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Review

Recent Advances in Graphene Oxide-Based Anticorrosive Coatings: An Overview

by
Mădălina-Ioana Necolau
1 and
Andreea-Mădălina Pandele
1,2,*
1
Advanced Polymer Materials Group, University Politehnica of Bucharest, Gh. Polizu Street, 011061 Bucharest, Romania
2
Department of Analytical Chemistry and Environmental Engineering, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Gheorghe Polizu 1-7, 011061 Bucharest, Romania
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(12), 1149; https://doi.org/10.3390/coatings10121149
Submission received: 26 October 2020 / Revised: 3 November 2020 / Accepted: 23 November 2020 / Published: 25 November 2020
(This article belongs to the Special Issue Recent Advances in Nanostructured Polymer and Inorganic Coatings)
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Abstract

:
The present review outlines the most recent advance in the field of anticorrosive coatings based on graphene oxide nanostructures as active filler. This carbonaceous material was extensively used in the last few years due to its remarkable assets and proved to have a significant contribution to composite materials. Concerning the graphene-based coatings, the synthesis methods, protective function, anticorrosion mechanism, feasible problems, and some methods to improve the overall properties were highlighted. Regarding the contribution of the nanostructure used to improve the capability of the material, several modification strategies for graphene oxide along with the synergistic effect exhibited when functionalized with other compounds were mainly discussed.

1. Introduction

Coatings have become one of the most widespread applications for polymeric materials. They can be applied to various substrates in order to conserve and protect the main function of a material [1,2]. In addition to the protective and decorative purposes, researchers have focused their attention on developing functional coatings capable of delivering additional functions such as anticorrosive, super hydrophobic, antifouling, self-healing, thermal-resistant, and antimicrobial capability [3,4,5,6,7,8].
Organic coatings came as an efficient solution to protect the metallic substrates by building a physical border between them and the environmental conditions that sustain the deterioration of the reactive materials [9]. However, there are still some deficiencies such as local defects, pinholes, microcracks, or pores, which can allow the small ions to diffuse within the polymeric coating and induce the corrosion [10,11].
The protection mechanism exhibited by the coating for metal surfaces is related to the adsorption between the contact surfaces and the material involved in the process and also to the chemical processes that occur when the system is exposed to aggressive conditions and an erosive environment. Another important aspect that needs to be considered is the diffusion pathway for the corrosive species as well as the corrosion rate [12].
Corrosion has been a serious threat to both the economy and society for decades, as it affects some of the most used materials in terms of structural applications. It is an electrochemical process that mostly affects the metallic materials resulting in oxidation of their surfaces and is recognized as one of the most significant problems within the field of coatings [13]. Many protection approaches have been proposed to impede or suppress metal corrosion, and among them, anti-corrosion organic coatings are one of the most powerful techniques.
Anticorrosive coatings can be classified based on the mechanism of protection that they possess [14,15], and the most known are barrier protection [16,17], anodic passivation [18], cathodic protection [19], electrolytic inhibition [20,21], and active corrosion inhibitors [22,23]. The main objective for all these approaches is to decelerate or entirely hinder the main electrochemical phenomena that lead to corrosion.
