Corrosion Of Carbon Steel Research Articles

Synergistic corrosion effects of magnetite and microorganisms: microbial community dependency

The synergistic corrosion effect of acid-producing bacteria (APB) and magnetite on carbon steel corrosion was assessed using two different microbial consortia. A synergistic corrosion effect was observed exclusively with Consortium 2, which was composed of Enterobacter sp., Pseudomonas sp., and Tepidibacillus sp. When Consortium 2 was accompanied by magnetite, uniform corrosion and pitting rates were one-time higher (0.094 mm/year and 0.777 mm/year, respectively) than the sum of the individual corrosion rates promoted by the consortium and deposit separately (0.084 and 0.648 mm/year, respectively). The synergistic corrosion effect observed exclusively with Consortium 2 is attributed to its microbial community structure. Consortium 2 exhibited higher microbial diversity that benefited the metabolic status of the community. Although both consortia induced acidification of the test solution and metal surface through glucose fermentation, heightened activity levels of Consortium 2, along with increased surface roughness caused by magnetite, contributed to the distinct synergistic corrosion effect observed with Consortium 2 and magnetite.Key points• APB and magnetite have a synergistic corrosion effect on carbon steel.• The microbial composition of APB consortia drives the synergistic corrosion effect.• Magnetite increases carbon steel surface roughness.

Adsorption and Inhibition Mechanisms of New Pyrazole Derivatives for Carbon Steel Corrosion in Hydrochloric Acid Solutions Based on Experimental, Computational, and Theoretical Calculations.

The study aims to synthesize two green pyrazole compounds, N-((1H-pyrazol-1-yl)methyl)-4-nitroaniline (L4) and ethyl 5-methyl-1-(((4-nitrophenyl)amino)methyl)-1H-pyrazole-3-carboxylate (L6), and test their action as corrosion inhibitors for carbon steel (CS) in a 1 M HCl solution. Both chemical and electrochemical methods, namely, gravimetric measurements (WL), potentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS), were used to assess the efficiency of the investigated molecules. DFT calculations at B3LYP/6-31++G (d, p) and molecular dynamics simulation were used to carry out quantum chemical calculations in order to link their electronic characteristics with the findings of experiments. The organic products exhibited good anticorrosion ability, with maximum inhibition efficiencies (IE %) of 91.8 and 90.8% for 10-3 M L6 and L4, respectively. In accordance with PDP outcomes, L6 and L4 inhibitors act as mixed-type inhibitors. Assessment of the temperature influence evinces that both L4 and L6 are chemisorbed on CS. The adsorption of L4 and L6 on CS appears to follow the Langmuir isotherm. Scanning electron microscopy and UV-visible disclose the constitution of a barrier layer, limiting the accessibility of corrosive species to the CS surface. Theoretical studies were performed to support the results derived from experimental techniques (WL, PDP, and EIS).

Effect of coexistence of sulfate reducing bacteria and nitrate reducing bacteria on the under-deposit corrosion of carbon steel

The effect of sulfate reducing bacteria (SRB) and nitrate reducing bacteria (NRB) on under-deposit corrosion (UDC) of carbon steel is studied by weight loss tests, electrochemical measurements and surface analysis. The results show that SRB-induced UDC is significantly inhibited by NRB. This inhibition is attributed to the accumulation of NRB in deposits suppressing the growth of SRB, as revealed by the analysis of total accumulation number of bacteria and the characterization of bacteria-formed micro-holes indicating localized accumulation of bacteria in deposits. The suppressed SRB growth in deposits is discussed based on the NRB-induced biologically competitive exclusion and metabolite inhibition mechanisms.

Inhibition Effect of Triphenylmethane Dyes for the Corrosion of Carbon Steel in CO2-Saturated NaCl Corrosion Medium.

Carbon dioxide corrosion presents a significant challenge in the oil and gas field. This study simulates the corrosive environment characteristics of oil and gas fields to investigate the corrosion inhibition properties of three triphenylmethane dyes. The inhibitive performance and mechanisms of these dyes were analyzed through weight loss and electrochemical testing, revealing that crystal violet (CV) exhibited a superior inhibition effectiveness over malachite green (MG) and Fuchsine basic (FB). At a concentration of 150 ppm in a CO2-saturated 5% NaCl solution at 25 °C, CV achieved an impressive maximum inhibition efficiency of 94.89%. With the increase in temperature, the corrosion rate slightly decreased, and the corrosion rate was 92.94% at 60 °C. The investigated CV acted as a mixed-type corrosion inhibitor and its protection obeyed the Langmuir adsorption isotherm. The corrosion morphology was characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and confocal laser scanning microscopy (CLMS). Quantum chemical calculations and molecular dynamics simulations were employed to validate the corrosion inhibition mechanisms, providing guidance for the further application of these dyes in corrosion control.

