Anticorrosion Activity Research Articles

Synthesis, catalytic activity, magnetic study and anticorrosive activity of mild steel in HCl 1 M medium of (H3dien)[Cu(NO3)(C2O4)2].2H2O. A redetermination at 100 K

Diethylenetriammonium nitrato-bis(oxalato)cuprate (II) dihydrate (H3dien)[Cu(NO3)(C2O4)2].2H2O (1) was synthesized by wet chemistry method. It was assessed for thermal stability (TG-DTA), single crystal X-ray diffraction, Fourier Transform Infrared spectroscopy (FTIR) and magnetic measurements. 1 crystallizes in the monoclinic system (P21/c), with the parameters: a = 10.1054(5) Å, b = 11.0825(5) Å, c = 14.8238(7) Å, β = 103.516(5)°, V = 1614.2 (1) Å3 and Z = 4. The complex anions are distributed into layers, whilst the self-assembly of the inorganic-organic entities is assured by an intricate hydrogen network. At 413 K, the thermal behavior predominantly consists of the removal of water molecules, while its infrared spectrum displays distinct bands of oxalate, nitrate and diethylenetriamine groups. The catalytic test indicated that complex 1 exhibits a good catalytic activity in nitrophenol isomers (NP) reduction to aminophenols (AP). Moreover, 1 showed a high photocatalytic degradation efficiency 90% at 90 min toward the methylene blue (MB) dye under the UV irradiation. Due to the presence of the heteroatoms in its structure, the examined hybrid material's corrosion-inhibiting action in acidic conditions was more pronounced.

Synthesis and Characterization of Hydrophobic and Low Surface Tension Polyurethane

Polyurethane is a common polymeric coating, providing abrasion resistance, chemical durability, and flexibility to surfaces in the biomedical, marine, and food processing industries with great promise for future materials due to its tunable chemistry. There exists a large body of research focused on modifying polyurethane with additional functionalities, such as antimicrobial, non-fouling, anticorrosive action, or high heat resistance. However, there remains a need for the characterization and surface analysis of fluoro-modified polyurethanes synthesized with commercially available fluorinated polyol. In this work, we have synthesized traditional solvent-borne polyurethane, conventionally found in food processing facilities, boat hulls, and floor coatings, with polyurethane containing 1%, 2%, and 3% perfluoropolyether (PFPE). Polyurethane formation was confirmed by attenuated total reflectance Fourier-transform infrared (ATR-FTIR) spectroscopy, with the urethane band forming at 1730 cm−1 and the absence of free isocyanate stretching from 2275–2250 cm−1. X-ray photoelectron spectroscopy (XPS) was used to confirm perfluoropolyether polymerization with an increase in the atomic percentage of fluorine. Wettability and hydrophobicity were determined using a dynamic water contact angle with significant differences in advancing the water contact angle with the inclusion of perfluoropolyether blocks (PU–co–1PFPE 131.5° ± 8.0, PU–co–2PFPE 130.9° ± 5.8, and PU–co–3PFPE 128.8° ± 5.2) compared to the control polyurethane (93.6° ± 3.6). The surface orientation of fluorine supported the reduced critical surface tensions of polyurethane modified with PFPE (12.54 mN m−1 for PU–co–3PFPE compared to 17.19 mN m−1 for unmodified polyurethane). This work has demonstrated the tunable chemical qualities of polyurethane by presenting its ability to incorporate fluoropolymer surface characteristics, including low critical surface tension and high hydrophobicity.

Experimental and numerical analysis of chloride ion transportation in concrete under bending load with reverse seepage

The paper investigates a new technique, named as Reverse-seepage and Saturation based Active Anti-corrosion Technology (RS-AAT), for preventing chloride ion invasion within the marine concrete under the loading effect. By the indoor model experiments, the effect of RS-AAT on chloride ion invasion within the marine concrete under 10%, 20%, and 30% ultimate bending loads are explored and the results indicate that RS-AAT can effectively reduce 24.36% and 27.29% in chloride ion concentration in the compression and tension regions, respectively. Otherwise, the use of RS-AAT can effectively decrease the surface chloride ion concentration. Furthermore, the chloride ions convection-diffusion model with loading effect is established based on the mesoscopic structure theory of concrete pores and the K-C model, of which variability is verified by comparing with the experimental results.