The latest research studies demonstrate that the incorporation of functional nanoparticles can combat and even prevent the corrosion occurrence and are also capable of enhancing the lifetime of the coating. Nanostructures such as silicon dioxide (SiO2) [24,25], carbon nanotubes (CNT) [26,27], zinc oxide (ZnO) [28,29], zirconium dioxide (ZrO2) [30], gold nanoparticles [31], silver nanoparticles [32], cerium dioxide (CeO2) [33], titanium dioxide (TiO2) [34], montmorillonite nanoparticles (MMT) [35], graphene oxide (GO) [36], and cerium oxyhydroxides (Ce-H2O2) [37] are some examples of active agents that were investigated for their anti-corrosion properties.
Graphene is a recent discovered allotrope form of carbon that inspired the scientific world and broadened the field of application for composite materials due to its distinguished highly specific surface area, mechanical, electrical, and thermal properties [38,39,40,41,42,43,44]. The practical use of graphene is limited because of the costs generated by the production methods, its poor solubility, and its tendency to agglomerate when used in composite formulations [45]. Thus, graphene oxide became a strong alternative due to the strength of its structural similarities with graphite. This oxidized form of graphene possesses superior mechanical strength, chemical, and thermal stability. Graphene oxide has been considered a promising nanomaterial in barrier applications. This molecule does not allow the diffusion of small atoms or compounds thanks to the high density of the constituent electrons of the honeycomb-like structures from the planar sheet [46].
The basis of its outstanding properties resides in its chemical configuration, which consists of a two-dimensional sheet of a semi aromatic network made of sp2 carbon atoms organized in an ideal hexagonal pattern. A very significant particularity for this carbonaceous material is the existence of numerous defects on its basal plane such as different oxygen-containing functional groups including epoxide, carboxyl, and hydroxyl. These oxygenated groups are responsible for many advantages such as increased solubility, hydrophilicity, and the ability to form a stable colloidal solution, and they also provide the possibility of performing various functionalization reactions on the basal plane [45,46,47,48]. Figure 1 shows the most significant features for graphene oxide.
When used in a composite, GO often assemble into a three-dimensional layered sheet that sustains the integrity of the coating by hindering the exchange of volatile compounds with the external environment. In addition to its chemical inertness, electrical conductivity, and intrinsic impermeability, the size of the graphene flakes has a considerable influence over the performance of the coating [49,50].
Various approaches have been explored in order to use graphene oxide for coatings, which proved to be a promising anti-corrosion agent in high-temperature and aqueous environments. The most notable ones include electrophoretic deposition (EPD) [49], chemical vapor deposition (CVD) [46], solution dip coating [47], spin coating [1], and spray coating [2]. Electrophoretic deposition can be used with graphene oxide due to its exceptional thermal and electrical properties, and it is often used for anti-corrosion application. Table 1 summarize the main characteristic for the methods used for fabrication of GO-based coatings.
All the methods presented above entail substantial drawbacks, and they can be applied to a limited number of substrates. In this regard, a great research interest was attracted by the possibility of designing organic composite coatings that can integrate the carbonaceous structure, emphasizing the functions of both polymer and nanostructure.

