High Anticorrosion Properties Research Articles

ФИЗИКО-ХИМИЧЕСКИЕ СВОЙСТВА МОДИФИЦИРОВАННЫХ БИТУМНЫХ ПРАЙМЕРОВ ДЛЯ ПРОТИВОКОРРОЗИОННОЙ ЗАЩИТЫ СЕЛЬСКОХОЗЯЙСТВЕННОЙ ТЕХНИКИ И ОБОРУДОВАНИЯ

Compositions based on bitumen primers can be used for anti-corrosion protection of agricultural machinery and equipment. Their physicochemical properties were studied. It has been shown that the thickness of coatings, which is responsible for the effectiveness of barrier protection, increases as expected with an increase in the number of applied coating layers, and decreases even with a slight increase in temperature and with an increase in the amount of solvent in the case of coating by dipping. Increasing the amount of solvent added to the bitumen primer from 40 wt. % up to 67 wt. % leads to a reduction in coating thickness by 55 times. Brush application produces thinner finishes than dip application. Moisture absorption for modified BP with 67 wt. % solvent is 1-2 orders of magnitude higher than that of BP with 40 wt. % white spirit, therefore, a decrease in protective effectiveness can be expected for these materials. According to experimental studies, the contact angles for the original BP exceed 900C, which indicates the presence of hydrophobic properties. The type and concentration of additives affect the contact angles. Introduction 5 wt. % of modifying additives, paraffin P2 and Emulgin, reduces the contact angle of BP, the addition of KO-SZhK, on the contrary, increases it, improving hydrophobic properties. BP with 40 wt. % white spirit, including those with additives, shows good adhesion to carbon steel 0.8 kp. At 67 wt. % solvent in the presence of drying oil and unrefined sunflower oil additives, adhesion worsens. Viscosity-temperature dependences in semi-logarithmic coordinates for modified BP are close to linear in the temperature range 20 -60 0C with a high approximation reliability index R2 = 0.9543 - 0.9833. Based on the physicochemical properties, high anti-corrosion properties can be assumed.

Study of Anti-Corosion Properties of Pigments Fe2O3-Al2O3-MgO Obtained by Coprecipitation

Promising pigments of the passivating type, in addition to phosphate ones, are other materials - oxyhydroxides, ferrites, molybdates, stanates, borates, tungstates, which are obtained using traditional technologies. condition. Researchers are becoming increasingly interested in the co-precipitation method, which makes it possible to vary the cationic and anionic composition of pigments and obtain nanodispersed products. In addition, developers of paints and varnishes are faced with the task of replacing toxic anti-corrosion chromium-, cadmium- and plumbum-containing pigments that are part of most modern inhibitory primers with pigments that are safe for human health. An alternative to such paint and varnish materials are oxide type fillers, which are anti-corrosion pigments, including oxyhydroxides, magnesium ferrites, cobalt aluminates, zinc ferrites, copper ferrites, magnesium aluminates, zinc aluminates, etc. The color of pigments and their anticorrosion properties depend on the chromophore ions included in the structure of the resulting compounds.Co-precipitation technology has a number of advantages over traditional ones and can radically reduce the cost of producing oxide materials. This process, based on the use of the internal chemical energy of the system, allows synthesis to be carried out at reduced temperatures, synthesis duration and energy costs. The simplicity of the equipment, the possibility of synthesizing a significant amount of the product of the desired phase and granulometric composition, and the environmental friendliness of the process also indicate the feasibility of using this method. Recently, attempts have been made to obtain pigments by co-precipitation, but no systematic studies have been carried out on the final products. The resulting products were in most cases poorly reproducible. In this regard, it becomes interesting to synthesize in a mode that would make it possible to obtain pigments with good color characteristics in a finely dispersed state, and eliminate the labor-intensive grinding stage, study the conditions for the formation of pigments with the structure of oxyhydroxides, the influence of their composition on color and anti-corrosion properties, study the patterns of formation of anti-corrosion properties, development of compositions for producing pigments using the co-precipitation method and subsequent heat treatment. Through experimental and theoretical studies, the influence of the nature of chromophore cations on the color tone, color purity, and anti-corrosion properties of pigments in the Fe-Al-Mg-O system has been established, which allows for the targeted synthesis of beige, red and yellow pigments with high anti-corrosion properties. The main technological properties of pigments are determined by the composition of metal-containing anions. The anti-corrosion properties of oxyhydroxide pigments are largely determined by the presence of hydroxide ions formed due to dissociation. The greatest effect is observed in the case of using metal compounds whose dissociation constants differ significantly. The protective effect is mainly determined by the slowdown of the anodic process. At the same time, anions containing aluminum atoms accelerate corrosion processes.

