•Application of graphene coatings to metal anti-corrosion is reviewed.•Corrosion resistance and existing problems of pure graphene coating are presented.•Physical and chemical dispersion methods of ...graphene are introduced.•Anti-corrosion mechanism of graphene composite coatings is summarized.•Future development directions for graphene anti-corrosive coatings are proposed.
Graphene has attracted significant attention for applications in many industrial fields due to its excellent anti-corrosion properties, and a series of satisfactory results have been achieved. In recent years, the scope of research into graphene-based anti-corrosive applications has been extremely diversified and encompasses two aspects: pure graphene coatings and graphene composite coatings. In this study, the application of graphene coatings to metal anti-corrosion is comprehensively reviewed. First, the preparation methods for graphene and pure graphene coatings are described in detail. Second, the corrosion resistance, existing problems, and optimizations of pure graphene coating are presented. Third, methods for improving the dispersibility of graphene, such as chemical modification and surface decoration nanoparticles, are introduced. Next, the corrosion resistance, anti-corrosion mechanism, existing problems, and optimization measures of graphene composite coatings are summarized. Finally, future development directions for graphene anti-corrosive coatings are proposed, and their viability in near-future applications is discussed.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
The Zn metal anode is considered one of the most promising anode choices for aqueous Zn‐based batteries. Nevertheless, dendrites and intricate side reactions have hindered its usage. Herein, an ...elastic and anti‐corrosive interlayer is introduced to address the problem. The idiosyncratic dielectric behavior of amorphous and nanostructured silicon nitride (Si3N4) is utilized to manipulate the ion kinetics, by uniformly dispersing its particles in polyacrylonitrile (PAN) to fabricate an interlayer attached to Zn metal (PSN‐Zn). PAN serves as an elastic constraint to inhibit drastic dendrite evolution and blocks H2O/O2 corrosion, and Si3N4 with a high dielectric constant can facilitate the ion kinetics and endow uniform Zn deposition. The electrochemical stability and deposition consistency of the Zn anodes are greatly improved, with an extended lifespan of over 800 h at 1 mA cm−2. Even under draconian deep‐discharging (DODZn = 60%) and high current density (10 mA cm−2), the PSN‐Zn anode can still operate stably for over 250 h. The effect of the dielectric property is systematically discussed and verified by experiments and theoretical simulations. Moreover, full cells with vanadium‐ and manganese‐based cathodes also deliver excellent performance, indicating the use of the multifunctional interlayer as an appealing approach for rechargeable aqueous zinc batteries.
Side reactions and dendrites can be effectively suppressed by coating an anti‐corrosive and Zn‐ion‐regulating interlayer on the Zn anode. In the layer, polyacrylonitrile acts as an H2O/O2 barrier, and amorphous Si3N4 nanoparticles with special dielectric properties can enhance ion kinetics and endow uniform Zn deposition. The Zn anodes with the coating can deliver good performance even under harsh cycling conditions.
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
This review discusses the recent progress in graphene-based anti-corrosion coatings with emphasis on the shared and distinct protection mechanisms in different coating systems.
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•The ...anti-corrosion mechanisms of graphene-related coatings are overviewed.•The shared and distinct role of graphene in various coating systems are summarized.•Future research directions for graphene-based anti-corrosion coatings are proposed.
Graphene has attracted considerable attention as anti-corrosion material due to its peculiar two-dimensional nanostructure and superior physicochemical properties. Graphene nanosheets can be independently or concertedly applied as the barriers against metal corrosion in the form of thin films, layered structures, or composites. Numerous attempts have been made to establish the correlation between the nanoscale structure and macroscale performance of graphene. In that regard, experimental and computational methods, such as quantum chemistry and molecular simulation, allow one to gain insight into the anti-corrosion mechanisms of graphene-related coatings. This review summarizes up-to-date knowledge about pure graphene and graphene-based composite coatings, including cathodic protection and self-healing coatings. Particular attention is paid to the structure–property relationship and anti-corrosion mechanisms in these systems. Finally, the shared and distinct role of graphene in various coatings and their prospects for future research are discussed as well.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Scaling is an ineluctable challenge facing humanity in industrial production. Although superhydrophobic coatings have been proven to possess anti-scaling effects, they are generally limited by ...fragile mechanochemical durability. Herein, a thermoplastic polyurethane (TPU)/polyvinylidene fluoride (PVDF)/microcapsules (MCs)/nanocarbon fiber (CNF) composite coating with superhydrophobicity (water contact angle of 155°) and superoleophilicity (oil contact angle of 0°) has been successfully prepared by spraying method. The scale inhibitor of EDTA-Zn was encapsulated in polyurea@SiO2 shell via Pickering emulsion polymerization route. Owing to the sustained release of EDTA-Zn and the shielding oil layer formed by capturing oil molecules, the prepared coating is capable of inhibiting the adhesion of CaCO3 scale nucleation and inducing the growth of aragonite CaCO3 scale, which is more likely to detach from the coating surface compared to calcite. Thus, in simulated oil field production fluid, the prepared coating demonstrated excellent anti-scaling property with an extremely low CaCO3 deposited weight of 0.072 mg/cm2. Simultaneously, because of the stable shielding oil film on the coating surface, the prepared coating exhibited excellent corrosion resistance, with a low Icorr of 7.39 × 10−9 A/cm2 and a corrosion rate of 8.06 × 10−5 mm/year. In addition, the prepared coating also shown excellent mechanical durability, anti-fouling and self-cleaning qualities. We anticipate that our work will offer a new approach to the development and production of industrial anti-scaling and anti-corrosion coatings.