2. Functionalization Agents for Graphene Oxide in Order to Be Used as Anticorrosive Agent

Therefore, on account of the previously mentioned properties, this revolutionary material can be used in the synthesis of advanced composite coatings by combining the capability of restricting the permeability of water and aggressive species with other extraordinary features of polymeric materials.
There is a considerable number of published works on GO polymer composites for anticorrosive applications, and the recent ones focused on the possibility of tailoring and modifying the surface features of graphene oxide in order to obtain advanced materials by various strategies, most of them based on both chemical and physical interactions [60,61,62,63].
Graphene oxide has the capability of ensuring the coatings when used as filler with hydrophobic features and can also diminish the adsorption and migration of corrosive media, which effectively improve the corrosion resistance of the composite coating.

2.1. Organic Compounds Modification of Graphene Oxide

Due to its nanometric dimensions and remarkable properties, graphene oxide proved to be an ideal candidate for nanocomposite formulations based on polymeric materials, as it has been demonstrated that better properties are achieved when the nanostructures used do not aggregate and exist within the matrix in a well exfoliated manner [64,65,66].
To ensure that graphene can effectively increase the properties of the polymeric matrix, it needs to have a uniform distribution. However, the main difficulty in the employment of GO nanosheets as a desirable reinforcing material in polymeric matrices arises from the interaction via hydrogen bonding between the functional groups existing on the basal plane of the nanosheets, which further generates agglomeration. Thus, only by performing a suitable functionalization is it possible to accomplish a homogeneous dispersion of the nanostructures.
The oxygen-containing functionalities on the GO surface can act as bonding sites, which provide the possibility of performing additional modifications of the surface. Various functional groups can be attached to the graphene oxide from the oxygenated groups to develop versatile characteristics.
The covalent modification of the GO surface has numerous advantages such as the formation of strong interactions, which will lead to superior thermal and mechanical properties and also to a high efficiency of load transfer for the material. In this context, the extended π conjugation of the GO nanosheets does not undergo any changes during the process [67,68,69,70].
The non-covalent surface treatment of graphene oxide can modify the hybridization of the carbon structure from sp2 to sp3, which increases the number of defects on the basal plane and affects the mechanical properties of GO nanosheets [71,72,73].
The chemical modification of graphene oxide with dodecylamine (GO-DDA) [74] led to an increase of 12.39% for the percentage protection efficiency when used in a composite formulation for aircraft anticorrosive applications. Even 1.2% of GO-DDA is capable of impeding the growth of cracks and reducing the pathway of corrosion media to the metal surface. A very important parameter that need to be taken into consideration when designing an anticorrosive coating is the hydrophilicity of the material used. The high content of polar groups (hydroxyl, epoxy, and carboxyl) on the graphene oxide surface can facilitate the absorption and diffusion of water, and this aspect has an unfavorable effect over the barrier property. The efficiency of this system was evaluated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques after immersion in 3.5 wt.% NaCl. The results showed that both nanostructures act as a barrier to impede the permeation of corrosive electrolytes.
Sodium tripolyphosphate, a water-soluble linear polyphosphate, was chemically attached by graphene oxide to accomplish a novel anti-corrosive pigment (STG) with uniform dispersion in water-borne epoxy (EP) [75]. The corrosion resistance of the STG/EP coating on carbon steel substrates was investigated via electrochemical measurements and a salt spray test for different concentrations of STG pigment. The particularity of the mechanism for this system resides in the capability of the tripolyphosphate to form a passive film through the chelation with the metallic ions from the substrate [76]. The salt spray test results demonstrate that 0.7% STG added in an epoxy matrix had superior corrosion resistance in comparison with 0.7% graphene oxide/epoxy nanocomposite.
Reduced graphene oxide was successfully modified with polyamidoamine dendrimer (GO-PAMAM) and was used as the active filler in an epoxy matrix to obtain a high-performance anti-corrosion system [77]. The results of electrochemical impedance spectroscopy (EIS) and salt spray test demonstrated that using 0.2 wt.% GO-PAMAM enhanced the corrosion protection properties of the epoxy coating. As it can be seen in Figure 2, the incorporation of GO-PAMAM into the epoxy matrix significantly reduced the corrosion products and diminished the coating delamination.
PAMAM contributes to the improvement of the dispersion quality of graphene oxide flakes and enhances the interfacial interactions. Due to the high specific surface area and good dispersion, GO-PAMAM sheets might considerably increase the diffusion pathway length for various electrolytes, which promote corrosion and also obstruct the defects and pores present in the coating network. In addition to the above-mentioned advantages of PAMAM, the polar amino groups of this molecule can chemically interact with epoxide groups of the resin, increasing in this way the cross-linking density of the coating. This aspect leads to the enhancement of the barrier properties of the coating.

