor, along with three surfactants, was assessed for X80 carbon steels in a CO2-saturated NaCl solution using weight loss tests, electrochemical and microstructural characterization. Results demonstrate that the corrosion-inhibition efficiency of surfactants improves with increasing alkyl-chain length in the following order: cetyltrimethylammonium bromide (CTAB) > tetradecyltrimethylammonium bromide (TTAB) > dodecyltrimethylammonium bromide (DTAB). A synergistic corrosion inhibition effect between TU-IM and DTAB/TTAB was observed, with the best performance achieved using 10mg/L TU-IM and 10mg/L DTAB/TTAB (inhibition efficiency: 97.68%), which is mainly attributed to the cooperative adsorption of both substances. By contrast, the synergistic inhibition capability of TU-IM with the surfactants decreased as the alkyl-chain length increased, and even an antagonistic effect was noted for the combination of TU-IM + CTAB owing to the competitive adsorption between the surfactant and the corrosion inhibitor.

Enhancing corrosion inhibition performance of benzyl quinolinium chloride by the use of allicin in lactic acid

The synergistic inhibitive effect of benzyl quinolinium chloride (BQC) with allicin on N80 specimens in 15 % lactic acid environment at 363 K was investigated using weight loss experiments, electrochemical tests, and surface analysis techniques (including scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray Photoelectron Spectroscopy (XPS), and contact angle measurement), quantum chemical calculation as well as molecular dynamics (MD) simulation instruments. In the presence of allicin, the inhibition performance of BQC was significantly improved. The inhibition efficacy (IE) reached 96.49 % at the optimal mass ratio of 5:1(BQC/allicin) with the total inhibitor mass fraction of 0.1 %. Electrochemical testing demonstrated that the composite inhibitor impeded the corrosion process and the composite corrosion inhibitor was belong to hybrid inhibition type. Surface analysis techniques indicated that the composite corrosion inhibitor formed a hydrophobic adsorptive protective film to avoid the erosion of corrosion factors on the metal surface. The mechanism of the synergistic corrosion inhibition effect was further clarified, in terms of electrostatic attraction, intermolecular interactions and adsorption process through molecular dynamics simulation (MD) as well as density functional theory (DFT). The composite corrosion inhibitor composed of BQC and allicin formed a complete and dense adsorption protective film on the metal surface under the combined effect of physical and chemical adsorptions. The combination of BQC and allicin in proper ratio shows promising application potential as an efficient corrosion inhibitor in lactic acid based acidizing fluids.

Synergistic corrosion inhibition effect of N-benzyl pyridinium chloride and three cationic surfactants in the H2S/CO2/NaCl solution

The investigation into the synergistic corrosion inhibition effects of N-benzyl pyridinium chloride (BPC) and three cationic surfactants (i.e., dodecyl trimethyl ammonium bromide, tetradecyltrimethyl ammonium bromide and cetyltrimethyl ammonium bromide) in H2S/CO2/NaCl solution was conducted using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy, scanning electron microscopy, surface tension and X-ray photoelectron spectroscopy. Corrosion inhibition efficiencies of these surfactants correlated to their surface activity levels. Notably, the addition of BPC significantly improved the protective effectiveness of surfactants, demonstrating a strong synergistic inhibitory impact. The enhancement is attributed to the co-adsorption of the surfactants with BPC, which effectively covers the flaws in BPC adsorbed layer. This increases the overall coverage of inhibitive film, thereby offering high inhibition efficiencies for carbon steel in the tested environment.

The influence of cyclodextrin on hydrophobicity of pipeline and asphalt distribution: A green and efficient corrosion inhibitor

Corrosion inhibitors face significant limitations due to their non-degradability and poor applicability to asphalt systems. The molecular simulation studies show that cyclodextrin (CD) and asphalt can form supramolecular corrosion inhibitors with pipeline hydrophobic modification and corrosion inhibition effects. In particular, the rich hydroxyl structure of CD enables it to stably bind to the pipeline by forming coordination bonds and feedback bonds. When 2 CD molecules are added, the initial wetting time of the emulsion is delayed by 257.81 % compared to Span 80 with the same mass fraction. When 4 CD molecules are added, the emulsion cannot wet the iron surface within the simulation time. Furthermore, the combination of CD and asphalt allows more than 90 % of the asphalt to emulsify and prevent the emulsion from spreading on the pipeline. This results in a synergistic corrosion inhibition effect. These findings suggest that CD-based supramolecular corrosion inhibitors have the potential to be effective and environmentally friendly alternatives to traditional inhibitors in asphalt systems.