Developing single-atom catalyst-based epoxy coating with active nanocatalytic anticorrosion performance in oxygen environment

The stimuli-responsive anticorrosion coatings have drawn great attention as a prospective corrosion protection approach due to their smart self-repairing properties. In contrast to passive protection mechanism based on post-corrosion microenvironmental changes, a unique active protection strategy based on nanocatalytic oxygen depletion is proposed in this work to inhibit the occurrence of corrosion. Porous Fe–N–C catalysts with outstanding oxygen reduction reaction (ORR) activity (half-wave potential of 0.89 V) is firstly synthesized through pre-coordination with organosilane precursor to obtain homogeneously distributed active sites. When this catalyst is introduced into the coating matrix, uniformly distributed Fe–N–C not only compensates the defects but plays a crucial role in adsorption and consumption of diffused oxygen in the coating. Under this dual action, the penetration of corrosive medium, especially oxygen, through coating to metal substrate is greatly suppressed, resulting in effective corrosion inhibition and a significant increase in corrosion resistance of the composite coating compared to pure epoxy coating. This work provides a new perspective and the starting point for the design of high-performance smart coating with active anticorrosion properties.

Chitosan and Polyvinyl Propenenitrile: Synergistic Anti-Corrosive Activity on Mild Steel in Acidic Medium using Weight Loss Method

Chitosan and Polyvinyl Propenenitrile: Synergistic Anti-Corrosive Activity on Mild Steel in Acidic Medium using Weight Loss Method

Chitosan and Polyvinyl Propenenitrile: Synergistic Anti-Corrosive Activity on Mild Steel in Acidic Medium using Weight Loss Method

Chitosan and Polyvinyl Propenenitrile: Synergistic Anti-Corrosive Activity on Mild Steel in Acidic Medium using Weight Loss Method

Electrochemistry evaluation and quantum corroboration with surface analysis of potential anticorrosive of two new pyridazine derivatives for mild steel in 1 M HCl solution

Two new structurally related pyridazine derivatives, Ortho (PO) and Para (PP), were synthesized by greener chemical pathway, and were spectroscopically specified by 1H NMR and 13C NMR. Their application in corrosion inhibition of mild steel (MS) in 1.0 M HCl was explored by experimental electrochemical tests of Potentiodynamic Polarization (PDP), Electrochemical Impedance Spectroscopy (EIS), with a surface and corrosive solution analyses by means of Scanning Electron Microscopy (SEM), Energy Dispersive X˗ray (EDX) analysis, and UV˗vis spectroscopy, as well as by Density functional theory (DFT) calculations for corroboration and development of an interpretation of the experimentally obtained anticorrosive activity by referring to the particular effects of molecular structure. Electrochemical experiments tests provided that the two compounds act by physisorption and chemisorption adsorption modes, with a maximum efficiency of 94.4% and 95.4% for PO and PP, respectively at 10˗3 mol L˗1, and obey of Langmuir’s theory of monolayer adsorption. SEM/EDX and UV˗vis analysis confirmed this state of adsorption by an inhibitor film. DFT quantum chemical descriptors and molecular dynamics simulations showed a reasonable correlation with experimentally corrosion inhibition performance.

Chamber Protection of Zinc with Ethylhexanoic Acid.

Chamber protection is a promising and quickly developing method of vapor-phase protection of metals against atmospheric corrosion by inhibitors. It was shown that chamber treatment with 2-ethylhexanoic acid (EHA) efficiently inhibits the initiation of zinc corrosion. The optimum conditions (temperature and duration) of zinc treatment with vapors of this compound were determined. If these conditions are met, adsorption films of EHA with thicknesses up to 100 nm are formed on the metal surface. It was found that their protective properties increase during the first day as zinc is exposed to air after chamber treatment. The anticorrosive action of adsorption films is due both to the surface being shielded from the corrosive environment and to the inhibition of corrosion processes on the active surface of the metal. Corrosion inhibition was caused by the ability of EHA to convert zinc to the passive state and inhibit its local anionic depassivation.