2.2. Macromolecular Compounds Modification of Graphene Oxide

There is a significant interest in the development of high-performance anticorrosive coatings that are capable of combining the properties of the nanostructure and the polymeric matrix. Such composite systems based on graphene oxide have been studied and they include polymers such as benzoxazine, polyaniline, polyurea, polyurethane, and epoxy resin, which is the most used and effective polymeric material in the coatings industry [78,79,80,81,82]. Polymeric materials tend to form a high adhesive barrier due to the fact that they can chemically interact by covalent bonding to different substrates. Graphene–epoxy nanocomposites have been the major point of interest for many studies because of their superior actions. The epoxy resin is popular among other polymeric materials for its coating function, excellent adhesion to a large number of substrates, high tensile strength, superior mechanical properties, high chemical stability, and good corrosion resistance.
Polymers-grafted GO sheets have attracted the extensive interest of researchers based on their outstanding advantages. By this method, one can incorporate the properties of GO nanostructures and polymers, obtaining a homogeneous distribution of the reinforcing agent within the polymeric matrix and one also can tailor and design the features of the desired material.
Polyacrylate functionalized GO (PA-GO) was successfully synthesized by free-radical copolymerization technology and used as active filler for corrosion in an epoxy resin matrix [83]. The electrochemical tests confirm that the corrosion resistance of epoxy coating containing PA-GO was significantly increased in comparison with neat epoxy. The corrosion rate of the epoxy nanocomposite coating was almost three times lower, suggesting that the incorporation of PA-GO consolidates the corrosion protection capacity of the epoxy coating. Figure 3 presents the anticorrosion mechanism exhibited by the PA-GO system.
In this aspect, Zhu et al. [84] synthesized graphene oxide/polyaniline (GO/PANI) by the in situ polymerization of aniline on the graphene oxide surface in order to increase the hydrophobicity. Along with that, an increased anticorrosive capability and electrical conductivity was achieved when 1.5% GO/PANI was integrated in an epoxy coating and electrochemical analysis was performed on the sample immersed in a 5 wt.% NaCl. Polyaniline nanofibers (PANI) were intercalated with cationic reduced graphene oxide (RGO+) and used as an anticorrosive agent in water-borne polyurethane coatings [85]. The results of electrochemical analysis revealed that the lowest value for the corrosion current density was obtained when a 50:50 wt.% ratio of PANI:RGO+ was used.
Polypyrrole (PPy) is another example of a polymer that was used for the graphene oxide functionalization and showed a significant synergistic effect toward the anti-corrosion mechanism when it was used as filler in a 0.5% epoxy resin [86].
The protective mechanism of the GO-PPy is illustrated in Figure 4. In the case of a neat epoxy coating, the diffusion of corrosive species occurs along the thickness of the material (Figure 4a). The oxidative reactions that take place at the interface induced the delamination of the coatings from the metal, which will further cause the loss of the protective ability.
While GO embedded within the coating matrix show only a reduced hinderance effect (Figure 4b), in the case of a GO-PPy nanocomposite, the perpendicular arrangement of the nanosheets to the layer of coating provides a devious pathway for corrosive species that impedes the advent of the corrosion. The amino functional groups from the PPy backbone generate an additional crosslinking effect toward the epoxy coating. By increasing the crosslinking density of the polymeric network, the occurrence of micro-pores along the coating decreases, thus increasing the barrier properties (Figure 4c).
Ramezanzadeh et al. [87] developed a nanoplatform with superior anti-corrosive action built up through a one-pot synthesis method of zeolitic imidazolate framework-8 (ZIF-8) on the graphene oxide sheets. The particles applied on a steel sample showed a corrosion inhibition efficiency of about 79% when immersed in a NaCl solution by polarization tests.
Recent studies in the design of coatings focus on the strategy of combining different corrosion inhibition mechanisms in a synergetic way through a single coating system aiming to increase the lifetime of the structural components and to offer protection against corrosive environments. The association of graphene with proper nanomaterials can be a productive way to adjust and strengthen the adsorption and anti-corrosion assets of graphene in order to work as an excellent corrosion inhibitor.
Hyper-branched polymers represent a class of three-dimension macromolecular compounds that possesses a generous number of end-functional groups and finds applicability in anticorrosive coating. In comparison with linear polymers, dendritic macromolecules exhibit superior physical and chemical properties [88,89]. Their specific spheroid-like configuration, compact configuration, and high density of the functional group makes them suitable to interact with the oxygen functionalities that exist on the basal plane of graphene oxide nanoflakes [90].
Hydroxyl-terminated hyper-branched polyamide was used to functionalize graphene oxide (HB/GO) by non-covalent interaction and was used as anticorrosive active filler for epoxy film [91]. The authors concluded that the hyper-branched polyamide had a prominent role in the improvement of the dispersion of graphene oxide sheets within the polymeric coating and also contributes to the increase of the adhesion properties. All these features along with electrochemical tests and salt spray experiment support the corrosion protection enhancement exhibited by this nanostructure.