The semi-continuous (Mg,Al)2Ca second phase on Mg-Al-Ca-Mn alloys as an efficient anti-corrosion anode for Mg-air batteries

Developing high anti-corrosion and good discharge properties of magnesium based alloys for Mg-air batteries is still in challenge. In this work, a series of Mg-Al-Ca-Mn (AMX) alloys are prepared, and the second phases on AMX alloys are adjusting by varying the Al content. The AMX alloys with 3 wt% Al (denoted as AMX311) exhibits the excellent anti-corrosion behavior with a corrosion current density of 85.7 μA cm−2 and a low corrosion rate (4.1±0.21 mm y−1) in the 3.5 wt% NaCl solution. Furthermore, AMX311 shows lower hydrogen evolution volume (20.9±1 ml/cm2) and weight loss (5.8±0.3 mg) compared to other contrast samples. The outstanding electrochemical corrosion performance of AMX311 is attributed to the Al-rich oxide film which slowing corrosion at the initial stage and the formation of semi-continuous (Mg,Al)2Ca phase which can acts as a physical barrier to prevent the electrolyte from further corroding the magnesium matrix. Moreover, the AMX311 exhibits the highest discharge voltage (-1.471 V) and a peak specific energy of 1684.7±30.0 mW h g−1 at 20 mA/cm2, due to its superior corrosion resistance and reduced chunk effect. This work provides a good guide for designing advanced Mg-based alloys and an excellent insight into the effect of second phase on the corrosion and discharge performance of Mg-air batteries anode materials.

Влияние добавок карбида и борида вольфрама на структуру и микротвердость эквиатомного CrFeNi-покрытия, сформированного короткоимпульсной лазерной наплавкой

A coating based on a single-phase medium-entropy CrFeNi alloy with a face centered cubic structure has good ductility, relatively high anti-corrosion properties, low cost, but insufficient strength for its widespread use. It is assumed that adding strengthening particles in the form of tungsten carbides and borides to the CrFeNi equiatomic coating will lead to an increase in its mechanical properties. This work studies the influence of tungsten carbide and boride additives on the structure and microhardness of a CrFeNi equiatomic coating. The coatings were formed by layer-by-layer short-pulse laser cladding with preplaced powder on a multifunctional laser installation equipped with a solid-state laser with a lamp pump based on an Nd:YAG crystal. The change in phase composition when adding strengthening particles was detected using X-ray diffraction analysis and transmission electron microscopy (TEM). Both methods confirmed the precipitation of Cr23C6 chromium carbide in the deposited coatings. TEM photographs indicate that the precipitated phase is distributed along the grain boundaries of the -solid solution. The study found that the addition of 6 wt. % WC and 3 wt. % WB increases the level of microhardness of the CrFeNi coating by 26 % (from 340±6 to 430±12 HV 0.025). This occurs due to the presence of Cr23C6, WC particles in the structure and possible microdistortions of the crystal lattice of the -phase as a result of doping with tungsten atoms released during the dissolution of tungsten borides and carbides in the process of high-temperature short-pulse laser heating.

Optimization of the magnetostrictional molding composites structure

The paper presents the methodology of multi-criteria synthesis of magnetostrictive cast composites with high physical-mechanical and anti-corrosive properties. The synthesis of composites is realized by solving nonlinear mathematical programming tasks sequentially. The quality of the modeling was evaluated using the composite quality functional. The numerical methods for solving the optimization problem of the target function of kinetic processes are based on the construction of Pareto sets, penalty functions of Arrow-Hurwitz, and the method of equal estimate regions. The necessary and sufficient criteria for forming optimal recipe-technological parameters were established, allowing to obtain composites with specified structure and properties. The proposed methods were tested in the development of a practical technology for producing polymer composites with magnetostrictive properties.