A comparison of the inhibitory activity of 3-alkyland 3-hydroxyalkyl-5-amino-1H-1,2,4-triazoles against copper corrosion in chloride-containing environments

Copper is widely used as a material for technical solutions in microelectronics, as well as for the manufacture of various heat exchange equipment used in aggressive environments. Corrosion inhibitors are used for the reduction of the corrosive activity of the environment. This article presents the results of a study of the anticorrosion activity of a number of derivatives of the class 3-alkyl- and 3-hydroxyalkyl-5-amino-1H-1,2,4-triazole with respect to copper corrosion in chloride-containing environment. Over the course of the study, 3-alkyl- and 3-hydroxyalkyl-5-amino-1H-1,2,4-triazoles with different lengths of the alkyl substituent were synthesized. The structure of these compounds was confirmed using NMR spectroscopy and HPLC/MS analysis. Based on the results of electrochemical and direct corrosion tests, regularities were established for the inhibitory activity of the obtained compounds in acidic (1% HCl solution) and neutral (borate buffer solution, pH = 7.4) chloride-containing media. In in a neutral media, the greatest protective effect was obtained for 3-propyl-5-amino-1H-1,2,4-triazole I, which has the shortest alkyl radical without modification by an OH group. As the concentration increased in the range from 0.01 to 10.0 mmol/L, the inhibitory activity increased. With an increase in the length of the alkyl radical and/or the introduction of an OH group, a decrease or absence of a protective effect was observed. At the same time, in an acidic medium, the introduction of a hydroxyl group into the alkyl substituent of 5-amino-1H-1,2,4-triazole increased anti-corrosion efficiency only with sufficient length of the carbon chain. The highest protection degree was obtained for 17-(5-amino-1H-1,2,4-triazol-3-yl)heptadecan-7-ol IV at a concentration of 10.0 mmol/l and it reached a value of 97%.

Experimental, theoretical and MC simulation investigations of the inhibitory efficiency of novel non-toxic pyridazine derivatives inhibition on carbon steel in 1 M HCl solution

The anticorrosive activity of two novel synthesized nontoxic, effective and affordable pyridazine-based compounds, namely PZ-H and PZ-O-CH3, for MS in 1 M HCl acidic medium, was implemented using DFT quantum chemistry and Monte Carlo simulation. The results achieved were subsequently confirmed by electrochemical methods and UV–visible spectroscopic analysis, SEM/EDX surface analysis was also used as support tool. The impedance results revealed that the charge transfer resistance increased progressively with concentration, and the polarization plots showed that the molecules exhibited mixed-type behavior with a fit to the Langmuir adsorption model. The alteration of the surface morphology of both structures compared to the blank solution confirmed the protective ability of the studied compounds. The maximum inhibition was found to be 92 % for the compound PZ-H and 95 % for the compound PZ-O-CH3 at a concentration of 1 × 10−3 M at 298 K temperature. Both compounds show the particularity to keep a good stability of the inhibitory efficiency even with increasing temperature and immersion time. The theoretical findings are in good accordance with the experimental data.

Dopamine modified natural glucomannan as a highly efficient inhibitor for mild steel: Experimental and theoretical methods

In this work, Glucomannan was modified with dopamine to synthesize a new polysaccharide Schiff base (GAD). After confirmation of GAD by NMR and FT-IR spectroscopic methods, it was introduced as a sustainable corrosion inhibitor with excellent anti-corrosion action for mild steel in 0.5 M hydrochloric acid (HCl) solution. Employing electrochemical test, morphology measurement, and theoretical analysis, the anticorrosion performance of GAD on mild steel in 0.5 M HCl solution is determined. Maximum efficiency of GAD for suppressing the corrosion rate of mild steel at 0.12 g L−1 reaches 99.0 %. After immersion in HCl solution for 24 h, the results from scanning electron microscopy indicate that GAD is firmly attached to the mild steel surface by making a protective layer. According to the X-ray photoelectron spectroscopy (XPS), FeN bonds existed on the steel surface indicate the presence of chemisorption between GAD and Fe to form stable complexes attracted to the active position on the mild steel. The effects of Schiff base groups on the corrosion inhibition efficiencies were also investigated. Moreover, the inhibition mechanism of GAD was further illustrated by the free Gibbs energy, quantum chemical calculation and molecular dynamics simulation.