Fabrication of Protective Organic Layer Using Schiff-Base Metal Complex Responsible for Excellent Corrosion Performance: Experimental and Theoretical Perspectives.

The effectiveness of a copper(II) complex with a Schiff base derived from 2-amino-4-phenyl-5-methylthiazole and salicylaldehyde (APMS) as a corrosion inhibitor for XC18 steel in an HCl solution was investigated. Experimental findings indicated a slight negative correlation between inhibition efficiencies in 1 M HCl and temperature but a positive correlation with both inhibitor concentration and immersion time, respectively. The weight loss measurement revealed that APMS achieved a maximum inhibition rate of 92.07% at 303 K. A fitting analysis demonstrated that APMS adheres to the Langmuir adsorption isotherm. The electrochemical results revealed an enhanced inhibitive performance of APMS, with the efficiency increasing as concentrations increased, ultimately reaching a peak of 94.47% at 5 × 10-3 mol L-1. Potentiodynamic polarization measurements revealed that APMS acted as a mixed-type inhibitor without affecting the corrosion mechanism. Scanning electron microscopy investigations of the metal surfaces corroborated the presence of an adsorbed organic layer. Advanced theoretical calculations utilizing density functional theory and first-principles density-functional tight-binding were conducted to gain insights into the behavior of APMS on the metal surface. APMS derives its advantages from crucial inter- and intramolecular interactions, resulting in the formation of a resilient adsorption layer, in line with the experimental findings. It is found that the presence of the APMS-based inhibitor exhibits a significant synergistic corrosion inhibition effect. The current study offers a design direction for enhancing the structural characteristics of Schiff base metal complexes, laying the groundwork for multifunctional frameworks to minimize corrosion rates with considerations for real-world use and cost-efficiency. The ability to replace harmful, expensive constituents with sustainable, and cost-effective organic alternatives represents a significant outcome of this study.

Electrochemical and surface analysis investigation of corrosion inhibition performance: 6-Thioguanine, benzotriazole, and phosphate salt on simulated patinas of bronze relics

Organic heterocyclic corrosion inhibitors play a crucial role in the non-destructive protection of excavated bronze relics exposed to the atmosphere. However, the current selection of corrosion inhibitors, additives, and dosage requires further investigation. This study involves a comprehensive preparation simulation of electrode materials and atmospheric corrosion electrolytes. The corrosion inhibition performance of 6-thioguanine (6-Tg) and traditional benzotriazole (BTA) inhibitors at pH = 7.5 is explored. Analytical techniques such as potentiodynamic polarization, EIS, XRD, XPS, and SEM-EDS were employed to analyze the characteristics of the research electrode materials. Surface analysis reveals that 6-Tg forms a protective corrosion inhibition film on the surface of the covered patina electrode, influencing the transition of Cu2(OH)3Cl to the more stable Cu2(OH)2CO3 crystal. Electrochemical results demonstrate that, after 600 h in the corrosion solution containing 0.1 g/L of 6-Tg, the corrosion potential and corrosion current reach 0.244 V and 4.9 μA cm−2, respectively. Upon adding 1.2 g/L of NaH2PO4, the polarization resistance and inhibiting efficiencies reach 15.6 kΩ cm2 and 99%, resulting in a synergistic corrosion inhibition effect and passivation potential shift from −0.6 V to 0.2 V region.

Evaluation of corrosion inhibition efficiency of chitosan oligosaccharide-derived quaternary ammonium vanillyl aldehyde oligosaccharide derivative for CO2 corrosion control

This study presents the synthesis of a non-toxic, water-soluble chitosan oligosaccharide derivative, quaternary ammonium vanillyl aldehyde oligosaccharide (GCOS), using chitosan oligosaccharide, vanillin, and 2,3-epoxypropyltrimethylammonium chloride as precursors, aimed at serving as a novel eco-friendly corrosion inhibitor. The successful synthesis of the derivative was confirmed through Fourier Transform Infrared Spectroscopy (FTIR) and Proton Nuclear Magnetic Resonance (1H NMR) analysis. The corrosion inhibition properties of GCOS on 20# carbon steel were investigated in a 60 °C CO2-saturated 3.0 wt% NaCl solution employing an array of methods including weight loss measurements, Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), electrochemical characterization, and molecular dynamics simulation. Additionally, the synergistic effect of protonated GCOS with halide ion Cl- on corrosion inhibition was analyzed at the molecular level. The results indicated an enhancement in inhibition efficiency with increasing concentrations of the inhibitor. Weight loss measurements showed a maximum inhibition efficiency of 90.9% at 200 ppm of GCOS after 3 days. The adsorption of GCOS on the carbon steel surface was found to follow the Langmuir adsorption isotherm, predominantly through chemisorption. Potentiodynamic polarization measurements classified GCOS as a mixed-type inhibitor, affecting both anodic and cathodic reactions by blocking the active corrosion sites. SEM and AFM analyses confirmed the formation of a protective inhibitor film on the metal surface. Furthermore, molecular dynamics simulations elucidated the synergistic corrosion inhibition effect between the protonated GCOS molecules and Cl- ions in the acidic solution.