Ultrafast treatment of stainless steel for efficient and stable water electrolysis

Stainless steel is widely utilized in industrial applications of alkaline water electrolysis due to its high anti-corrosion property, but it usually suffers from low catalytic activity. The complete activation of stainless steel to improve its efficiency while maintaining its excellent corrosion resistance is thus important for lowering the energy consumption of H2 production. Here, we developed an ultrafast one-step activation for stainless steel based on high-temperature heat treatment and quenching in an aqueous solution. After the activation, the resulting Ni-doped stainless-steel mat (Ni-SSM) exhibited significantly improved activity for both the hydrogen evolution reaction and the oxygen evolution reaction in comparison to pristine SSM. When assembled for overall water electrolysis, Ni-SSM delivered a current density of 100 mA/cm2 at a cell voltage of 1.72 V in 1 M KOH at 25 °C, outperforming most of the stainless-steel-based electrodes reported thus far. Under a quasi-industrial environment of 6 M KOH at 60 °C, Ni-SSM displayed extraordinary performance, producing a current density of 500 mA/cm2 at a low cell voltage of 1.615 V. Further durability testing showed that Ni-SSM maintains high performance at a current density of 500 mA/cm2 under this quasi-industrial environment for at least 150 h. Similar activation processes were applied to different substrates to verify the versatility of this strategy, and enhanced performance for alkaline water electrolysis was observed among all the selected substrates. Finally, 5 × 5 cm2 pieces of Ni-SSM were prepared and assembled in an anion exchange membrane (AEM) electrolyzer, in which they delivered a current of 12.5 A at a cell voltage of 1.93 V in 1 M KOH at 65 °C. Therefore, the effectiveness of this activation strategy for improving activity and its feasibility and versatility together suggest its great potential for industrial application.

НОВАЯ ПРОТИВОКОРРОЗИОННАЯ ПРИСАДКА «РОСОЙЛ-АКОР»

The paper contains the results of laboratory tests of a new Rosoil-Akor anticorrosive additive, designed to improve the protective properties of oils for various purposes and fuels in comparison with the similar AKOR-1 additive from two Russian manufacturers. The physicochemical characteristics of the additives are defined. The effect of additives on the protective and anti-wear properties of transformer oils, motor oils and diesel fuel are studied. It is shown that the physico-chemical parameters of Rosoil-Akor additive meets the requirements of GOST 15171-78 Additive AKOP-I. Specifications. It is found that when exposed to salt fog, the protective ability of oils and diesel fuel with Rosoil-Akor additive is 3-10 times higher than with AKOR-1 additives. At higher values of relative humidity and air temperature, the protective ability of oils and diesel fuel with Rosoil-Akor additive is up to 25 times better than with AKOR-1 additives. All the additives under study increase the anti-wear properties of transformer oils, while the diameter of the wear spot of oil with Rosoil-Akor additive is 1.2-1.4 times smaller than oils with AKOR-1 additives. The addition of the studied additives to engine oils does not significantly affect the anti-wear properties of oils. The wear index of diesel fuel decreases with the addition of Rosoil-Akor and AKOR-1 additives (sample No. 1), but increases with the addition of AKOR-1 additive (sample No. 2). Test results show that the new Rosoil-Akor additive has high anticorrosive and anti-wear properties and can be used to improve the protective properties of oils for various purposes and diesel fuel instead of AKOR-1 additive.

The Study of the Performance of the Diamond Wheel’s Steel and CFRP Hubs in Tungsten Carbide (WC) Grinding

Tungsten carbide (WC) has been widely utilized in recent years in the hardware, mechanical, and chemical industries and in national defense because of its high hardness, anti-wear, low temperature, and anti-corrosion properties. However, using it for grinding is also challenging because the WC material has high hardness and brittle characteristics. The typical hub of a diamond wheel is made of steel. In high-speed grinding, the steel hub of the diamond wheel is subjected to gravity and centrifugal forces, which cause grinding wheel vibration, poor workpiece processing quality, and a short machine life. Therefore, this study used a carbon-fiber-reinforced thermoplastic (CFRP) hub to replace the steel hub when grinding the WC workpiece. It aimed to investigate methods to reduce oscillation, improve chip efficiency, and increase accuracy in the WC workpiece. The research results demonstrated that using a CFRP hub in the grinding wheel can reduce the oscillation when the peripheral speed of the grinding wheel is at 20–100 m/s. Additionally, the surface roughness average (Ra) of the workpiece can be reduced to 3.2–25.4% and the ten-point height of irregularities (Rz) can be reduced to 18.9–44% compared to using a steel hub in the grinding wheel.