Study on the Effect of Polyamine Water Treatment Agent on Metal Corrosion Inhibition in Boiler Steam-Water System.

A polyamine water treatment agent was prepared with the film-forming amine (N-oleyl-1,3-propylenediamine) and the neutralizing amine (cyclohexanamine) under optimal conditions. The copper sulfate liquid drop experiment showed that a protective film was formed by the polyamine water treatment agent on carbon steel. The analyses of the polarization curve and electrochemical impedance spectroscopy of carbon steel indicated that the polyamine water treatment agent exhibited geometric effects, which could inhibit both anode and cathode reactions of carbon steel, and the corrosion inhibition effect of the polyamine water treatment agent showed an extreme-concentration phenomenon. A metal corrosion experiment in a simulated boiler steam-water system indicated that the polyamine water treatment agent mitigated the corrosion of carbon steel at different temperatures, and the corrosion inhibition rates of the polyamine water treatment agent in liquid and gas environments at 150 °C were 53.84% and 67.43%, respectively, better than that at 350 °C. SEM-EDS characterization indicated that the formation of the corrosion product, iron oxide, on the carbon steel was reduced with the addition of the polyamine water treatment agent in the simulated boiler steam-water system.

Unveiling the effect of magnetite on the synergistic action of deposits and microorganisms on carbon steel corrosion

The synergistic corrosion effect of microorganisms and deposits on carbon steel corrosion was assessed with magnetite and sand. In the presence of the microbial consortium with magnetite, uniform corrosion rates were 3.5 times higher (0.611 mm/year) than the sum of the corrosion rates promoted by the consortium and deposit separately (0.056 and 0.110 mm/year, respectively). Conversely, with sand, uniform corrosion rates were only 1.5 times higher (0.093 mm/year) than the sum of the corrosion rates promoted by the consortium and deposit separately (0.056 and 0.006 mm/year, respectively). The heightened synergistic effect is attributed to magnetite's semi-conductive nature.

Assessing the corrosion protection of 8-hydroxyquinoline-cerium (iii) complex for carbon steel in a NaCl solution

In the present study, a complex between 8-hydroxyquinoline and cerium (III) (Ce-HQ) was synthesized in the presence of triethylamine. Afterwards, the complex was characterized by Field Emission Scanning Electron Microscopy (FESEM), Fourier-transform infrared spectroscopy (FTIR) and Thermo-Gravimetric Analysis (TGA). The inhibition efficiency of the Ce-HQ complex for the corrosion of carbon steel, evaluated by both Electrochemical Impedance Spectroscopy (EIS) and Potentiodynamic Polarization (PP) plots, reached 90 % after 2 h of immersion in a 0.01 M NaCl solution. Then, EIS measurements were carried out to evaluate the effect of the Ce-HQ complex, as inhibitive pigment, after incorporation in a waterborne epoxy coating applied over carbon steel plate. The total resistance (Rtotal) of the coated sample containing the Ce-HQ complex was higher (3.6 x 107 Ω cm2), after 35 days of exposure in a 0.5 M NaCl solution than the values obtained for the coating without Ce-HQ. The results showed that the EP/Ce-HQ coating provided not only corrosion protection by the Ce (III) ions and 8HQ release at the metal/coating interface, but also improved the barrier properties. This work proposed a new type of inhibitive pigments which can be used to develop effective coatings for corrosion protection.

Sulphate reducing bacteria (SRB) biofilm development and its role in microbial corrosion of carbon steel

The development of biofilm by pure SRB culture on carbon steel, and its role on corrosion were investigated using microscopic, spectroscopic, electrochemical and surface characterization techniques. Tubercle biofilm and irregularly shaped pits were observed on steel surfaces in high-nutrient biotic solution. Owing to development of a protective FeS film in 72 h immersion, corrosion resistance improved. In nutrient-deficient medium, a greater bacterial density attached to the metal surface as the consequence of starved bacteria seeking energy sources from metal. However, electrochemical non-homogeneity developed at the locations of their attachment, that gradually grew over the entire surface.