2.3. Inorganic Compounds Modification of Graphene Oxide

In addition to the above-mentioned functionalization agents, there is another class of compounds capable of enhancing the mechanical properties of the nanocomposite materials. Inorganic compounds attached onto the graphene oxide surface are able to improve the barrier effect and the resistance to external factors [92].
Ye et al. [93] studied the anticorrosive effect of covalently modified polyhedral oligomeric silsesquioxane–graphene oxide (POSS-GO) when used in epoxy composite coatings in a marine environment. When they compared the neat epoxy system with the GO-POSS/epoxy nanocomposite, they concluded that by adding only 0.5% of nanostructure, the barrier effect and long-term anti-corrosion capability was significant increased. The particularity of this system resides in the capability of filling the morphological defects present in the coating and also to hamper the diffusion path for the corrosive species. Figure 5 depicts the morphology of the epoxy coatings after explosion to corrosion.
Graphene oxide decoration proved to be an effective approach to improve various characteristics due to the synergistic effects that occur when different nanoparticles are used. Lv et al. [94] used ZrO2 to cover both sides of reduced graphene oxide (rGO) and proved by electrochemical analysis performed in a 3.5% NaCl medium that the incorporation of only 0.5 wt.% of this nanostructure ZrO2-rGO in an epoxy matrix generates a uniform and defect-free anticorrosive coating with a resistance value of 81.8 GΩ\bulletcm2.
A novel anticorrosive material with a stable structure was developed by Xue [95] by in situ bonding technology between graphene oxide and hydroxyapatite (GO/HAP). This advanced nanostructure is capable of obstructing the charge transfer and hindering the permeating path of the aggressive species. The anticorrosive mechanism of this formulations resides in the synergistic effect between its components. Graphene oxide has the ability to collect the electrons generated during the corrosion process, while HAP is capable of immobilizing the militant Cl− ions and generating stable chlorapatite. Thus, by adding 0.6% GO/HAP into an epoxy matrix, the impedance value increased by 754.4% as compared with the neat epoxy sample.
Aiming to develop advanced nanostructures, Nguyen [96] used molybdate intercalated hydrotalcite (HT-MoO4) to functionalize the surface of graphene oxide (GO) in order to obtain an anticorrosive effect for the carbon steel substrate. The efficiency of this system is given by the capability of molybdate to act as an inhibitor when released from the graphene oxide surface. Electrochemical tests were performed in a NaCl solution, and the results showed that the incorporation of 1 wt.% HT-MoO4/GO in an epoxy matrix granted anodic and cathodic hinderance effects for carbon steel with an efficiency of 96%. The mechanism of this system relies on the particularity of molybdate, which can form an insoluble layer of ferrous-ferric molybdates at the steel surface. GO improved the barrier properties by preserving the protective tint formed by HT-MoO4/GO structures.
Another approach proposed by Sharifi et al. [48] studies the anti-corrosive effect of graphene oxide modified with nitrogen, sulfur, and phosphorous atoms (NPS-GO) incorporated in melamine formaldehyde and urea formaldehyde, which are water-soluble polymeric compounds.
The mechanism of this system is based on the capability of the heteroatoms attached to the graphene surface to be absorbed by the surface of the covered substrate when dispersed in an aqueous medium. Due to the presence of these corrosion inhibitor nanoparticles, both graphene oxide and the active nanostructures adsorb on the surface concomitantly. In this case, graphene oxide acts as a supplementary coating for corrosion inhibitor moieties and entraps them on the metallic substrate; subsequently, the protective layer becomes thicker and more resistant (Figure 6) [48].
Aluminum GO composite coatings were studied by Kumar et al. [97] in terms of the anticorrosive action on the copper substrate. The integration of GO into the Al matrix significantly improves the morphology of the surface by reducing the structural defects of the coating and ensuring it with a compact nature. In addition to the action of the graphene oxide toward the morphology of the coating, it also affects the desired orientation of Al crystallites. The GO-embedded Al coating demonstrated a 60% reduction in corrosion [97].
Zinc coatings on steel substrate are considered one of the most effective ways to combat corrosion action. However, the main drawback of this sacrificial coating is represented by its reduced lifetime; thus, an alternative method would be the formulation of a composite material with a Zn matrix. Starting from this hypothesis, Zn-GO composite coatings were obtained by Azaret et al. [98] and evaluated regarding the microstructure and corrosion behavior. In addition, a supplementary brightening additive was added in order to improve the surface morphology of the coating and to create a glossy aspect. Both graphene oxide and the brightening additive led to an increase of the adhesion strength of the Zn-GO nanocomposite coating, which was two times higher than that of the pure Zn coating.
The anti-corrosion action of the Zn-GO composite coating was assessed by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), potentiometric and salt spray tests in air saturated 3.5 wt.% NaCl solution. Polarization measurements revealed that the inclusion of graphene changed the coating morphology and resulted in a finer structure, which improves the resistance of the coating to the diffusion of corrosive ions such as Cl− [99].

