Anti-corrosion Materials Research Articles

Study of volatile corrosion inhibitors by infrared spectroscopy

In practice, it often becomes necessary in practice to identify a particular substance or chemical product as a whole, and also to quantify their content in the developed material. Corrosion inhibitors are special chemicals that retard the process of chemical and physical reactions. Determination of the minimum permissible concentration of the inhibitor in anticorrosive papers has an important practical significance because it specifies the duration of their protective effect. The possibility of practical application of infrared (IR) spectroscopy is considered in the study of structural features of volatile corrosion inhibitors and packaging materials with these inhibitors. Koring 501, Koring 505 inhibitors of Cortec Corporation (USA) and UNI inhibitor (a mixture of sodium nitrite and urotropine in a ratio of 1:1, Russia) were used as volatile corrosion inhibitors for anticorrosive packaging materials preparation. Aqueous solutions of inhibitors containing 5 % (wt.) of the active substance were applied on the surface of creped paper with thermoplastic polymer lamination on one side by roller method. IR spectra of pure inhibitors and inhibited samples of packaging material were plotted on an IR Fourier spectrometer FT 801. The IR spectra of each inhibitor exhibit peaks that are unique to it. This will allow the inhibitors to be distinguished from each other. It was found by means of IR analysis that the composition of foreign inhibitors includes compounds containing nitrite ions (NO2‒). It is shown that the IR spectroscopy can be used to control the quality of the anticorrosive packaging materials. This is particularly topical in the conditions of import substitution.

Supplying long-term workability of the old elements of the hydraulic facilities by using of cold compositions

The aim of the research is to improve the composition of the cold composition BNR (bitumen-nairite rubber) by improving the technical properties, the technology of anti-filtration and anti-corrosion materials using at repair of the hydraulic structures, as well as the development of a method for predicting the state of reliability of hydraulic structures with anti-corrosion and sealing protective coating.

Interfacial adsorption study of Nitrogen based inhibitors in silane nanocontainers as anticorrosive and self-healing material for steel in strong acid solution.

Nitrogen based organic compound is very useful in coordination chemistry due to their interesting networking ability. This paper describes the preparation and characterization of different nitrogen based corrosion inhibitors loaded...

Machine-building anti-corrosion composite polymeric materials and coatings based on local raw materials and production waste

The article discusses the results of a study on the development of effective compositions of anticorrosive composite polymer materials and coatings filled with organic-mineral ingredients based on epoxy resins ED-16 and ED-20. The compositions of the developed anticorrosive polymer compositions and the main physical-chemical and mechanical properties of the developed anticorrosive compositions based on oligomers and other organic-mineral ingredients are given.

New insights into phase transition behavior and electrochemistry corrosion of three-dimensional biphenylene.

It is estimated that the annual cost of corrosion in most countries accounts for 3-4% of gross domestic product, far exceeding the losses caused by natural disasters, prompting scientists to continuously search for high-performance anti-corrosion materials. Among these high-performance materials, two-dimensional carbon materials represented by graphene have received widespread attention due to their excellent chemical stability and anti-permeability. However, some studies have found that the poor ability of graphene to bind to the interface and the electrical coupling caused by metallicity make it possible to protect copper from corrosion only for a short period of time. To circumvent these issues, through phase behavior research, interface binding property simulation and corrosion mechanism exploration, we propose a more promising anti-corrosive three-dimensional (3D) biphenylene diamond-like carbon membrane (BP-DLC). The kinetic study results show that due to the Gibbs free energy of biphenylene structures below three layers being lower than 0, few-layer biphenylene can spontaneously generate phase transitions of limited size, forming a biphenylene diamond-like membrane and exhibiting superior mechanical properties and a certain degree of flexibility. Mechanical and electronic performance results further show that there is a strong bonding effect between BP-DLC and the metal surface, which further enhances the bistate heterostructure and prolongs the coating life of BP-DLC materials. Compared with pure graphene and Cu substrates, BP-DLC membranes exhibit stronger corrosion resistance by reducing porosity, increasing charge transfer and hindering the diffusion of corrosion ions to the substrate. This study provides a new strategy for constructing corrosion-resistant materials by designing long-term stable and highly corrosion-resistant diamond-like membranes.

Research of hydroabrasive wear resistance of organomineral coatings depending on operating environment conditions

The critical importance of corrosion protection puts it forward as a leading economic and applied problem for all countries. Costs associated with corrosion, even in developed countries, range from 1 to 3.5 per cent of gross domestic product (GDP). This article discusses issues related to the development of the composition of anti-corrosion materials from organo-mineral heterocomposites for use in structures for the storage and transportation of various aggressive liquids. Experiments were carried out in real operating conditions of equipment for storage and transportation of oil and oil products. Based on the study of the composition of associated water, taking into account the influence of mechanical impurities, the phenomena occurring on the surface of the metal were studied and the optimal composition was selected, the use of which will increase the service life.

