Multifunctional graphitic carbon nitride/manganese dioxide/epoxy nanocomposite coating on steel for enhanced anticorrosion, flame retardant, mechanical, and hydrophobic properties

Xavier, Joseph Raj; Bhaskar, Ramesh; Subramanian, Srinivasan

doi:10.1016/j.jiec.2024.01.015

Cited by 19 publications

(1 citation statement)

References 76 publications

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“…Epoxy resins (EPs) have emerged as versatile materials, finding widespread application owing to their multifaceted advantages, including superior adhesive properties, minimal cure shrinkage, ease of manufacture, and exceptional chemical corrosion resistance. − However, the intrinsic shortcomings of EPs, notably their susceptibility to combustion and the consequential release of considerable toxic smoke, present significant hurdles to their expanded utilization. − Hence, enhancing their flame retardancy is imperative to mitigate safety concerns and facilitate their broader use …”

Section: Introductionmentioning

confidence: 99%

Hierarchical Nanospheres toward Flame-Retardant, Mechanically Strong, and Low-Toxicity Epoxy Resins

Rao,

Liu,

Zhao

et al. 2024

ACS Appl. Polym. Mater.

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To endow epoxy resins (EPs) with outstanding flame-retardant and smoke-inhibiting effects, a multifunctional nanoparticle (SCP) has been designed and prepared via a simple approach, wherein Cu 2 O, melamine, and phosphorus-containing flame retardants were successively deposited onto the surface of silica nanospheres. The incorporation of a low addition amount of 2 wt % SCP within the EP demonstrates a significant improvement in flame retardancy. This enhancement is evidenced by a notable increase in the limiting oxygen index to 29.2% and attainment of a V-1 rating in the vertical burning test, in contrast to the respective values of 23.8% and no rating for unmodified EP, respectively. Moreover, the total smoke production, peak of heat release rate, and peak production rate of CO of EP/SCP-2 during the cone calorimeter test decreased by 10.2%, 26.1%, and 37.0%, respectively. Besides, the incorporation of 2 wt % SCP also endows the EP composites with commendable mechanical properties and glass transition temperature (T g ), as evidenced by a 22.5% increase in impact strength, an 8.1% rise in tensile strength, and a 9.5% increase in T g , comparing with the unmodified EP. The flame-retardant mechanism analysis revealed that SCP functions within epoxy resin through both gas-phase and condensed-phase mechanisms. Overall, the proposed multifunctional nanoparticle strategy presents promising approaches for simultaneously enhancing the fire safety and mechanical performance of polymer materials.

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Section: Introductionmentioning

confidence: 99%

Hierarchical Nanospheres toward Flame-Retardant, Mechanically Strong, and Low-Toxicity Epoxy Resins

Rao,

Liu,

Zhao

et al. 2024

ACS Appl. Polym. Mater.

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A comprehensive investigation of oxygen/graphite carbon nitride smart Nano coatings for sustainable maintenance and sacrificial anode protection of mild steel