3. Conclusions

The present review depicts the most recent advance in the field of anticorrosive coatings with graphene oxide nanostructures from both perspectives—formulation and activity. An important parameter that needs to be taken into consideration when synthesizing an anticorrosive coating is the hydrophilicity. The presence of oxygen-containing functionalities on the graphene oxide basal plane can promote the absorption and diffusion of water molecules, leading to an unfavorable aspect over the barrier properties. For that, various functionalization approaches including several organic and inorganic agents such as dodecilamine, polypyrrole, polyacrylate, polyaniline, benzoxazine, polyurea, polyamidoamine dendrimer, sodium tripolyphosphate, POSS, hydroxyapatite, molibdate, aluminium, and zinc were used to overcome the previously mentioned drawback.
The modified graphene oxide with hydrophobic features has the ability to diminish the absorption and migration of corrosive species and also can improve the corrosion resistance of the composite materials.
All types of synthesis methods for graphene oxide-based coatings were presented, and also, a large number of specifically applications, involving nanocomposite coatings, were detailed and discussed. Each system was analyzed from the perspective of anticorrosive capacity in various conditions and the protective mechanism exhibited by the reinforcing agents within the polymer or inorganic matrix used in each case.
The main mechanism involved in corrosion protective composite coatings containing graphene oxide depends on the matrix used. Thus, for polymeric materials, the processing and curing might generate local defects in the structure which can promote the penetration of corrosive agents within the material structure. The diffusion pathway for electrolytes can be hindered by using functionalized graphene oxide, which can also act as a barrier at the material surface.

Author Contributions

Conceptualization, M.-I.N. and A.-M.P.; resources, M.-I.N. and A.-M.P.; data curation, M.-I.N. and A.-M.P.; writing original draft preparation, M.-I.N.; project administration, A.-M.P.; funding acquisition, A.-M.P. All authors have read and agreed to the published version of the manuscript.