Self-Healing, Solvent-Free, Anti-Corrosion Coating Based on Skin-like Polyurethane/Carbon Nanotubes Composites with Real-Time Damage Monitoring

Self-healing anti-corrosion materials are widely regarded as a promising long-term corrosion protection strategy, and this is even more significant if the damage can be monitored in real-time and consequently repaired. Inspired by the hierarchical structure of human skin, self-healing, solvent-free polyurethane/carbon nanotubes composites (SFPUHE-HTF-CNTs) with a skin-like bilayer structure were constructed. The SFPUHE-HTF-CNTs were composed of two layers, namely, a hydrophobic solvent-free polyurethane (SFPUHE-HTF) containing disulfide bonds and fluorinated polysiloxane chain segments consisting of a self-healing layer and CNTs with good electrical conductivity consisting of a corrosion protection layer, which also allowed for the real-time monitoring of damage. The results of corrosion protection experiments indicated that the SFPUHE-HTF-CNTs had a low corrosion current density (8.94 × 10-9 A·cm-2), a positive corrosion potential (-0.38 V), and a high impedance modulus (|Z| = 4.79 × 105 Ω·cm2). The impedance modulus could still reach 4.54 × 104 Ω·cm2 after self-healing, showing excellent self-healing properties for anti-corrosion protection. Synchronously, the SFPUHE-HTF-CNTs exhibited a satisfactory damage sensing performance, enabling the real-time monitoring of fractures at different sizes. This work realized the effective combination of self-healing with corrosion protection and damage detection functions through a bionic design, and revealed the green, and low-cost preparation of advanced composites, which have the advantage of scale production.

Metals and metal oxides polymer frameworks as advanced anticorrosive materials: design, performance, and future direction

Abstract Metals (Ms) and metal oxides (MOs) possess a strong tendency to coordinate and combine with organic polymers to form respective metal–polymer frameworks (MPFs) and metal oxide polymer frameworks (MOPFs). MPFs and MOPFs can be regarded as composites of organic polymers. MPFs and MOPFs are widely used for industrial and biological applications including as anticorrosive materials in the aqueous phase as well as in the coating conditions. The presence of the Ms and MOs in the polymer coatings improves the corrosion inhibition potential of MPFs and MOPFs by improving their self-healing properties. The Ms and MOs fill the micropores and cracks through which corrosive species such as water, oxygen, and corrosive ions and salts can diffuse and destroy the coating structures. Therefore, the Ms and MOs enhance the durability as well as the effectiveness of the polymer coatings. The present review article is intended to describe the corrosion inhibition potential of some MPFs and MOPFs of some most frequently utilized transition metal elements such as Ti, Si, Zn, Ce, Ag, and Au. The mechanism of corrosion inhibition of MPFs and MOPFs is also described in the presence and absence of metal and metal oxides.

Application of anticorrosive materials in cement slurry: Progress and prospect

During gas well cementing operation, the erosion of acidic formation corrosive medium will destroy the cementation between the cement slurry and the sidewall in the well sealing section, reduce the mechanical properties of the cement paste, cause problems such as sidewall collapse and casing damage, seriously endanger the normal exploitation of oil and gas resources, and cause major safety accidents. Therefore, improving the corrosion resistance of cement paste is the key to ensuring long-term stable cementing of high-temperature sour gas wells. This paper summarizes the influencing factors, corrosion mechanism, corrosion test methods and research status of anti-corrosion oil well cement additives, discusses the advantages and disadvantages of each anti-corrosion additive, summarizes the latest progress and challenges of anti-corrosion oil well cement, and aims to provide some reference for researchers in related fields.

A kind of biological hybrid material – Trichoderma viride/FeOOH as a durable anticorrosion coating for steel

Development of anticorrosive materials is critical and the most efficient way in the innovation of solving corrosion problems. Biological hybrid materials have unique advantages and great potential in the corrosion resistance materials. Herein, a new biological hybrid material was designed by the interaction of Trichoderma viride(T. viride) and Fe-based nanomaterials for anticorrosion of steel in artificial seawater. The results showed that the biological hybrid material - T. viride/FeOOH with a cobweb was successfully synthesized by self-assembly of T. viride and Fe-based nanomaterials on the steel surface. T. viride/FeOOH with thickness only 60 μm exhibited good anti-corrosion effect and its anti-corrosion efficiency reached up to 88.97 %. Further, T. viride/FeOOH was fairly stable, and its corrosion resistance was still up to 87.45 % after 20 d of continuous immersion in seawater. This study provides a new perspective and option for anti-corrosion control of steel in marine environment.