Synergistic mechanism of ternary green corrosion inhibitors for N80 steel in 20 wt% HCl solution: Encapsulation and transportation of vanillin through micelles formed by ionic liquids

The encapsulation and directional transport to iron surface of green and poorly water-soluble vanillin were achieved by self-assembled micelles of ionic liquids formed by 1-hexadecyl-2,3-dimethyl imidazolium bromide and sodium dodecyl benzene sulfonate. The anti-corrosion performance of the system for N80 steel in 20 wt% hydrochloride solution at 90 ℃ was studied by weight-loss method, electrochemical tests, and surface analysis. The reaction activity of corrosion inhibitors and self-assembled film formation mechanism at high temperature were revealed by quantum chemistry and molecular dynamics simulation. The results shows that the system exhibits excellent synergistic corrosion inhibition effect via hydrogen bond, electrostatic interaction, and hydrophobic effect.

Molecular Dynamic Simulation on the Synergistic Corrosion Inhibition Effect and Mechanism of Quinoline Quaternary Ammonium Salt and L-Methionine

Molecular Dynamic Simulation on the Synergistic Corrosion Inhibition Effect and Mechanism of Quinoline Quaternary Ammonium Salt and L-Methionine

Synergistic corrosion inhibition effect of copolymer and an amphoteric surfactant on carbon steel in 3.5 NaCl solution: experimental and theoretical research

Synergistic corrosion inhibition effect of copolymer and an amphoteric surfactant on carbon steel in 3.5 NaCl solution: experimental and theoretical research

Corrosion inhibition performance of polyolefin smart self-healing composite coatings modified with ZnO@β-Cyclodextrin hybrid particles

Corrosion is a global problem that results in substantial economic loss and is life-threatening as well. Currently, the utilization of self-healing coatings involving smart carriers encapsulated with the appropriate self-healing agents is a topic of great interest. Following this strategy, our work reports the synergistic corrosion inhibition performance of polyolefin-based smart coatings containing modified hybrid-based particles. The hybrid particles (ZnO@β-CD) comprising zinc oxide (ZnO) and β-Cyclodextrin (β-CD) were synthesized and modified with 2-mercaptobenzothiazole (2-MBT). The synthesized unmodified and modified hybrid particles were characterized by numerous techniques. TGA analysis confirmed that 2MBT was effectively loaded into ZnO@β-CD with almost 43% loading. UV-vis spectroscopic analysis results suggested that the self-release behavior of 2MBT is more pronounced in the acidic environment compared to the basic and neutral environment due to the dissociation of ZnO in the acidic environment. In the next stage, the synthesized unmodified (ZnO@β-CD) and modified (ZnO@β-CD-2MBT) hybrid particles were reinforced into a polyolefin matrix, followed by its application on steel substrate via dip-coating technique to formulate smart composite coatings. The Electrochemical impedance spectroscopy (EIS) results conducted on the developed smart composite coatings demonstrated that polyolefin coatings reinforced with modified hybrid particles (ZnO@β-CD-2MBT) displayed improved corrosion inhibition performance (98 GΩ cm2) as compared to the composite coatings (87 GΩ cm2) containing unmodified particles ((ZnO@β-CD) in 0.56 M NaCl solution after 20 days of immersion. This decent improvement in corrosion resistance behavior is attributed to the synergistic corrosion inhibition effect experienced due to the combined corrosion inhibition effect of ZnO and 2MBT.

Tailoring of Biodegradable Magnesium Alloy Surface with Schiff Base Coating via Electrostatic Spraying for Better Corrosion Resistance

In this study, three new Schiff bases were synthesized from paeonol and amino acids to prepare a compound Schiff base coating on the Mg-Zn-Y-Nd alloy (ZE21B alloy) surface by electrostatic spraying, and these three single Schiff base coatings were prepared on the ZE21B alloy as control. The results of SEM and XPS confirmed the successful preparation of the coating. Immersion tests and electrochemical tests showed that both the single coating and the compound coating significantly improved the corrosion resistance of ZE21B alloy, and the compound coating could play a synergistic corrosion inhibition effect, thus showing the best corrosion resistance.