Elucidating the mechanisms of novel thiazole-based corrosion inhibitors in carbon steel/HCl interface: An integrated approach combining experimental and computational studies

Corrosion inhibitors serve as a paramount strategy in the domain of metal protection. This study investigates the efficacy of two thiazole derivatives, namely methyl (E)-5-(4-chlorophenyl)-2-((2-(1-hydroxynaphthalen-2-yl)vinyl)amino)thiazole-4-carboxylate (ThN), and methyl (E)-5-(4-chlorophenyl)-2-((2-hydroxystyryl)amino)thiazole-4-carboxylate (ThP) in mitigating corrosion of carbon steel in a 1 mol/L hydrochloric acid medium. Electrochemical Impedance Spectroscopy (EIS), Potentiodynamic Polarization (PDP), Scanning Electron Microscopy coupled with Energy-Dispersive X-ray Spectroscopy (SEM-EDX), and X-ray Diffraction analysis (XRD) were used to experimentally assess the corrosion inhibition performance of compounds under study. Experimental results revealed a concentration-dependent increase in the corrosion inhibition efficiencies of the thiazole derivatives, with ThP achieving 90 % and ThN attaining 93 %. The adsorption of both compounds adhered to the Langmuir adsorption model, indicating a physicochemical inhibition mechanism. PDP analyses revealed a mixed-type inhibitory behavior. Furthermore, SEM-EDX assessments validated the ability of the thiazole derivatives to enhance corrosion resistance. XRD studies revealed a marked decrease in corrosion-associated peaks upon the introduction of thiazole derivatives. The potential of zero charge (PZC) for the carbon steel was ascertained via EIS, clarifying the adsorption mechanism. Employing Conductor like Screening Model for Realistic Solvents (COSMO-RS), the solvation properties of the compounds were evaluated, while Quantum Chemical Calculations (QCCs) and Molecular Dynamics (MD) simulations contributed insights into reactivity descriptors and adsorption configurations on the Fe(110) surface. This study highlighted the impact of the aryl group on the adsorption and corrosion inhibition characteristics of investigated compounds, offering valuable guidance for future design and development.

Corrosion Investigation of Carbon Steel in Different Amine-Based CO2 Removal System

The steel industry is a major source of CO2 emissions, which is affecting the corrosion behavior of carbon steel. The corrosion behavior of carbon steel (C1018) absorbed for CO2 removal is examined in different blends of amine solution by adding a heat-stable salt neutralizer and increasing amine concentration. Corrosion of carbon steel using different methyldiethanolamine (MDEA)/ (5% piperazine amine solution) which had 26% amine solution that contained heat stable amine salts treated with neutralizer at 80 °C and CO2 loading was investigated. The effect of the treated solutions on the corrosion behavior was observed using either the K2CO3 treatment solution to reach 30% amine or increasing the concentration to 33% amine solution using weight loss, potentiodynamic polarization, cyclic voltammetry, and impedance measurements. A visual examination of the corroded samples of the different amine solutions was performed. XRD for phase identification and SEM for microstructure examination were used to describe the corroded surfaces and analyze the corrosion products on the specimen surfaces under different conditions. After nine days in the 30% amine solution, these analyses showed the formation of the FeCO3 protective layer. The carbon steel in 30% amine solution provides better protection, and the lowest corrosion resistance (39.9 µm/Y).

Unraveling the structure-property relationship of pyrimidine-derivatives as CO2 corrosion inhibitors: Experimental and periodic DFT investigations

CO2-containing environments commonly cause corrosion of carbon steel (CS) pipelines used in the oil and gas industry. In this work, the inhibition of corrosion by three derivatives of pyrimidine, namely 2-mercaptopyrimidine (MPY), 4-hydroxy-2-mercapto-6-methylpyrimidine (HMMP), and 4,5-Diamino-2,6-dimercaptopyrimidine (DDMP) for C1018 CS in CO2 saturated 3.5% NaCl brine was investigated. The corrosion rates and inhibition efficiency were investigated at 25 and 70 °C using open circuit potential, linear polarization resistance, potentiodynamic polarization and electrochemical impedance measurements. The post-immersion surface characterization of the exposed C1018 CS with and without the three molecules was carried out using SEM and 3D surface optical profilometer. Theoretical computation using DFT was further utilized to examine the role of the molecular structures and the mechanism of inhibition of the three molecules on steel surface at the atomic level. The experimental results indicate the following order of inhibition efficiency: MPY > DDMP > HMMP. Our experimental work proved that MPY molecule (the smaller one with the least number of heteroatoms) as the most efficient corrosion inhibitor. Surface characterization analysis confirmed the order of inhibition efficiency. The theoretical results revealed that the stability of molecules adsorbed on Fe (110) surface in the parallel orientation and on FeCO3 (104) is identical on both surfaces, which is completely consistent with the experiment. Our study provides a feasible strategy for developing new corrosion inhibitors by understanding how similar organic inhibitors work.