High-Performance Corrosion-Resistant Polymer/Graphene Nanomaterials for Biomedical Relevance

Initially, pristine polymers were used to develop corrosion-resistant coatings. Later, the trend shifted to the use of polymeric nanocomposites in anti-corrosion materials. In this regard, graphene has been identified as an important corrosion-resistant nanomaterial. Consequently, polymer/graphene nanocomposites have been applied for erosion protection applications. Among polymers, conducting polymers (polyaniline, polypyrrole, polythiophene, etc.) and nonconducting polymers (epoxy, poly(methyl methacrylate), etc.) have been used as matrices for anticorrosion graphene nanocomposites. The corrosion-resistant polymer/graphene nanocomposites have found several important applications in biomedical fields such as biocompatible materials, biodegradable materials, bioimplants, tissue engineering, and drug delivery. The biomedical performance of the nanomaterials depends on the graphene dispersion and interaction with the polymers and living systems. Future research on the anti-corrosion polymer/graphene nanocomposite is desirable to perceive further advanced applications in the biomedical arenas.

Challenges and opportunities in using ionic liquids-modified carbon allotropes as emerging anticorrosive nanomaterials

• Ionic Liquids-Modified Carbon Allotropes (ILMCAs) were surveyed as noble anticorrosive materials. • ILMCAs act as nanofillers and are gaining growing attention as they strongly enhance corrosion resistance. • ILMCAs act as much more effective nanofillers than polymer composite nanofillers. • ILMCAs can be regarded as environmentally substitutes for polymer composites. • The challenges and opportunities of ILMCAs as nanofillers are described. Ionic Liquids-Modified Carbon Allotropes (ILMCAs) embody an emerging class of carbon allotropes-based nanocomposite materials. The materials are associated with various salient features that qualify them for many applications. The use of ILMCAs as nanofillers in polymer coating is gaining growing attention as they strongly enhance the corrosion resistance property of polymer coating. Literature studies showed that ILMCAs manifest relatively high anticorrosive properties as compared to their constituting. For example, a study showed the IL, ROG and RGO-IL-based epoxy resin coatings demonstrate the %IE of 51.96%, 78.46% and 95.02%, respectively. In ILMCAs, ILs enhance the adhesion property whereas carbon allotropes avoid the diffusion of electrolytes. ILMCAs act as effective nanofillers than traditional polymer composite nanofillers. The use of ILMCAs can be regarded as eco-friendly substitutes for traditional nanofillers. The present perspective describes the collections and advancements in ILMCAs as nanofillers in polymer coatings.

Citric acid functionalized reduced graphene oxide containing bio‐based waterborne polyester thermoset as an excellent anticorrosive material

AbstractProtection of metal surfaces from corrosion by environmentally friendly coating is found to be an interesting and useful research topic. In this milieu, the authors presented an environment friendly bio‐based waterborne polyester thermoset as an anticorrosive organic coating. The polyesters comprise renewable resource based citric acid, dimer acid and glycerol along with citric acid functionalized reduced graphene oxide. Three different compositions of the polyester were produced by varying the amount (0.1, 0.5, and 1 weight%) of functionalized reduced graphene oxide. The structural and morphological attributes of these polyesters were evaluated by Fourier transform infrared spectroscopic, X‐ray diffraction, Raman spectroscopic, scanning electron microscopic, and transmission electron microscopic studies. The thermosets of the resinous polyesters were obtained by curing them with bio‐based glycerol containing epoxy and fatty acid modified poly(amido amine). The thermosets exhibited high tensile strength (18.68–26.94 MPa), elongation at break (176%–471%), toughness (22.74–86.5 MJ/m3), thermal stability (up to 222°C), biodegradability and chemical resistance. Potentiodynamic polarization and electrochemical impedance spectroscopic studies clearly revealed excellent corrosion resistance (impedance of the order of 107 ohm cm2 and highest phase angle of 88.2°) of the mild steel coated plates. Thus, the formulated polyester thermosets could be used as a promising environment friendly high performing anticorrosive material.

