Effect of Graphene Oxide Decorated With Synthesized Nano-CeO2 on Barrier Properties of Epoxy Anticorrosion Coatings (original) (raw)
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Elsevier, 2023
Polymer-based coatings are widely used as a protective barrier to corrosion, but their performance is not sufficiently sustainable for industrial applications due to the formation of micropores and microcracks during solidification. Graphene is a promising reinforcing element acting as a filler for polymeric coatings. This study used 1-5 wt% graphene synthesized by the electrochemical exfoliation process as a reinforcing nanofiller to manufacture graphene-reinforced epoxy nanocomposite (GREN) coatings. Copper was used as a substrate material for coating with GREN by a bar coating method. GREN coatings were characterized by X-ray diffraction, Raman spectroscopy, FTIR spectroscopy, FESEM, and EDX. A comprehensive investigation was conducted on the various multi-physical properties of GREN coatings, including coating thickness, surface roughness, adhesiveness, surface wettability, water absorptivity, thermal stability, electrical conductivity, and anti-corrosion capabilities. The results exhibited that graphene fills micro-pores produced in epoxy during solidification. The surface roughness significantly decreased to 0.25 µm with the addition of 5 wt% graphene in pure epoxy. In addition, the adhesiveness, thermal stability, and electrical conductivity of GREN coatings increased with the increase in graphene content. The GREN coatings containing 3 wt% and 5 wt% graphene revealed hydrophobic surface showing 94 • and 102 • water contact angle, respectively. In the electrochemical analysis and immersion test in 3.5 % NaCl solution for 600 h, the GREN coatings showed higher corrosion resistance without compromising their electrical conductivity compared to the pure epoxy. Based on the results, GREN can be a promising coating material for aerospace, mining, and electronic packaging applications. Apart from this, the results of this work will explore the new significance in industry, where multi-physical properties from a single nanocomposite coating are crucial.
Effect of nanoparticles on the anticorrosion and mechanical properties of epoxy coating
Surface & Coatings Technology, 2009
Homogeneous epoxy coatings containing nanoparticles of SiO 2 , Zn, Fe 2 O 3 and halloysite clay were successfully synthesized on steel substrates by room-temperature curing of a fully mixed epoxy slurry diluted by acetone. The surface morphology and mechanical properties of these coatings were characterized by scanning electron microscopy and atomic force microscopy, respectively. The effect of incorporating various nanoparticles on the corrosion resistance of epoxy-coated steel was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. The electrochemical monitoring of the coated steel over 28 days of immersion in both 0.3 wt.% and 3 wt.% NaCl solutions suggested the beneficial role of nanoparticles in significantly improving the corrosion resistance of the coated steel, with the Fe 2 O 3 and halloysite clay nanoparticles being the best. The SiO 2 nanoparticles were found to significantly improve the microstructure of the coating matrix and thus enhanced both the anticorrosive performance and Young's modulus of the epoxy coating. In addition to enhancing the coating barrier performance, at least another mechanism was at work to account for the role of the nanoparticles in improving the anticorrosive performance of these epoxy coatings.
Chemical engineering transactions, 2019
Development of coating durability and sustainability for industry to facilitate the corrosion potential minimization attract much attention in recent year. The selection of appropriate coating material is necessities to improve corrosion protection of metal. Epoxy nanocomposite coatings filled with different amount of graphene nanoplateles (GNP) and montmorillonite (MMT) was prepared via mechanical agitation process to enhance the flame retardancy and anticorrosion performance of mild steel substrates. Salt fog test, limiting oxygen index (LOI) and water absorption result reveal that embedding a small amount of filler remarkably improved anticorrosion performance and flame retardancy of epoxy nanocomposite coatings. Present study suggests a development of nanocomposite coating with superior mechanical properties which was evaluated by adhesion tape test.
Polymers, 2020
In this paper, the graphene oxide loaded with nano titanium dioxide (TiO2–GO) was synthesized through 3-isocyanatopropyltrimethoxysilane (IPTMS) and characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and dispersion test. The results illustrated our modification was successful and TiO2–GO was transferred from hydrophilic to hydrophobic. That greatly enhanced the dispersity of TiO2–GO in epoxy through the observation of the coating morphology test. Moreover, the impact of TiO2–GO on anti-corrosion property in epoxy was investigated by Electrochemical Impedance Spectroscopy (EIS). Comparing to pristine particles including GO and TiO2, TiO2–GO could more significantly improve the resistance of corrosion with the help of IPTMS. Furthermore, the anti-corrosion mechanism of TiO2–GO in epoxy was tentatively proposed and discussed.