Synthesis of natural glucomannan derivative as a highly-efficient green inhibitor for mild steel in the simulated seawater

Herein, we report a rational design and synthesis of a highly-efficient and eco-friendly glucomannan derivative (GA-2) by the introduction of the thiazole and Schiff base groups into glucomannan (GA). After confirmation of GA-2 by the spectroscopic methods, it was introduced as corrosion inhibitor with excellent anti-corrosion action for mild steel (MS) in the simulated seawater. As-obtained results reveal that GA-2 has a significantly enhanced anticorrosion performance, and its inhibitive efficiency reaches 98.8% at the 0.5 mmol L−1 inhibitor concentration, much higher than that of GA (69.8%) and the intermediate derivative GA-1 (81.2%). The significantly enhanced protection performance could be attributed to the rich S heteroatoms, aromatic rings, and Schiff base groups in the GA-2, which strongly promotes the chemisorption as well as physisorption between GAD and MS. X-ray photoelectron spectroscopy (XPS) results, show that the appearance of N-Fe and S-Fe bonds confirms the strongly anchoring interaction between GA and MS. Furthermore, according to the quantum chemical calculations, the results from the lowe energy gap and radical distribution function (RDF) analyses further confirm the strong chemisorption of GA-2 at the surface of steel, which illustrates the excellent inhibition performance at the molecule and atom level.

Low-frequency blue energy harvesting for sustainable and active anticorrosion

Low-frequency blue energy harvesting for sustainable and active anticorrosion

Synthesis of Bio-Based Polybenzoxazine and Its Antibiofilm and Anticorrosive Activities.

Candida albicans are highly widespread pathogenic fungi in humans. Moreover, its developed biofilm causes serious clinical problems, leading to drug failure caused by its inherent drug tolerance. Hence, the inhibition of biofilm formation and virulence characteristics provide other means of addressing infections. Polymer composites (PCs) derived from natural products have attracted increasing interest in the scientific community, including antimicrobial applications. PCs are a good alternative approach to solving this challenge because of their excellent penetration power inside biofilms. The main objectives of this study were to synthesize a novel curcumin-based polybenzoxazine polymer composite (poly(Cu-A) PC) using Mannich condensation reaction and evaluate their potency as an antibiofilm and anticorrosive candidate against C. albicans. In addition, their anticorrosive efficacy was also explored. PC exhibited significant antibiofilm efficacy versus C. albicans DAY185 by the morphologic changing of yeast to hyphae, and>90% anticorrosive efficacy was observed at a higher dose of PC. These prepared PC were safe in vivo against Caenorhabditis elegans and Raphanus raphanistrum. The study shows that a polybenzoxazine polymer composite has the potential for controlling biofilm-associated fungal infections and virulence by C. albicans, and opens a new avenue for designing PCs as antifungal, anticorrosive agents for biofilm-associated fungal infections and industrial remediation.

Interface engineering of LDH-based material as efficient anti-corrosive system via synergetic performance of host, interlayers, and morphological features of nature-mimic architectures

High-performance hybrid materials with special features are desired to meet the requirements of more complex cutting-edge applications. However, the self-assembly of layered double hydroxides (LDH) with organic frameworks is hampered by a lack of understanding of the formation mechanism and the effects of the self-assembled architecture on anticorrosion activity remain a major challenge. Herein, we put forward how the honeycomb-like network would architecturally upgraded on the pre-existing hierarchical floral structure with Trimesic acid (TMA) compound resulting in a promising layer-by-layer (LBL) material. This nature-inspired network is realized to offer an ideal approach not only endows with excellent properties but also exploits the power of layered coating materials as a bastion in the fields of nanotechnology, without limiting conditions, taking advantage of the synergy beneficial effects of the self-assembled honeycomb-like TMA and the anion-exchange ability of the layered coating material. In this work, a three-dimensional assembly with an architecture closely resembling interconnected micro-petals was successfully deposited on the defective surface obtained via plasma electrolytic oxidation (PEO) of Mg alloy, where TMA compound was used for supramolecular self-assembly. The MgO layer was first formed on AZ31Mg alloy via PEO treatment and the Mg-Al LDH micro-petals were synthesized on the MgO surface in the presence of a chelating agent [diethylenetriaminepentaacetic acid (DTPA)]. In a typical synthesis, TMA compound was used as an appropriate linker for the formation of well-organized multidimensional layered materials taking advantage of the synergy beneficial effects of the self-assembled honeycomb-like TMA and the anion-exchange ability of the Mg-Al LDH coating. The results indicate that Mg alloy coated with the self-assembled TMA@LDH-MgO materials presents excellent anti-corrosion performance as compared to the bare Mg. The use of such system would open a brand-new possibility to correct, in a targeted way, the inevitable defects of the layered coating morphology while retaining its exceptional potential. First-principles calculations, quantitative molecular surface analyses and independent gradient model framework further verify the self-assembly and adsorption behavior of TMA over the Mg-Al LDH layer. The improved performance of the TMA@Mg-Al LDH film is attributed to the synergistic effects of different interactions that occurred around active sites in the hierarchical network.