The synthesis of calcium and barium salts of carboxymethylamine-methylalkylphenol and their effect on properties of ДС -11 engine oil

The authors suggest a simple environmental-friendly method to obtain the additives with anticorrosion and washing properties. Described method is based on the interaction of hydroxides of the alkaline-earth metals with carboxymethylamine-methylalkylphenol obtained via the reaction of the industrial alkylphenol with formaldehyde and the aminoacetic acid. The effect of synthesized compounds – calcium and barium salts of carboxymethylamine-methylalkylphenol on the anticorrosion and washing properties of ДС -11 oil has been studied. It was established that they show high anticorrosion and washing performance. In 2.5% concentration of the additive, the corrosion of ДС -11oil is eliminated. The compounds studied do not worsen other properties including the viscosity index and freezing temperature of studied ДС -11 oil. It was revealed that the composition from barium salts of carboxymethylamine-methylalkylphenol and ИХП-21 additive shows high anticorrosion, antioxidation and washing properties as well.

An Engineering Method of Analyzing the Dynamics of Mass Transfer during Concrete Corrosion Processes in Offshore Structures.

The environment of an underground structure is much more complex than the above-ground environment. Erosion processes are underway in soil and groundwater; groundwater seepage and soil pressure are also typical for underground environments. Alternating layers of dry and wet soil have a strong effect on concrete, and they reduce its durability. Corrosion of cement concretes is caused by the diffusion of free calcium hydroxide, located in the pores of concrete, from the volume of the cement stone to its surface, bordering on an aggressive environment, and the further transition of the substance through the phase boundary solid (concrete)-soil-aggressive environment (liquid). Due to the fact that all minerals in cement stone exist only in saturated or close-to-saturated solutions of calcium hydroxide, a decrease in the content of which in the pores of concrete as a result of mass transfer processes causes a change in the phase and thermodynamic equilibrium in the body of concrete and leads to the decomposition of highly basic compounds of cement stone and, consequently, to the deterioration of the mechanical properties of concrete (reduction in strength, modulus of elasticity, etc.). A mathematical model of mass transfer in a two-layer plate imitating the "reinforced concrete structure-layer of the soil-coastal marine area" system is proposed as a system of nonstationary partial derivative differential equations of the parabolic type with Newmann's boundary conditions inside the building and at the interface between the soil and the marine environment and with conjugating boundary conditions at the interface between the concrete and the soil. When the boundary problem of mass conductivity in the "concrete-soil" system is solved, expressions are obtained to determine the dynamics of the concentration profiles of the target component (calcium ions) in the volumes of the concrete and soil. As a result, one can select the optimum composition of concrete, having high anticorrosion properties, to extend the durability of the concrete constructions of offshore marine structures.

An Overview of the Current State and the Advantages of using acrylic resins as anticorrosive coatings

Corrosion protection coating is one of the most common ways of protecting structures against all kinds of negative external influences. Various types of anti-corrosion coatings can be used to successfully extend the service life of products. However, conventional paints are not water-resistant coatings, and small cracks always appear over time due to temperature fluctuations. Compared to other types of coatings, acrylic coatings are less expensive and just as durable. Acrylic resins have high anti-corrosion properties as well as water resistance, impact resistance, good adhesion to the substrate and overall durability. This powerful combination of cost and performance makes acrylic coatings such a popular and sensible solution for protecting structures against corrosion. The main purpose of this review is to describe the different types of acrylic resins and compare their properties, synthesis and drawbacks. It is expected that this work will be the cornerstone for the future development of acrylic resins.

Polyamide 6 is an Integral Component of the Protective Coating for Steel ST3

In this study, an attempt was made to use PA 6 as a component of an experimental composite anticorrosive coating that increases the adhesion of hydrophobic coatings (iron stearate and zinc stearate) to protect structural steel St3. The phosphating primer leads to the formation of a film of iron salts insoluble in water on the steel surface and adsorption of PA 6 on them. Hydrophobization of the surface formed in this case zinc stearate leads to the formation of a coating with high adhesion and anticorrosive properties. Tannin is a corrosion inhibitor. The advantage of the tannin primer is that its molecules are able to bind to the metal surface and the PA 6 macromolecules simultaneously, forming a strong coating on the metal. Zinc stearate gives the coating hydrophobic properties and additional protection of the metal from corrosion.

Bio-Based Waterborne Polyurethane Coatings with High Transparency, Antismudge and Anticorrosive Properties.