Anticorrosion Properties of Epoxy/Nanocellulose Nanocomposite Coating
BioResources
Nanocellulose (NC) is an attractive reinforcement agent that can be incorporated into protective coatings because it is a renewable, biodegradable, and biocompatible polymer resource. In this study, a series of epoxy resin-based nanocomposites were prepared in the form of coatings with various amounts of NC loadings, and the coatings were applied onto mild steel at room temperature. The characterizations of the NC and nanocomposites were performed via X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), and Fourier transform infrared spectroscopy (FTIR). The thermophysical properties of the nanocomposites were evaluated using differential scanning calorimetry (DSC) and thermogravimetry (TGA) analyses. The transparency of the nanocomposite specimens was examined by ultraviolet visible (UV-Vis) spectroscopy in the range of 300 to 800 nm. The corrosion protection properties of the coated mild steel substrates immersed in a 3.5% NaCl solution were studied comparatively by electrochemical impedance spectroscopy (EIS). The results showed that all of the nanocomposite coatings with NC noticeably influenced the epoxy-diamine liquid pre-polymer, both physically and chemically. Furthermore, the 1 wt.% NC nanocomposite coating system was found to have the most pronounced anti-corrosion properties, as confirmed by a 30-day EIS study.
SN applied sciences, 2021
The purpose of this paper was determining the effects of two nanoparticles additions in a commercial epoxy coating system on rheology characterization. Two kinds of hybrid organic-inorganic silicates (benzytallowdimethylammonium salts with bentonite) were studied, APA, with C 14-16 organic chain and, HT, with C 2-4 organic chain. A 2 2 factorial design, with two categorical nanoparticules factors was applied. The experimental data of viscosity were fit to three different rheological constitutive models: Herschell-Bulkley, Carreau-Yasuda and Cross. The best fit was obtained by Herschel-Bulkley model. The APA nanoparticle had substantial changes in yield stress values, but no effect was observed when HT had been isolated. Two thixotropic models were analyzed for the epoxy system, and the better performance was observed for the model with two rheological parameters. The presence of nanoparticule in epoxy coating reduced around 40% the recovery time. The addition of nanoparticules changes the rheological properties of a commercial coating. The X-Rays Diffraction analyses were done to observe the dispersions degree and exfoliations in the epoxy system. The crystalline peak of nanoparticles had lost for all coating formulations. The electromagnetic interference shielding attenuation was 60% in the formulations with high content of both nanoparticles. The APA and HT improved hence, the anticorrosion performance of the epoxy coating for 720 h in chloride solution. Corrosion resistance had the best performance in the coating with high concentration of carbon black and nanoparticles.
Express Polymer Letters, 2022
In this study, graphene nanoplatelets (GNPs) were synthesized from graphite by a liquid-phase exfoliation (layer separation) method, and their surfaces were functionalized with poly(glycidyl methacrylate) (PGMA) by using the rotatingbed plasma-enhanced chemical vapor deposition (PECVD) method. Fourier-transform infrared spectroscopy (FT-IR), Raman spectroscopy, scanning electron microscopy (SEM), X-ray powder diffraction (XRD), and thermogravimetric (TGA) analyses were performed to characterize the unmodified (u-GNP) and modified GNP (PGMA-GNP). Epoxy nanocomposites were prepared with both types of GNPs at different loading levels (0.1-2% by weight). The role of the surface modification of the GNPs on the mechanical, thermal, electrical conductivity, contact angle, water sorption, and corrosion properties of the epoxy nanocomposite coatings was also investigated. Consequently, the tensile strength and Young's modulus of the epoxy resin (ER)/PGMA-GNP nanocomposites were enhanced by 10.2-20 and 3.3-18.4%, respectively, as compared to the ER/u-GNP composites. Moreover, the nanocomposites prepared with PGMA-GNP had better water sorption and wettability properties than those prepared with u-GNP, but lower electrical conductivity. The corrosion test results showed that the addition of GNPs to epoxy effectively improved the corrosion resistance of the epoxy composites in high salinity, basic, and acidic environments.