Funding

The researchers acknowledge funding by the Romanian Research Project 40PCCDI/2018 NAPOLI19, subproject no. 1–“Innovative process for obtaining titanium nitride ceramics via composite polymer hybrids for biomedical applications-BIOTiN” and the project number PN-III-P1-1.1-PD-2016-0761, PN-III-PD 59/2018.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. Morphological and structural characterization of graphene oxide (a) Atomic Force Microscopy (AFM), (b) Field Emission Scanning Electron Microscopy (FESEM), (c) High-resolution transmission electron microscopy (HR-TEM), (d) Raman Spectrometry, (e) X-ray photoelectron spectroscopy (XPS), and (f) X-ray diffraction (XRD). (Adapted with permission from ref. [48] 2020 Elsevier).
Figure 1. Morphological and structural characterization of graphene oxide (a) Atomic Force Microscopy (AFM), (b) Field Emission Scanning Electron Microscopy (FESEM), (c) High-resolution transmission electron microscopy (HR-TEM), (d) Raman Spectrometry, (e) X-ray photoelectron spectroscopy (XPS), and (f) X-ray diffraction (XRD). (Adapted with permission from ref. [48] 2020 Elsevier).
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Figure 2. Salt spray test results for the (A1–A3) blank epoxy, (B1–B3) graphene oxide (GO)/epoxy and (C1–C3) graphene oxide was successfully modified with polyamidoamine dendrimer (GO-PAMAM)/epoxy composites after (A1,B1,C1) 7 days, (A2,B2,C2) 14 days, and (A3,B3,C3) 21 days exposure to the salt spray test (Adapted with permission from ref. [77] 2020 Elsevier).
Figure 2. Salt spray test results for the (A1–A3) blank epoxy, (B1–B3) graphene oxide (GO)/epoxy and (C1–C3) graphene oxide was successfully modified with polyamidoamine dendrimer (GO-PAMAM)/epoxy composites after (A1,B1,C1) 7 days, (A2,B2,C2) 14 days, and (A3,B3,C3) 21 days exposure to the salt spray test (Adapted with permission from ref. [77] 2020 Elsevier).
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Figure 3. The corrosion mechanism of epoxy resin reinforced with PA-GO (Reprinted with permission from ref. [83] 2020 Elsevier).
Figure 3. The corrosion mechanism of epoxy resin reinforced with PA-GO (Reprinted with permission from ref. [83] 2020 Elsevier).
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Figure 4. The protective mechanism of GO-PPy (polypyrrole) in anticorrosive formulations (Reprinted with permission from ref. [86] 2020 Elsevier).
Figure 4. The protective mechanism of GO-PPy (polypyrrole) in anticorrosive formulations (Reprinted with permission from ref. [86] 2020 Elsevier).
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Figure 5. The morphology of the coatings after a corrosion test (a) Epoxy coating (EP); (b) 0.5% Graphene oxide/Epoxy coating (GO/EP); (c) 0.5% POSS-GO/Epoxy coating (PG/EP); (d) 1% POSS-GO/Epoxy coating (PG/EP). (Reprinted with permission from ref. [93] 2020 Elsevier).
Figure 5. The morphology of the coatings after a corrosion test (a) Epoxy coating (EP); (b) 0.5% Graphene oxide/Epoxy coating (GO/EP); (c) 0.5% POSS-GO/Epoxy coating (PG/EP); (d) 1% POSS-GO/Epoxy coating (PG/EP). (Reprinted with permission from ref. [93] 2020 Elsevier).
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Figure 6. The decoration of GO sheets with heteroatoms (Reprinted with permission from ref. [48] 2020 Elsevier).
Figure 6. The decoration of GO sheets with heteroatoms (Reprinted with permission from ref. [48] 2020 Elsevier).
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Table
Table 1. Pure graphene coatings for corrosion protection.
Table 1. Pure graphene coatings for corrosion protection.
MethodSubstratesAdvantagesDisadvantagesRef.
Electrophoretic deposition (EPD)Steel
Copper
Carbon steel		-Cost effectiveness
-Uniform deposition
-Good control of coating thickness
-Anti-corrosion applications		-Poor adhesion of GO to the substrate
-The anti-corrosion performance may vary depending on electrodeposition parameters, and chemical composition of the precursor		[49,51,52,53]
Chemical vapor deposition (CVD)Copper
Nickel
Steel		-Anti-corrosion applications
-Increase the electrical conductivity of Ni		-Poor adhesion strength to the substrate
-High costs
-Sophisticated equipment
-High temperature of the process		[54,55]
Solution dip coatingNickel
Aluminum		-Cost effectiveness
-High processability without the help of any additives
-Easy to scale-up		-The properties of the final coating depend on the coverage degree[56,57,58,59]
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Necolau, M.-I.; Pandele, A.-M. Recent Advances in Graphene Oxide-Based Anticorrosive Coatings: An Overview. Coatings 2020, 10, 1149. https://doi.org/10.3390/coatings10121149

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Necolau M-I, Pandele A-M. Recent Advances in Graphene Oxide-Based Anticorrosive Coatings: An Overview. Coatings. 2020; 10(12):1149. https://doi.org/10.3390/coatings10121149

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Necolau, Mădălina-Ioana, and Andreea-Mădălina Pandele. 2020. "Recent Advances in Graphene Oxide-Based Anticorrosive Coatings: An Overview" Coatings 10, no. 12: 1149. https://doi.org/10.3390/coatings10121149

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