Novel 1, 3, 5‐triazine derivative is a highly efficient inhibitor of corrosion of Q235 carbon steel in an acidic medium

AbstractA novel triazine derivative, 2, 4‐diamino‐6‐dodecamido‐1, 3, 5‐triazine (DT), is synthesized by the dehydration condensation of melamine and lauric acid, and its inhibitive performances for the corrosion of Q235 carbon steel in 1 mol/L HCl solution is investigated by electrochemical polarization, electrochemical impedance spectroscopy, scanning electron microscopy, and atomic force microscope. The results reveal that its best inhibition efficiency reaches 96.98% at a concentration of 2.5 g/L. The calculation results of kinetic and thermodynamic parameters indicate that the adsorption of DT on carbon steel surface obeys Langmuir adsorption isotherm with both physical and chemical adsorption. It is demonstrated that long‐chain amide (>8C) substituted 1, 3, 5‐triazine derivative has the synergistic corrosion inhibition effect of the surface fixation on metal iron and the hydrophobic adsorption layer.

Study on the Synergistic Corrosion Inhibition Effect between Sodium Silicate and Triethanolamine for 45 Steel Corrosion in 3.5% NaCl solution

Study on the Synergistic Corrosion Inhibition Effect between Sodium Silicate and Triethanolamine for 45 Steel Corrosion in 3.5% NaCl solution

In-depth insight into the synergistic inhibition mechanism of S-benzyl-L-cysteine and thiourea on the corrosion of carbon steel in the CO2-saturated oilfield produced water

Mixing is an effective strategy to improve the inhibition performance of corrosion inhibitors based on their synergistic effect. In this work, the synergistic inhibition effect of S-benzyl-L-cysteine (SBLC) and thiourea (TU) on the corrosion of carbon steel in the CO2-saturated oilfield produced water is studied by electrochemical tests and surface analysis. It is found that SBLC and TU exhibit a significant synergistic corrosion inhibition effect. Meanwhile, the synergistic mechanism is in-depth elucidated by theoretical calculations. The intermolecular interaction between SBLC and TU molecules leads to the formation of a more compact and stronger adsorbed film on carbon steel surface.

Sinapis arvensis (Mustard) extract derived bio-molecules linked Zinc-II ions; Integrated electrochemical & surface investigations

One way to diminish the steel corrosion rate and enhance its lifetime in the saline (NaCl-based) solutions is by inserting the plant-sourced organic inhibitor into the aggressive media. However, the plant-sourced organic inhibitor's performance in neutral chloride solutions is not promising, so, the metal cations, i.e. Zinc, were used for aiding the synergistic corrosion inhibition effect. In the current work, mild steel (MS) substrate was inhibited against chloride ions by utilizing different ratios of Sinapis arvensis (Mustard) seed extract (SASE) and Zinc (Zn) combinations.The microstructures of the immersed samples were investigated by FE-SEM, EDS, GIXRD, and AFM analysis. The results affirmed that a protective hybrid film comprising of SASE and Zn was created over the MS surface. The FT-IR test and UV–Visible analysis were utilized for studying the SASE-Zn interaction type and electro-transitions of SASE and SASE:Zn complexes.According to the EIS analysis for the protected sample by 200–600 ppm SASE:Zn complexes, the inhibited samples resistance in front of saline attack (3.5 % sodium chloride) was improved about 85% after 24 h of immersion. Besides, the Tafel curves showed both anodic and cathodic inhibitions against corrosion, confirming the mixed-mode protection where 88% effectiveness was obtained after introducing 200–600 ppm SASE:Zn complexes. Also, the results of morphological analysis displayed the formation of a more smooth protective layer over the MS substrate after adding 200–600 ppm SASE: Zn to the saline solution. On another side, the results of FT-IR and UV–Vis results showed successful interactions between SASE and Zn cations. Furthermore, the outcome of the Raman test illustrated the presence of both D and G bands after SASE: Zn adsorption over the MS substrate.

Study on Synergistic Corrosion Inhibition Effect between Calcium Lignosulfonate (CLS) and Inorganic Inhibitors on Q235 Carbon Steel in Alkaline Environment with Cl.