Green and environment-friendly preparation are of the utmost relevance to the development of transparent antismudge coatings. To prepare a waterborne polyurethane (WPU) coating with antismudge property, it is challenging to balance the stability of dispersion and the antismudge property of coating. Herein, we prepare a transparent bio-based WPU coating grafted with a minor proportion of poly(dimethylsiloxane) (WPU-g-PDMS) using renewable castor oil, monocarbinol-terminated PDMS, hexamethylene diisocyanate trimer, and 2,2-bis(hydroxymethyl)propionic acid as raw materials. Effects of the dosage of monocarbinol-terminated PDMS, the curing temperature, and the curing time on the antismudge performance were studied. Results showed that rigorous stirring (3000 rpm) is necessary to obtain a stable WPU-g-PDMS dispersion with a storage time longer than 6 months. A high curing temperature (>160 °C) and a period of curing time (>1 h) are indispensable to obtain the excellent antismudge property because they would facilitate the grafted low-surface-tension PDMS chains to migrate from the interior to the coating surface. The facts that simulated contaminated liquids such as water, HCl solution, NaOH solution, artificial blood, and tissue fluid could slide off easily and cleanly, and marker ink lined on the coating surface could shrink, indicated that the WPU-g-PDMS coating has good antismudge properties, which could be self-compensated shortly after deterioration. Due to the high cross-linking degree caused by multifunctional polyol and isocyanate, the WPU-g-PDMS coating has high hardness and good anticorrosive performance. The antismudge functionalization and waterborne technology of bio-based polyurethane coatings proposed in this work could be a promising contribution to the green and sustainable development of functional coatings. This kind of WPU-g-PDMS coating is expected to protect and decorate electronic screens, vehicles, and buildings, especially endoscopes.

Разработка состава и технологии получения синтетического компонента основы гидравлических масел для специальной техники

The rapid development of technology, the creation of promising products with characteristics corresponding to or exceeding the characteristics of the best world analogues, dictate the need to create a new level of quality oils – synthetic. The advantages of synthetic-based oils are excellent viscosity-temperature characteristics, good low-temperature fluidity, high anticorrosive properties, as well as increased thermal-oxidative stability, compatibility with materials. Since synthetic oils are chemically stable, they retain their original characteristics longer under adverse operating conditions. Other advantages of synthetic oils include increased resistance to shear deformations (due to the uniformity of the structure), high dispersing ability, fire resistance, chemical inertia and non-toxicity. It is also important that the synthetic base requires the introduction of a minimum amount of thickening additives. In addition, their resource significantly exceeds the resource of petroleum oils of a similar purpose. Among the numerous lubricants, a special place is given to low-viscosity hydraulic oils used in autonomous hydraulic drives of special equipment. The use of a basic synthetic base makes it possible to increase the guarantees of the shelf life and operation of hydraulic oil in products and ensure a quality preservation resource for 20 years or more.

Developing new Mg alloy as potential bone repair material via constructing weak anode nano-lamellar structure

The mechanics-corrosion and strength-ductility tradeoffs of magnesium (Mg) alloys have limited their applications in fields such as orthopedic implants. Herein, a fine-grain structure consisting of weak anodic nano-lamellar solute-enriched stacking faults (SESFs) with the average thickness of 8 nm and spacing of 16 nm is constructed in an as-extruded Mg96.9Y1.2Ho1.2Zn0.6Zr0.1 (at.%) alloy, obtaining a high yield strength (YS) of 370 MPa, an excellent elongation (EL) of 17%, and a low corrosion rate of 0.30 mm y −1 (close to that of high-pure Mg) in a uniform corrosion mode. Through scanning Kelvin probe force microscopy (SKPFM), one-dimensional nanostructured SESFs are identified as the weak anode (∼24 mV) for the first time. The excellent corrosion resistance is mainly related to the weak anodic nature of SESFs and their nano-lamellar structure, leading to the more uniform potential distribution to weaken galvanic corrosion and the release of abundant Y 3+ /Ho 3+ from SESFs to form a more protective film with an outer Ca 10 (PO 4 ) 6 (OH) 2 /Y 2 O 3 /Ho 2 O 3 layer (thickness percentage of this layer: 72.45%). For comparison, the as-cast alloy containing block 18R long period stacking ordered (LPSO) phase and the heat-treated alloy with fine lamellar 18R-LPSO phase (thickness: 80 nm, spacing: 120 nm) are also studied, and the characteristics of SESFs and 18R-LPSO phase, such as the weak anode nature of the former and the cathode nature of the latter (37-90 mV), are distinguished under the same alloy composition. Ultimately, we put forward the idea of designing Mg alloys with high mechanical and anti-corrosion properties by constructing "homogeneous potential strengthening microstructure", such as the weak anode nano-lamellar SESFs structure.