Morsy,

Toderas,

El‐marghany

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDThis study enhancing the corrosion resistance of mild steel (MS) by incorporating photo‐catalyst‐doped graphitic carbon nitride (g‐C₃N₄) nano‐sheets containing silver (Ag) and oxygen (O₂) into a solar light‐active photoelectrochemical anticorrosion paint with polyester (PE). The objective is to provide sacrificial anode protection through visible light activation.RESULTSThe developed paint forms a uniform film on the MS surface, effectively providing anodic protection under visible light. Characterization techniques, including energy‐dispersive X‐ray spectroscopy (EDX), transmission electron microscopy (TEM), Fourier‐transform infrared spectroscopy (FTIR), and UV–Vis spectroscopy, confirm the molecular structure of the nano‐sheets. Corrosion resistance, assessed through weight loss measurements and open circuit potential (OCP) tests, shows significant improvement with the addition of Ag/g‐C₃N₄ and Ag‐O₂/g‐C₃N₄ nano‐sheets at an optimized concentration of 15 mg. The protection efficiency is ranked as follows: O₂‐g/C₃N₄ > O‐g/C₃N₄ > Ag‐O₂/g‐C₃N₄ > Ag‐g/C₃N₄ > g‐C₃N₄. After 28 days of immersion in seawater, MS coated with O₂/g‐C₃N₄ exhibited the least weight loss, with an inhibition efficiency of up to 99%. Electrochemical impedance spectroscopy (EIS) further demonstrated enhanced coating resistance for the O₂/g‐C₃N₄ coating (Rct = 3.76 kΩ.cm2, Rcoat = 1.69 kΩ.cm2) compared to pure PE (Rct = 0.005 kΩ.cm2, Rcoat = 0.096 kΩ.cm2).CONCLUSIONThe synthesized O₂/g‐C₃N₄ and Ag‐O₂/g‐C₃N₄ nano‐sheets exhibit high surface areas and enhanced water dispersibility, which contribute to significant corrosion protection of MS. The electrochemical performance, including weight loss and OCP measurements, highlights the potential of these nano‐sheet photo‐catalysts in advancing corrosion resistance technologies, with broad implications for materials science and engineering applications. © 2024 Society of Chemical Industry (SCI).

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Highly Anti‐Corrosive Performance of Poly(Vinylidene Fluoride‐Hexafluoropropylene)/Boron Nitride Nanosheet/Polyimide Composite Coating

Meng,

Li,

et al. 2024

Macro Chemistry & Physics

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Polyimide (PI) is one of the most important engineering plastics, but its stability in aqueous environments is insufficient, which limits its anti‐corrosion efficiency. In this study, a novel P(VDF‐HFP)/SMT‐RS@BNNSs/PI composite coating is prepared by incorporating poly(vinylidene fluoride‐hexafluoropropylene) (P(VDF‐HFP)) and the exfoliated boron nitride nanosheets (BNNSs) which were highly co‐functionalized with two kinds of materials of the rosin and the soy‐maleic anhydride‐tannic acid adhesive molecules (SMT‐RS@BNNSs). The coatings are characterized in detail by using the XRD, FT‐IR, XPS, and SEM technologies. Electrochemical impedance spectroscopy (EIS) and polarization curve tests further evaluated the corrosion resistance of the coating. As results, the obtained P(VDF‐HFP)/SMT‐RS@BNNSs/PI coating with good adhesion (grade 1) to the low‐carbon steel plate displays a larger water contact angle of 93.10° compared to blank PI (75.5°) and SMT‐RS@BNNSs/PI (83.2°). The dispersed distribution and interaction of SMT‐RS@BNNSs can effectively reduce the phase separation between P(VDF‐HFP) and PI. Even after soaking in electrolyte for 15 days, the impedance modulus, corrosion current, and corrosion voltage of the P(VDF‐HFP)/SMT‐RS@BNNSs/PI coating are 1.568 × 1010 Ω cm2, 4.612 × 10−12 A cm−2, and 0.325 V, respectively. These properties are superior to those of the PI and SMT‐RS@BNNSs/PI coatings. It is believed that the excellent anti‐corrosive performance of this PI‐based composite will broaden the application fields of PI materials.

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Multifunctional graphitic carbon nitride/manganese dioxide/epoxy nanocomposite coating on steel for enhanced anticorrosion, flame retardant, mechanical, and hydrophobic properties

Cited by 19 publications

References 76 publications

Hierarchical Nanospheres toward Flame-Retardant, Mechanically Strong, and Low-Toxicity Epoxy Resins

Hierarchical Nanospheres toward Flame-Retardant, Mechanically Strong, and Low-Toxicity Epoxy Resins

A comprehensive investigation of oxygen/graphite carbon nitride smart Nano coatings for sustainable maintenance and sacrificial anode protection of mild steel

Highly Anti‐Corrosive Performance of Poly(Vinylidene Fluoride‐Hexafluoropropylene)/Boron Nitride Nanosheet/Polyimide Composite Coating

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