Water-soluble N-methylpolypyrrole nanoparticles as a highly efficient eco-friendly corrosion inhibitor for carbon steel in 3.5 wt% NaCl solution

Metal corrosion is a significant problem in industrial units that can disrupt operations and increase costs. A corrosion inhibitor (CI) is an effective solution to this issue. Organic compounds are suitable and efficient CIs for carbon steel (CS) against corrosion. Among them, intrinsically conducting polymers (ICPs) are gaining traction in numerous industries due to their eco-friendliness, low cost, high stability, and simple production process. One of the major obstacles associated with employing ICPs as CI is their limited solubility in aqueous media. The present study aimed to synthesize water-soluble N-methylpolypyrrole (NmPPy) nanoparticles through a facile, rapid, and cost-effective approach. The successful synthesis of the NmPPy nanoparticles has been confirmed through characterization using scanning electron microscopic (SEM), Fourier transform infrared (FTIR) spectroscopy, and UV–vis spectra. The effectiveness of NmPPy nanoparticles in protecting CS against corrosion in a 3.5 wt% NaCl solution with varying concentrations at ambient temperature was evaluated using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) measurements. The findings from the study indicate that the NmPPy nanoparticles exhibit a noteworthy corrosion protection capacity for CS. At a concentration of 300 mg L−1, the NmPPy acted as a mixed-type inhibitor and yielded around 95% inhibition efficiency. Moreover, the adsorption behavior of the particles followed the Langmuir isotherm model with chemical adsorption. Surface morphology analysis techniques, including scanning Kelvin probe (SKP), field-emission scanning electron microscopy (FESEM), and energy-dispersive X-ray spectroscopy (EDX), have confirmed the development of a protective film on the CS. The analysis indicates that the CS has a smooth surface, and the NmPPy nanoparticles exhibit high inhibition efficiency. Therefore, the water-soluble NmPPy nanoparticles effectively inhibit CS corrosion in NaCl solution. They hold immense promise for the future development of advanced protective materials.

Effective Performance of Derived Sustainable Lupine Carbon Quantum Dots as a Superior Inhibitor Material for Carbon Steel Corrosion in a Hydrochloric Acidic Environment (1.0 Molar)

Effective Performance of Derived Sustainable Lupine Carbon Quantum Dots as a Superior Inhibitor Material for Carbon Steel Corrosion in a Hydrochloric Acidic Environment (1.0 Molar)

Influence of marine Shewanella putrefaciens and mediated calcium deposition on Q235 carbon steel corrosion

The microbiologically influenced corrosion inhibition (MICI) of Q235 carbon steel by Shewanella putrefaciens and mediated calcium deposition were investigated by regulating microbial mineralization. In a calcium-rich medium, S. putrefaciens rapidly created a protective calcium carbonate layer on the steel surface, which blocked Cl- diffusion. Without calcium, the biofilm and rust layer mitigated pitting corrosion but did not prevent Cl- penetration. Potentiodynamic polarization results indicated that the current densities (icorr values) of the corrosion produced in the S. putrefaciens-inoculated media with and without calcium were 0.4 μA/cm2 and 0.6 μA/cm2, respectively. Similarly, compared with those under sterile conditions, the corrosion inhibition rates were 92.2% and 87.4% higher, respectively. Electrochemical impedance spectroscopy (EIS) and scanning electrochemical microscopy (SECM) confirmed that the MICI was caused by the combination of microbial aerobic respiration and the deposited layers. Even under nonbiological conditions, S. putrefaciens-induced calcium carbonate deposition inhibited corrosion.