High-performance corrosion resistance of chemically-reinforced chitosan as ecofriendly inhibitor for mild steel

Finding new cost-effective and environmentally friendly anti-corrosion materials is a never-ending task. The present study is to prepare a new formulation based on chitosan derivatives with different degrees of substitution (chitosan-5-HMF) as an efficient green corrosion inhibitor to protect mild steel against corrosion in 1 M HCl. The inhibition performance of chitosan-5-HMF was determined by electrochemical tests coupled with theoretical study like as molecular dynamics (MD) simulations to assess the reactivity and adsorption mechanisms between chitosan-5-HMF and Fe. The obtained results revealed that chitosan-5-HMF3 performs excellently inhibition performance where its inhibition efficiency reached 97.01% at 200 mg/L, and it acted as an anode-based mixed inhibitor. SEM and contact angle analysis showed the formation of compact chitosan-5-HMF film on the steel surface. Molecular dynamic simulations also manifested that chitosan-5-HMF was absorbed more strongly on the metal surface in a parallel mode.

Preparation and characterization of solvent-free anti-corrosion polyurethane-urea coatings

Metal corrosion can cause severe damage to metal facilities, leading to huge economic loss. Anti-corrosion coating is considered to be effective and economic for the protection of metal facilities. Herein, a series of polyurethane-urea coatings were prepared with aromatic isocyanate, amino terminated polyether, castor oil-based polyol and polyaspartic resin as reactants and conductive mica powders as filler. The effect of isocyanate index on the chemical structure, static conductivity and corrosion resistance of the polyurethane-urea coatings were studied, and the micromorphology of the coating layers were observed. With the increase of isocyanate index, the cross-linking degree of the coating increased, while the compactness and electrostatic conductivity decreased, which was caused by the generation of carbon dioxide bubbles in the coating layer. Electrochemical impedance spectroscopy and salt spray test indicated that as the isocyanate index increased, the anti-corrosion ability of the polyurethane-urea coating on the flawless area increased, but that on the defect area decreased. The polyurethane-urea coatings prepared with isocyanate index of 1.0-1.1 possessed good corrosion resistance and electrostatic conductivity. The findings conceivably provided a new strategy to prepare solvent-free anti-corrosion coatings for the protection of metal and metallic facilities and promote the rapid development and practical application of anticorrosive materials.

Functionalized and Biomimicked Carbon-Based Materials and Their Impact for Improving Surface Coatings for Protection and Functionality: Insights and Technological Trends

Interest in carbon materials has soared immensely, not only as a fundamental building block of life, but because its importance has been critical to the advancement of many diverse fields, from medicine to electrochemistry, which has provided much deeper appreciation of carbon functionality in forming unprecedented structures. Since functional group chemistry is intrinsic to the molecular properties, understanding the underlying chemistry of carbon is crucial to broadening its applicability. An area of economic importance associated with carbon materials has been directed towards engineering protective surface coatings that have utility as anticorrosive materials that insulate and provide defense against chemical attack and microbial colonization of surfaces. The chemical organization of nanoscale properties can be tuned to provide reliance of materials in carbon-based coating formulations with tunable features to enhance structural and physical properties. The transition of carbon orbitals across different levels of hybridization characterized by sp1, sp2, and sp3 orientations lead to key properties embodied by high chemical resistance to microbes, gas impermeability, enhanced mechanical properties, and hydrophobicity, among other chemical and physical attributes. The surface chemistry of epoxy, hydroxyl, and carboxyl group functionalities can form networks that aid the dispersibility of coatings, which serves as an important factor to its protective nature. A review of the current state of carbon-based materials as protective coating materials are presented in the face of the main challenges affecting its potential as a future protective coating material. The review aims to explore and discuss the developmental importance to numerous areas that connects their chemical functionality to the broader range of applications

Effective corrosion protection by PDA-BN@CeO2 nanocomposite epoxy coatings

Adding functional inorganic two-dimensional nanomaterials is an effective means to improve the long-term anti-corrosion ability of polymer coatings. Here, due to the mussels’ adhesive ability to various substrates, polydopamine (PDA) was used to modify hexagonal boron nitride (h-BN) and a novel PDA-BN@CeO2 nanohybrid was synthesized through an in situ hydrothermal approach. X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS) were employed to characterize the as-prepared nanomaterials. The results of salt spray test and electrochemical measurement showed that the composite coatings exhibited a notable superiority in enhancing the anti-corrosion performance, in which the |Z|0.01 Hz was nearly three orders of magnitude higher than that of the neat epoxy coatings when soaked for 35 days. The enhancement mechanism can be attributed to the synergistic effect of BN nanosheets extending the corrosion medium diffusion pathway and CeO2 acting as a corrosion inhibitor to block the contact of corrosion ions with the metal substrate. This study provides a new way for the development of h-BN-based anti-corrosion materials.