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•A superwetting composite coating with slow-release property is prepared.•Polyurea microcapsules with EDTA-Zn scale inhibitor are successfully synthesized.•The coating exhibits excellent anti-scaling property due to the chelation of EDTA-Zn.•The prepared coating with oil film shielding possesses excellent anti-corrosion performance.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
In this work, an in-situ self-grown nano-ZnO/epoxy-based slippery lubricant liquid-injected porous surface (SLIPS) coating with a unique bilayer structure is reported to achieve robustness, ...hydrophobicity, and anti-corrosion properties. Dense epoxy coated ZnO nanoparticles are used as the anti-corrosion barrier layer. Self-grown ZnO nanorods provide a robust micro- and nano-rough porous structure. The lubricant perfluoropolyether (PFPE) is strongly locked into the porous structure via low surface energy material pretreatment and capillary effect. This SLIPS coating has a high water contact angle (WCA) value and has excellent repellency to various liquids. The SLIPS surface maintains a high contact angle of more than 115° even after 20 days of immersion in corrosive solutions and withstand the erosion of corrosive solutions with pH = 3. It also has a very low corrosion current density of 8.97 × 10−12 A/cm2 and the Rct (the charge transfer resistance) of optimum SLIPS remained 1.41 × 108 ohm cm2 after 70 days immersion in 3.5 wt% NaCl solution, which is in the same order of magnitude as the initial value. The SLIPS coating with excellent mechanical stability, super-hydrophobicity, anti-fouling, chemical stability, and long-term corrosion resistance performance possesses tremendous application potential in long-term corrosion protection of Mg alloys.
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•ZnO nanorods obtained by hydrothermal showed robust mechanical stability.•Fluorinated surface texture captured lubricating oil and obtained slippery property.•The slippery coating can withstand corrosive salt solution with pH = 3.•The lubricant layer plays a vital role in long-term anti-corrosion.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Metal corrosion is the degradation of a metal due to its reaction with the environment. One of the most effective ways of securing metal surface from corrosion is the use of corrosion inhibitors. ...Surfactants are an important category of corrosion inhibitors that have intrinsic amphiphilicity. The anticorrosion efficacy of surfactants is closely related to their chemical composition, molecular structure, and adsorption affinity on the metal surface. This review first summarizes the corrosion inhibition mechanism of surfactants and elucidates the influence of charge properties and structural characteristics on their corrosion inhibition efficiency, and then discusses the recent development of novel surfactants for metal anticorrosion application. Next, the synergistic effects of surfactants and other materials for metal anticorrosion are elucidated. We finally discuss the problems and challenges for the development of surfactant corrosion inhibitors and give a perspective in this field, hoping to provide help for future research.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
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•Perfluorooctanoic acid-adopted PANI (PFOA/PANI) nanoparticles are highly hydrophobic.•PFOA/PANI nanoparticles show excellent dispersibility in ethanol.•Hydrophobic and dispersible of ...PANI nanoparticles improve barrier effect of coatings.•Dedoped PFOA molecules could adsorb on steel to form corrosion inhibition effect.•Barrier, passivation and corrosion inhibition synergistically enhance anti-corrosion.
Perfluorooctanoic acid doped polyaniline (PFOA/PANI) nanoparticles were successfully prepared through ultrasonication-assisted oxidation polymerization. The prepared PFOA/PANI nanoparticles exhibited high hydrophobicity and good dispersibility in ethanol, which could uniformly distribute in epoxy resin (EP) coatings to enhance their anti-penetrant efficiency towards corrosive media. The corrosion protection properties of PANI-contained coatings on Q215 steel were evaluated and compared through electrochemical impedance spectroscopy measurements in brine. The experimental results demonstrated the PFOA/PANI/EP coatings possessed higher corrosion performance than the EP coatings and HCl-doped PANI-contained EP coatings. Besides, dedoped PFOA molecules from PFOA/PANI nanoparticles can be adsorbed on the surface of steel to form a hydrophobic corrosion inhibition layer, which further improves the corrosion resistance. The impedance of PFOA/PANI/EP coatings continuously increased after the coatings were immersed in brine for more than 2 days, and the impedance modulus at 0.01 Hz was higher than 6 × 108 Ω·cm2 after 9 days. The novel method for the preparation of hydrophobic PANI nanoparticles proposed in this work may provide new ideas and methods for developing more high-performance anti-corrosion materials and promoting their applications in corrosion protection.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
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•The application status of electrodeposited superhydrophobic coatings are concluded.•The mechanism of process conditions to regulate the coating property is described.•New ...developments in electrodeposited superhydrophobic coatings are presented.•The deficiency and future research directions of this technology are pointed out.