Determination of the Anti-corrosive Activity of Chitosan on Mild Steel Using Gravimetric and Electrochemical Methods

Determination of the Anti-corrosive Activity of Chitosan on Mild Steel Using Gravimetric and Electrochemical Methods

Synthesis, characterization and fungicidal activity of novel 2-aminopyrimidine Schiff bases

2-Aminopyrimidines represents vital class of bioactive molecules where its structural changes would lead to its peculiar properties. N -heterocyclic compound i.e. 2-aminopyrimidine had wide range of applications in pharmacological, material chemistry and agriculture as antifungal, antimicrobial and antibacterial agents. 2-Aminopyrimidine and its derivatives are good candidates for antimicrobial, antifungal and anticorrosion activity. In the present study, a series of substituted N -benzylidine-2-aminopyrimidine compounds have been synthesized by condensation reaction of 2-aminopyrimidine with substituted benzaldehydes ( o -chloro , m -hydroxybenzaldehyde, p -hydroxybenzaldehyde, 2,5-dimethoxybenzaldehyde, p -dimethylaminobenzaldehye, syringaldehyde, o -phthaldehyde, isovanillin benzaldehyde, veratraldehyde and thiophene-2-carboxyaldehyde) using glacial acetic acid or NaOH (40%). The synthesised Schiff bases have been characterized using UV, IR, 1 H NMR and 13 C spectral studies. 2-Aminopyrimidine Schiff bases ( 1-10 ) have been examined for fungitoxicity on the growth of Fusarium verticillioides , Rhizoctonia solani and Macrophomina phaseolina using poisoned food technique.

Anticorrosion action of the olive leaf compounds extracted under optimal parameters as determined with experimental design

In this study, an agricultural waste product was used to prepare a green corrosion inhibitor based on olive leaves (Olea europaea var. syslvestris). Firstly, an optimization study of antioxidant activity of O. europaea leaves monitored by the DPPH free radical trapping method, was carried out using full factorial design. In the second step, the extract obtained under optimal conditions was tested as a green corrosion inhibitor for steel in 0.5 mol dm-3 HCl, using gravimetric and electrochemical methods. The results obtained by various techniques showed that the extract acted as a mixed-type inhibitor. The adsorption of the inhibitor was spontaneous (?Gads = ?12.443 kJ mol-1), through the mechanism of physical adsorption, and it obeyed the Langmuir adsorption isotherm. The highest corrosion inhibition efficiency of 92 % was obtained for 2.8 10-3 g cm-3of inhibitor, as measured by gravimetric method.

Побочные продукты окислительной десульфиризации судового маловязкого топлива — перспективные ингибиторы коррозии

The studies described in the article show that the by-product of oxidative desulfurization of low-viscosity marine fuel is a promising inhibitor of acid corrosion, showing anticorrosive activity in dimethylformamide medium with respectto carbon steel grade St3sp with a degree of protection of 75.5%. This will not only simplify the material support of the proposed alternative technological process of desulfurization of fuel and solve environmental problems, but also reduce the need of the domestic industry for expensive imported reagents.

Synthesis, Electrochemical, Morphological, Computational and Corrosion Inhibition Studies of 3-(5-Naphthalen-2-yl-[1,3,4]oxadiazol-2-yl)-pyridine against Mild Steel in 1 M HCl

1,3,4-Oxadiazole derivative, namely, 3-(5-naphthalen-2-yl-[1,3,4]oxadiazol-2-yl)pyridine (NOP) as a corrosion inhibitor against mild steel in 1M HCl has been evaluated using the weight-loss technique (303-323 K), electrochemical analysis [potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS)], as well as surface morphology investigations (SEM). Additionally the computational studies such as density functional theory (DFT), the synthesized molecule (NOP) were utilized to better insight into molecular structure and electronic aspects relating to the anti-corrosion activities of the examined inhibitors and to envisage the interaction between designed inhibitors with the mild steel surface. The synthesized molecule (NOP) expressed high inhibition efficiency of 88.62% at an optimal concentration of 500 ppm at 298 K. A mixed-type inhibition mechanism is suggested by potentiodynamic polarization (PDP) analysis. The DFT calculations complement well with the experimental outcomes. This article provides in-depth insights to comprehend the mild steel inhibitor interactions mode and can be very helpful in accentuating the approach to mitigate the metal dissolution occurring in acidic corrosive media.