РЕЗУЛЬТАТЫ ИССЛЕДОВАНИЯ ЭЖЕКТОРНЫХ ПНЕВМОПИСТОЛЕТОВ ДЛЯ ПРИМЕНЕНИЯ ПРИ КОНСЕРВАЦИИ СЕЛЬХОЗМАШИН

Ejector pneumatic pistols such as the GAV-167 and Voylet PS-5 used for the application of anticorrosive materials with large fillers. Pneumatic pistols have a receiving chamber for material input, an ejector with an air nozzle, a mixing chamber and a spray nozzle. When compressed air supplied through the ejector, a vacuum created in the receiving chamber. The research found that the vacuum pressure in the receiving chamber increased with an increase in the spray pressure, the size of the spray nozzle and a decrease in the length of the receiving chamber. The process of spraying technical liquids with a conditional viscosity from 11 to 80 seconds according to the VZ-4 viscometer has studied. The low quality of liquid spraying of the GAV-167 pneumatic pistol was noted. The liquid consumption when sprayed with a Voylet PS-5 pneumatic pistol depended on the length of the receiving chamber. With an increase in the length of the chamber from the minimum to the maximum, the consumption increased by 2 times. It proposed to set the maximum length of the receiving chamber for spraying low-viscosity material. To spray viscous material, it is necessary to set the minimum length of the chamber. Observations showed that the degree of dispersion of the material was higher at the minimum length of the receiving chamber. The Voylet PS-5 pneumatic pistol has upgraded to force the supply of material through a hose from a pressure tank. A flexible nozzle and extension have developed for applying anticorrosive material to hard-to-reach surfaces of machines.

An in-depth understanding of the solvation effect of methanol on the anisotropy of electrochemical corrosion of Ta

Although tantalum (Ta) has been studied experimentally for many years as an important anti-corrosion material, it remains a challenge to accurately predict its corrosion anisotropy theoretically. In this work, we proposed an ab initio model considering the solvation effect to investigate crystal orientation-dependent corrosion behavior of Ta. The changes in electron transfer number and energy of a tantalum atom during its dissolution from the surface in vacuum and explicit methanol molecules were studied, respectively. Based on the anodic dissolution activation energy considering solvation effect, the corrosion current densities of (200), (110) and (211) surfaces were calculated to be 3.39 × 10−8 A/cm2, 2.24 × 10−11 A/cm2 and 2.95 × 10−11 A/cm2, respectively. The results are consistent with the variation trend of peak intensity in the XRD pattern. More importantly, the corrosion current density we predicted based on the percentage of these crystalline surfaces in the polycrystalline tantalum foil is 10−7.25 A/cm2, which is very close to the experimental value (8.70 × 10−8 A/cm2). Therefore, this result is capable of providing a theoretical basis for the electrochemical machining of Ta and a new idea for studying the anodic dissolution behavior of other metals or alloys in solution.

Self-Healing Coating with a Controllable Release of Corrosion Inhibitors by Using Multifunctional Zinc Oxide Quantum Dots as Valves.

As an intelligent response system, self-healing anticorrosion materials containing nanocontainers have aroused increasing demands. It is highly expected that the nanocontainers can rapidly respond on corrosion signals to efficiently release corrosion inhibitors, meanwhile to avoid an undesirable leakage before the local corrosion happening. Herein, zinc oxide quantum dot (ZnO-QD)-sealed hollow mesoporous TiO2 nanocontainers loading with 14.2% benzotriazole (BTA) inhibitor have been successfully prepared [hollow mesoporous titanium dioxide nanospheres (HMTNs)-BTA@ZnO-QDs]. ZnO-QDs play the multifunctional roles on anticorrosion of the self-healing coating. The corrosion tests of coatings on the carbon steel well demonstrate that ZnO-QDs can not only act as a valve to seal and release BTA on the time but also act as a precursor to produce the protective film of Zn(OH)2 by the reaction of Zn2+ ions with OH- around the cathode region to inhibit the corrosion of carbon steel. After being soaked in 3.5% NaCl solution for 30 days, the |Z|0.01Hz value of the coating with HMTNs-BTA@ZnO-QDs still maintains at 2.87 × 107 Ω cm2. Once the defects are formed in the coating, the acid-responsive ZnO-QD valves are rapidly decomposed to release BTA inhibitor; meanwhile, the resulted Zn(OH)2 layer prevent the carbon steel substrate from corrosion in the cathode area. Therefore, it could be promising that the present design of the nanocontainers matching with the multifunctional ZnO-QDs can offer a valuable strategy to construct the self-healing and anticorrosion coatings with a multiresponse to the corrosion environment.