The impact of environmentally friendly supramolecular coordination polymers as carbon steel corrosion inhibitors in HCl solution: synthesis and characterization

Two 3D-supramolecular coordination polymers (SCP1 & SCP2) have been synthesized and characterized by physicochemical and spectroscopic methods. In a solution of 1.0 M HCl, SCPs were used to prevent corrosion of carbon steel (CS). The inhibition productivity (%η) rises as the synthetic inhibitor dose rises, and the opposite is true as the temperature rises. The study was carried out using chemical (mass loss, ML) and electrochemical ( potentiodynamic polarization, PDP and electrochemical impedance microscopy, EIS) techniques, which showed %η reached to 93.1% and 92.5% for SCP1 & SCP2, respectively at 21 × 10−6 M, 25 °C. For the polarization results, SCPs behave as mixed-type inhibitors. With increasing doses of SCPs, the charge transfer resistance grew and the double layer's capacitance lowered. The creation of a monolayer on the surface of CS was demonstrated by the finding that the adsorption of SCPs on its surface followed the Henry adsorption isotherm. The parameters of thermodynamics were computed and explained. The physical adsorption of SCPs on the surface of CS is shown by the lowering values of free energy (∆Goads < − 20 kJ mol−1) and increasing the activation energy (E*a) values in presence of SCP1 & SCP2 than in their absence. Atomic force microscope (AFM) and scanning electron microscopy (SEM) demonstrated the development of a protective thin film of SCPs precipitated on the surface of CS. There is a strong matching between results obtained from experimental and theoretical studies. Results from each approach that was used were consistent.

Preparation of self-healing superhydrophobic polyacrylate coatings based on silica matrix-microcapsules containing corrosion inhibitor for long-term corrosion protection

In this study, a superhydrophobic coating with self-healing properties for carbon steel corrosion protection was developed, incorporating fluorinated silica microcapsules containing corrosion inhibitor and fluorinated siloxane acrylate copolymer (FSC). Triethanolamine (TEA), functioning as a corrosion inhibitor, was encapsulated in silica matrix-microcapsules through a water-in-oil (W/O) interfacial condensation method. Furthermore, the prepared silica microcapsules underwent 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES) fluorination modification under the catalytic action of ammonia. Upon mechanical disruption of the superhydrophobic coating, the microcapsules liberate rust inhibitors, thereby instigating the formation of a fresh passivation layer on the surface of mild steel, perpetuating its defense against corrosion. These prepared superhydrophobic coatings manifest commendable antifouling, self-cleaning, and durability attributes, collectively representing pivotal traits requisite for efficacious metal surface anticorrosion. Electrochemical impedance spectroscopy (EIS) assessments conclusively substantiate the pronounced enhancement in the corrosion resistance of mild steel surfaces upon application of the synthesized superhydrophobic coating. More importantly, the self-healing capability of the superhydrophobic rust-resistant coating has been confirmed through EIS testing. Specifically, following mechanical damage to the superhydrophobic coating, the corrosion resistance of specimens housing rust inhibitors markedly exceeds that of counterparts devoid of these inhibitors. The innovative amalgamation of intelligent composite superhydrophobic coatings, underscored by these findings, underscores its broad applicability in combating metal corrosion, thereby holding substantial promise in this domain.

In silico evaluation for the design of coumarin-type compounds based on phenol and naphthol rings as a coating in carbon steel corrosion processes: DFT B3LYP calculations, synthesis and electrochemical characterization

Corrosion is a natural electrochemical process that converts metals into their most stable form, oxides. Coating metals with paints is done most effectively if oxide scales are removed, which is done by exposing the metals to corrosive media such as HCl, H2SO4, HNO3, and NaCl. However, corrosive solutions also attack the metal surface, and adding an inhibitor to the acid environment becomes necessary. Inhibitors can be inorganic or organic and are evaluated through techniques such as Potentiodynamic Polarization (PDP) and Impedance Spectroscopy (EIS). This work evaluated coumarin-type organic molecules compounds as potential corrosion inhibitors through the DFT B3LYP calculations of quantum descriptors. The results were analyzed using Principal Components Analysis (PCA), it is established that the values of inhibitory efficiency of 1, and 33, showed that the corrosion of the metallic surface which can be seen in the inhibitory efficiency values 1 (57,14 %) and 33 (82,86 %), it is evident that 33 has the highest effect respect other coumarins being identified as phenol and naphthol derivatives. These compounds were synthesized employing sequential reactions from the respective phenol: Pechmann cyclization, nitration, and reduction reactions. Then, the compounds were evaluated as anti-corrosive agents for carbon steel in the presence of 1.0 M HCl. The cathodic and anodic current densities in the HCl solution containing coumarin 1 exhibit lower values than the 33 and the Blank solutions. The obtained data reveals that as the amount of coumarins 1 (3.2 mg), and 33 (2.8 mg) increases, the corrosion current density (icorr) decreases to values of 3.08 and 4.90 mA.cm-2, respectively. These results were validated through the electrochemical evaluation of the molecules obtained by Potentiodynamic Polarization (PDP), Impedance Spectroscopy. (EIS) and Scanning Electron Microscopy (SEM).