INVESTIGATION OF ANTI-CORROSION PROPERTIES OF DIESEL FRACTION, CONTAINING 1,3-DIPHENYLTRIAZENE

The article considers the possibility of expanding the range of chemicals that exhibit their high anti-corrosion properties in hydrocarbons and can be used as additives to motor fuels through the use of 1,3-diphenyltriazene. This substance belongs to the class of diazocompounds and its anticorrosive properties are determined by the adsorption capacity in contact with the metal surface, due to the presence in the molecule of nitrogen-containing active groups that form a donor-acceptor (coordination) bond with the metal surface.
 Studies of anticorrosive properties were performed on metal plates (copper and steel, grade 3), located in the model environment, which consisted of straight-run diesel fraction (240-350 ° C) obtained from gas condensate with the addition of 1% of the mass. 1,3-diphenyltriazene in which was injected 0.1% of the mass. a solution of 97% acetic acid or 0.5% of the mass. aqueous solution of 10% NaCl. The anticorrosive properties of the specified model environment were studied both in static (soft) conditions at 20 ° C, periodic stirring at a speed of 100 rpm. for 90 days, and in dynamic (hard) conditions at 50 ° C, continuous stirring at a speed of 500 rpm, aeration 1.5 dm3 / min for 120 hours.
 It was found that in those samples where there was 1% of the mass. 1,3-diphenyltriazene on the surface of metal plates formed a protective film, as evidenced by the change in color of the metal plate, and the absence of signs of corrosion on the surface, as well as a slight increase in its mass (within 0.0002 ÷ 0.0003 g). In samples where there was no 1,3-diphenyltriazene corrosion rate (Km), for mild study conditions was 0.94 × 10-4 ÷ 5.16 × 10-4 g / (m2 × h), for harsh study conditions - 0.56 × 10-2 ÷ 1.07 × 10-2 g / (m2 × year).
 The approach proposed by the authors, which takes into account the complex action of several factors (temperature, mixing, aeration and the presence of corrosive agents), allows to adequately, close to the conditions that may arise during the actual operation of facilities, to assess the effectiveness of one or another chemical to protect against corrosion of metal surfaces.

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.

Hydroxyapatite Coating on Ti-6Al-7Nb Alloy by Plasma Electrolytic Oxidation in Salt-Based Electrolyte.

Titanium alloys have good biocompatibility and good mechanical properties, making them particularly suitable for dental and orthopedic implants. Improving their osseointegration with human bones is one of the most essential tasks. This can be achieved by developing hydroxyapatite (HA) on the treating surface using the plasma electrolytic oxidation (PEO) method in molten salt. In this study, a coating of titanium oxide-containing HA nanoparticles was formed on Ti-6Al-7Nb alloy by PEO in molten salt. Then, samples were subjected to hydrothermal treatment (HTT) to form HA crystals sized 0.5 to 1 μm. The effect of the current and voltage frequency for the creation of the coating on the morphology, chemical, and phase composition was studied. The anti-corrosion properties of the samples were studied using the potentiodynamic polarization test (PPT) and electrochemical impedance spectroscopy (EIS). An assessment of the morphology of the sample formed at a frequency of 100 Hz shows that the structure of this coating has a uniform submicron porosity, and its surface shows high hydrophilicity and anti-corrosion properties (4.90 × 106 Ohm·cm2). In this work, for the first time, the process of formation of a bioactive coating consisting of titanium oxides and HA was studied by the PEO method in molten salts.

Preparation and Properties of Three-dimensional Graphene-based Multifunctional Thermal Control Coating

According to the requirements of spacecraft light alloy materials for thermal control, anti-static and corrosion protection, based on the synthesized three-dimensional graphene functional filler, a multifunctional thermal control coating with high emissivity, anti-static and anti-corrosion properties was prepared on magnesium alloy materials. By testing the coating properties, the hemispherical emissivity was 0.91,volume resistivity was 104Ωm and neutral salt spray corrosion resistance was more than 800 hours.

Preparation and Properties of Three-dimensional Graphene-based Multifunctional Thermal Control Coating

According to the requirements of spacecraft light alloy materials for thermal control, anti-static and corrosion protection, based on the synthesized three-dimensional graphene functional filler, a multifunctional thermal control coating with high emissivity, anti-static and anti-corrosion properties was prepared on magnesium alloy materials. By testing the coating properties, the hemispherical emissivity was 0.91,volume resistivity was 104Ωm and neutral salt spray corrosion resistance was more than 800 hours.