Anti-corrosion carbon-based composite epoxy coating for marine industry
Corrosion and biofouling are severe global problems that cost hundreds of billion dollars annually. The protective coating is the most widespread technology among various methods used in anti-corrosion and anti-fouling. Traditional coating materials (e.g., Crbased, Zn-based, or biocide-containing anti-corrosive/fouling coatings) suffer from poor performance, environmental hazards, and high cost. This project aims to develop coating materials with carbon nanomaterials additives that provide triple protection (anti-corrosion, anti-fouling, and anti-decay) and are also environmentally friendly, non-cytotoxic, low cost, and long-lasting. In this manuscript, the performance in the corrosion protection of the graphene oxide-based and carbon nanotubes-based composite coatings were investigated. Based on the literature review, the corrosion mechanism is complex, and a number of factors affected on it, such as coating composition, environmental conditions, and design. Several mechanisms of the corrosion protection are described, cathodic and anodic protection, inhibitors and coatings, which were chosen as an object of the investigation due to the most comprehensive anticorrosion technology. Composite coatings consist of binder, pigments, solvent, and additives. The first two components are the most important in the anti-corrosion protection. For the marine industry, the most common binder is epoxy resin and polyurethane. Bisphenol A epoxy resin was used to control the cost-effectiveness of the development coating. Different pigments can provide anti-corrosion protection, but the carbon-based pigments are the most perspective one, therefore was used as an object for this research work. Carbon-based materials are excellent materials for applications in the coating due to its exceptional chemical inertness, outstanding mechanical strength, non-cytotoxicity, and unique antibacterial/anticorrosive properties. Besides graphene oxide (GO), other carbon nanomaterials such as nitrogen-doped graphene oxide (N-GO), cylindrical and conical carbon nanotubes (cyl-, con-CNT), nitrogen-doped carbon nanotubes (N-CNT) are chosen and synthesized for anti-corrosion pigment purpose, and physicochemical properties of Abstract ii materials are explored to have better understanding of the nature of the pigment. It was hypothesized that nitrogen doping of the carbon nanomaterials would improve the protection properties. This thesis focused on the investigation of the influence of the carbon-based materials on the coating and coating performance under different aggressive conditions, which are described in four chapters. The first chapter described the performance of the carbon-based coatings system in the 3.5% NaCl solution. The effect of the different carbon-based materials on the coating performance is introduced, and the electrochemical parameters were investigated. It was found that nitrogen contain decreases the corrosion rate in four times, however, carbonbased pigments-in only two times in comparison with pure epoxy coating. Secondary, the impact of the ultraviolet radiation on the coating degradation was explored, and the degree of the coating degradation was calculated. It was shown that carbon-based pigments absorb the UV radiation and prevent the coating from deterioration. The carbon nanotubes due to the structure provide better prevention form the UV radiation and pitting corrosion. In the third part, the effect of the immersion to the sodium chloride solution was studied. The importance of the structure of the pigment materials and its composition was established. The nitrogen-doped carbon nanotube composite coating showed the lowest absorption volume, and corrosion rate, and however the nitrogen-doped graphene oxide composite coating absorbs much water it still decreases the corrosion rate, prevent the pitting corrosion and hydrolytic degradation. Finally, the coating behavior under weathering degradation was explained, and the mechanism of the protection by the nitrogen-doped pigments was formulated. The novelty of this research is that the impact of the structure and composition of the carbon-based nanomaterials were studied, as well as using nitrogen-doped graphene oxide and nitrogen-doped carbon nanotubes as anti-corrosion pigment was reported for the first time. The recommendation for future research, such as investigation of the concentration and nitrogen percentage influence on the protection properties are suggested to reach the highest effectiveness of the coating. This fundamental study is the first step in solving the global problem of corrosion.
Cerium Dioxide Nanoparticles as Smart Carriers for Self-Healing Coatings
Nanomaterials
The utilization of self-healing cerium dioxide nanoparticles (CeO2), modified with organic corrosion inhibitors (dodecylamine (DDA) and n-methylthiourea (NMTU)), in epoxy coating is an efficient strategy for enhancing the protection of the epoxy coating and increasing its lifetime. Fourier transform infrared (FTIR) spectroscopy analysis was used to confirm the loading and presence of inhibitors in the nanoparticles. Thermal gravimetric analysis (TGA) measurement studies revealed the amount of 25% and 29.75% w/w for NMTU and DDA in the nanoparticles, respectively. The pH sensitive and self-release behavior of modified CeO2 nanoparticles is confirmed through UV-vis spectroscopy and Zeta potential. It was observed, through scanning electron microscopy (SEM), that a protective layer had been formed on the defect site separating the steel surface from the external environment and healed the artificially created scratch. This protective film played a vital role in the corrosion inhibition...
Progress in Organic Coatings, 2019
Graphene nanoplatelets (GNPs) dispersed in low quantity in a waterborne epoxy resin enhance the coating anticorrosive properties and strongly contrast its photooxidative degradation. The study of the photooxidative behaviour monitored until 600 h, highlights a very relevant result from an applicative point of view. A low percentage of GNPs (1% by weight) determines a reduction in the increase of the carbonyl groups amount of 78 wt% compared to the unfilled sample. Furthermore, a low quantity of GNPs incorporated in the organic coating reveals a significant enhancement in the corrosion resistance, as demonstrated by electrochemical analysis. Results show that the greater the amount of GNPs the slower the absorption. Equivalent electrical circuits, by means of the "two-parallel-layer" model, are used to interpret the electrochemical behaviour, considering the complex nature of the waterborne and inhibitors free coating. A new promising strategy is foreseen for enhancing the performance of the coating service life.