The synergistic corrosion inhibition effect between calcium lignosulfonate (CLS) and three kinds of inorganic inhibitors (Na2MoO4, Na2SnO3, and NaWO4) with various molar ratios on Q235 carbon steel in alkaline solution (pH 11.5) with 0.02 mol/L NaCl was investigated by cyclic potentiodynamic polarization, electrochemical impedance spectroscopy, linear polarization, scanning electron microscopy, and X-ray photoelectron spectroscopy. Molybdate and stannate in hybrid inhibitor could promote the passivation of steel and form a complex film, which could suppress the corrosion effectively. Moreover, the insoluble metal oxides in the complex film formed by three kinds of inorganic inhibitor could help the adsorption of CLS onto the steel surface. The CLS molecules could adsorb onto the steel surface and metal oxides to form an adsorption film to protect the steel from corrosion. A three-layer protection film formed by a hybrid inhibitor, including passivation film, deposition film, and adsorption film, would effectively inhibit the corrosion reactions on the steel surface. The CLS compound with molybdate with the ratio of 2:3 shows the best inhibition effect on both general corrosion and localized corrosion.

Synergistic Inhibition Effect of Imidazoline and Thiourea: Evidence from Experiments and Molecular Dynamics Simulation

The mass loss method, electrochemical tests, scanning electron microscopy morphology analysis, and molecular dynamics simulation were used to study the synergistic mechanism of imidazoline (IM) and thiourea (TU) on ASTM A106B steel in CO2-saturated NaCl solution. The experimental results clearly revealed that IM and TU had good synergistic corrosion inhibition effect, and the combination of 5 mg/L IM and 5 mg/L TU exhibited the highest inhibition efficiency of 95.1%. Inhibitor molecules replaced the water molecules originally adsorbed on the metal surface and led to inhibition effects. The adsorption of the inhibitor mixtures had a better inhibition effect than individual inhibitors. The adsorption configuration and inhibition performance of the inhibitors demonstrated that the TU molecules first adsorbed on the metal surface to form the first layer, and then the IM adsorbed on TU to form the second layer. The number of water molecules originally adsorbed on the Fe surface decreased, and the diffusion of water molecules in the inhibitor film slowed down, thereby having a synergistic inhibition effect on metal corrosion.

Synergistic Corrosion Inhibition Effect of Rice Husk Extract and KI for Mild Steel in H2SO4 Solution

The corrosion inhibition of rice husk extract for bio-corrosion in mild steel in 1 M of H2SO4 solution and the effect of adding potassium iodide were investigated using the weight-loss method with a variable solution temperature and various bio-inhibitor concentrations. The addition of potassium iodide can significantly increase the efficiency of rice husk extract. The highest efficiency is 95.89% at 1,250 ppm of inhibitor concentration at a temperature of 313 K. The inhibition efficiency of rice husk extract is synergistically increased with the addition of potassium iodide. The characteristics of the adsorption inhibitors were assessed using the Langmuir isotherm adsorption approach at all studied concentrations and temperatures. The synergy of rice husk extract and potassium iodide was examined using thermodynamic and kinetic parameters.

Corrosion Inhibition Performance of Composite Inhibitors for Carbon Steel in Simulated Seawater

Liu, F., 2019. Corrosion inhibition performance of composite inhibitors for carbon steel in simulated seawater. In: Guido-Aldana, P.A. and Mulahasan, S. (eds.), Advances in Water Resources and Exploration. Journal of Coastal Research, Special Issue No. 93, pp. 397–403. Coconut Creek (Florida), ISSN 0749-0208.In this paper, sodium molybdate, sodium tungstate and sodium citrate were selected to compose a series of corrosion inhibitor solutions in different proportions. Their corrosion inhibition effects on standard Q235 carbon steel in simulated seawater were determined by static weightlessness method, polarization curve method and scanning tunneling microscopy (STM), and the corrosion inhibitor formula having better synergistic corrosion inhibition effect with molybdate was determined through experiments. The results show that the concentration of tungstate inhibitor was too high, but the inhibition rate was very low when tungstate and molybdate are combined. When sodium citrate and molybdate were combined and tungstate was added, the corrosion inhibition rate of the composite inhibitor increased obviously, but increased first and then decreased, indicating that there was an optimum ratio between sodium tungstate and sodium citrate, which made the inhibitor have a good synergistic effect. At the same time, it was found that: (1) sodium tungstate is an anodic corrosion inhibitor which mainly inhibits the anodic reaction; (2) when the concentration of composite corrosion inhibitor is more than 300 mg/L, it can protect Q235 carbon steel well, and the lower the temperature of sea water is, the better the protection effect is.