In recent years, superhydrophobic materials have shown tremendous industrial application value in many fields. Especially in the field of anti-corrosion, the superhydrophobic coating can capture the air to form many "air bags" on the surface of the substrate, so it has a strong water-repellent ability, thus isolating the corrosion media and achieving remarkable anti-corrosion performance. Various preparation technologies of superhydrophobic coatings have been proposed, but each has its own defects. As a relatively mature industrial processing method, electrodeposition shows unique advantages. However, there are few reviews on the preparation of anticorrosive superhydrophobic coatings by electrodeposition till now. In this paper, the general theory of superhydrophobic surface, including factors affecting wettability and theoretical wetting models, is firstly reviewed. Secondly, the mechanism, application status and anti-corrosion performance of superhydrophobic coatings prepared by metal electrodeposition, non-metallic electrodeposition, and composite electrodeposition are summarized in detail, respectively. The internal mechanism of process conditions, especially crystal modifiers, to regulate the coating morphology is described. Moreover, new developments over the years in electrodeposition such as pulse electrodeposition, magnetic field-induced electrodeposition, ultrasonic-assisted electrodeposition for the fabrication of superhydrophobic coatings are also presented. Finally, the deficiency of this technology is pointed out, and the future research directions of improving the durability of superhydrophobic coatings are proposed.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
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•Man-made superhydrophobic surfaces and coatings using hydrocarbon waxes comprehensively reviewed.•Wax-based composite coatings incorporating polymers, ceramic nanomaterials and ...carbon nanostructures described.•Reports on anti-corrosion, anti-fouling, paper and textile, food, oil separation, and biomedical applications debated.•Wax-based superoleophobic surfaces discussed.
Inspired by the superhydrophobicity of the waxy layer on lotus leaves, researchers are in constant pursuit in fabricating advanced wax-based superhydrophobic surfaces. This article comprehensively reviews reported studies on human-made superhydrophobic surfaces and coatings where natural or synthetic hydrocarbon waxes are employed. Followed by a brief introduction on superhydrophobicity and waxes, available information on wax-incorporated superhydrophobic surfaces are systematically presented based on their application area, viz. anti-corrosion and anti-fouling, paper and textile, wood and plastic, food industry, oil separation, and others. Wax-based superoleophobic surfaces are also described. Both wax-only cases and wax-incorporated formulations along with polymers, ceramic nanomaterials and carbon nanostructures are covered. Future scopes of R & D presented.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
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•Combination of epoxy paint and superamphiphobic coating provides long-term protection for Mg alloys.•Mg alloy shows high stability during 70 d 3.5 wt% NaCl immersion and 35 d neutral ...salt spray tests.•Differences of superhydrophobic and superamphiphobic coatings in anti-corrosion are revealed.•Corrosion resistance of super anti-wetting coatings in neutral salt spray test is improved.
Magnesium (Mg) alloys have many unique properties but suffer from poor corrosion resistance. Effective anti-corrosion strategies are highly desirable for widespread applications of Mg alloys. Bioinspired super anti-wetting coatings are promising for metal protection, but are limited by some issues. Here, we report a bi-layer superamphiphobic coating for efficient protection of Mg alloy by sequentially spray-coating a conventional epoxy anti-corrosion coating and a superamphiphobic coating (perfluorodecyl polysiloxane modified SiO2). The coating showed excellent anti-corrosion performance owing to high superamphiphobicity and “synergistic effect” of the bi-layer structure. The coating retained excellent anti-corrosion performance even after 70 d immersion and 35 d neutral salt spray tests. The long-term anti-corrosion performance is superior to a superhydrophobic coating with similar initial anti-corrosion performance, and better than reported and commercial anti-corrosion coatings. This is because the coating maintained high superamphiphobicity in the corrosion tests owing to high chemical stability of the C-F groups and easy roll off of small NaCl drops. Hence, the contact area and contact time of NaCl on the coating are limited. So, the coating could effectively block diffusion of corrosive substances, providing long-lasting efficient protection. We believe that the strategy will shed a new light on designing novel anti-corrosion coatings.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