Extraction of flavonoids from Butterfly blue pea (Clitoria ternatea) flower as carbon steel corrosion inhibitor in CO2 environment: Experimental and theoretical approaches

The present study emphasizes the extraction of flavonoids from the Butterfly blue pea (Clitoria ternatea), a flower containing very strong antioxidant properties. The extracts were prepared using solvents with different polarity namely chloroform (CTCH), ethanol (CTET), ethyl acetate (CTEA) and water (CTW). The phytochemical studies for all extracts were evaluated to screen the phenolic content, flavonoid content, reducing power assay and tannin content as potential source of antioxidant properties of the flower. The crude aqueous extract (CTW) had the maximum phenolic content (106.79 ± 4.40 mg/GAE g) and the highest flavonoid content (85.05 ± 5.01 mg QE/g). All of the extracts were then characterized using complementary analyses, including FTIR, TGA, DSC, 1H and 13C NMR. CT extracts showed a substantial amount of phenols and flavonoids in comparison with standard quercetin. The performances of mild steel to prevent corrosion in 3.5 % NaCl medium doped with CT extracts (50, 100, 250, 500, 750, 1000 ppm) were ascertained by carrying out electrochemical measurements. It is apparent that CTW is superior in terms of corrosion inhibition of mild steel in NaCl medium under CO2 environment with respect to CTET extract (%IECTW = 89.91 % > %IECTET = 85.53 %). Adsorption of both inhibitors on the surface of MS obeyed Langmuir isotherm. Therefore, it can be inferred from the findings that CT extracts were adsorbed via both physical and chemical adsorption, hence showing excellent corrosion resistance behaviour, thus indicating its potential to be an alternative source of natural antioxidants potent CO2 corrosion inhibitor.

1,2,4-triazole-5-thione derivative for inhibiting carbon steel corrosion in 1M HCl: Synthesis, electrochemical, SEM/EDX, DFT, and MD investigations

In the current research, the corrosion inhibition efficiency of a novel synthesized 1,2,4-triazole-5-thione derivative, named 1,8bis(5-mercapto-3-(4‑chloro)-phenyl-1,2,4-triazolyl)-triethyleneglycol (3) for carbon steel in 1 M HCl medium is assessed employing conventional weight-loss measurements as well as electrochemical methods, including electrochemical impedance spectroscopy and potentiodynamic polarization. The findings highlighted that the presence of the tested inhibitor led to a decrease in the corrosion rate and enhancement of the inhibitory efficacy with a maximum value of around 93 % obtained at a concentration of 10–3 M. This might be associated with the creation of a protective adsorption film on the metal surface. Electrochemical measurements disclosed the mixed-type inhibition effect of 3. The inhibitor adsorption mechanism followed the Langmuir adsorption isotherm. Despite that, a thorough examination of the carbon steel surfaces, both in their uninhibited and inhibited states, was conducted through scanning electron microscopy (SEM) coupled with energy-dispersive X-ray (EDX) analysis. The experimental findings were supported by computational chemistry calculations using density function theory (DFT) and Molecular Dynamic (MD) simulations.

Eco-friendly bifunctional antibacterial and anticorrosive broad-spectrum rosin thiourea iminazole quaternary ammonium salt against microbiologically influenced corrosion

Bifunctional antibacterial and anticorrosive broad-spectrum rosin thiourea iminazole quaternary ammonium salt (RTIQAS) was investigated to inhibit microbiologically influenced corrosion (MIC) caused by anaerobic gram-negative sulfate reducing bacterium (SRB) Desulfovibrio vulgaris against X80 carbon steel and aerobic gram-positive bacterium Bacillus licheniformis against 316L stainless steel. It also indicated that RTIQAS was more effective than common commercial biocides THPS (tetrakis hydroxymethyl phosphonium sulfate) and glutaraldehyde at the same concentration against X80 carbon steel corrosion by D. vulgaris. In the molecular simulation, the interaction energy confirmed the favorable adsorption of RTIQAS on the metal surfaces, indicating its potential as an effective corrosion inhibitor.