Self-healing behavior of epoxy-based double-layer nanocomposite coatings modified with Zirconia nanoparticles

Habib, Sehrish; Hassanein, Amani; Kahraman, Ramazan; Ahmed, Elsadig Mahdi; Shakoor, Abdul

doi:10.1016/j.matdes.2021.109839

Cited by 38 publications

(17 citation statements)

References 59 publications

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“…It is further added that the smart selection of self-healing agents, inhibitors, and smart carriers has contributed significantly to prolong the corrosion protection of steel. It is pertinent to mention here that although a few multilayered coating systems have been reported, the proposed coating system demonstrates superior self-healing and inhibition effects. The promising corrosion protection results of the proposed smart polymeric coatings make them potentially considered for corrosion protection in the oil and gas industry, seawater desalination, and other related industries, which has been a great challenge for a long time.…”

Section: Introductionmentioning

confidence: 99%

Multilevel Self-Healing Characteristics of Smart Polymeric Composite Coatings

Hassanein

Khan

Fayyad

et al. 2021

ACS Appl. Mater. Interfaces

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Smart polymeric composite coatings demonstrating multilevel self-healing characteristics were developed and characterized. The pHresponsive smart carriers were synthesized by loading halloysite nanotubes (HNTs) with the benzotriazole corrosion inhibitor (BTA) using the vacuum cycling method, referred to as (BTA-loaded HNTs). Similarly, mechanically triggered melamine urea-formaldehyde microcapsules encapsulated with the boiled linseed oil-self-healing agent (LO) denoted as (MUFMCs) having an average size of a ∼120 μm diameter with a wall thickness of ∼1.84 μm were synthesized by the in situ polymerization technique. The newly designed double-layered smart polymeric composite coatings (DLPCs) were developed by mixing 3 wt % BTA-loaded HNTs with epoxy and applying it on the clean steel substrate to form a primer layer. After its complete curing, a top layer of epoxy containing 5 wt % of MUFMCs was deposited on it. For an exact comparison, single-layer polymeric composite coatings (SLPCs) containing 3 wt % BTA-loaded HNTs were also developed. The Fourier transform infrared radiation spectra of MUFMCs and BTA-loaded HNTs indicate the existence of all desired functional groups, confirming the presence of loaded chemical species such as LO and BTA into the smart carriers. Thermogravimetric analysis (TGA) indicates that ∼18% BTA is successfully loaded into HNTs. Quantitative UV-spectroscopic analysis indicates a pH-responsive release of BTA from BTA-loaded HNTs, which is time-dependent, attaining its maximum value of ∼ 90% in an acidic medium after 30 h. Electrochemical impedance spectroscopy analysis conducted in 3.5 wt % NaCl solution at room temperature for different immersion times reveals that SLPC exhibits the maximum chargetransfer resistance (R ct ) of 55.47 GΩ cm 2 after the 7th day of immersion, and then, a declining trend is observed, reaching 26.6 GΩ cm 2 after the 9th day. However, in the case of DLPC, the R ct values show a continuous increment, attaining a maximum value of 82.11 GΩ cm 2 after the 9th day of immersion. The improved performance of DLPC can be ascribed to the efficient triggering of the individual carriers in the isolated matrices, resulting in the release of LO and BTA to form individual protective films at the damaged area due to the oxidative polymerization process and triazoles' ability of passive film formation on the substrate, respectively. The tempting self-healing properties of DLPCs justify their decent role for long-term corrosion protection in many industrial applications.

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Section: Introductionmentioning

confidence: 99%

Multilevel Self-Healing Characteristics of Smart Polymeric Composite Coatings

Hassanein

Khan

Fayyad

et al. 2021

ACS Appl. Mater. Interfaces

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“…It is critical to incorporate the constant phase element admittance instead of the capacitance, as the developed coating does not act as an ideal capacitor ( n = 1). Hence, there is a need to represent surface roughness and non-homogeneity caused by the adsorption of certain species on the metal surface, forming a passive film . Furthermore, it accommodates non-uniform current distribution throughout the coated surface …”

Section: Resultsmentioning

confidence: 99%

“…Hence, there is a need to represent surface roughness and non-homogeneity caused by the adsorption of certain species on the metal surface, forming a passive film. 47 Furthermore, it accommodates non-uniform current distribution throughout the coated surface. 57 The Bode graph and the phase angle of single-layer epoxy coating reinforced with loaded LDH (LDH-EP) are shown in Figure 13a,b.…”

Section: Methodsmentioning

confidence: 99%

“…DLPCs showed a corrosion resistance of 4.19 GΩ cm 2 after 9 days of immersion in NaCl corrosive solution. Habib et al designed a multilayered epoxy coating using zirconia nanoparticles as nanocarriers, which were loaded separately with imidazole and PEI to be applied as a prelayer and a top layer of epoxy in the steel, respectively . The developed coating showed a corrosion resistance of 1.00 GΩ cm 2 within 7 days of immersion in NaCl.…”

Section: Introductionmentioning

confidence: 99%

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Multilayered LDH/Microcapsule Smart Epoxy Coating for Corrosion Protection

Ismail,

Shakoor,

Al-Qahtani

et al. 2023

ACS Omega

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A multilayered smart epoxy coating for corrosion prevention of carbon steel was developed and characterized. Toward this direction, as a first step, zinc-aluminum nitrate-layered double hydroxide (Zn/Al LDH) was synthesized using the hydrothermal crystallization technique and then loaded with dodecylamine (DOD), which was used as an inhibitor (pH-sensitive). Similarly, the synthesis of the urea-formaldehyde microcapsules (UFMCs) has been carried out using the in-situ polymerization method, and then the microcapsules (LAUFCs) were encapsulated with linalyl acetate (LA) as a self-healing agent. Finally, the loaded Zn/Al LDH (3 wt %) and modified LAUFCs (5 wt %) were reinforced into an epoxy matrix to develop a double-layer coating (DL-EP). For an exact comparison, pre-layer epoxy coatings comprising 3 wt % of the loaded Zn/Al LDH (referred to as LDH-EP), top-layer epoxy coatings comprising 5 wt % linalyl acetate urea-formaldehyde microcapsules (referred to as UFMLA COAT), and a blank epoxy coating (reference coating) were also developed. The developed epoxy coatings were characterized using various techniques such as XRD, XPS, BET, TGA, FTIR, EIS, etc. Electrochemical tests performed on the synthesized coatings indicate that the DL-EP demonstrates improved self-healing properties compared to LDH-EP and UFMLA COAT.

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“…Nano-WO 3 particles have small particle size, insufficient atomic coordination, large specific surface area, and high surface energy, which can cause the nanoparticles to exhibit high activity, instability, and easy agglomeration [ 33 , 34 ]. Appropriate physical or chemical methods [ 35 , 36 , 37 ] must be adopted to modify the nanoparticles to obtain nanoparticles with good dispersion, small particle size, and narrow particle size distribution. High-energy ball-milling is a new surface modification method that can significantly reduce reaction activation energy, achieve grain refinement, greatly improve the activity of powder, and improve particle size distribution uniformity, and enhanced with the combination of the interface between the body, and thus improve the compactness of the material, along with its electrical and thermal performance.…”

Section: Introductionmentioning

confidence: 99%

Preparation of UV-Curable Nano-WO3Coating and Its Infrared Shielding Properties

et al. 2022

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Nano-WO3 particles are expected to find use in new shielding materials because of their significant absorption of near-infrared light in the 1400–1600 nm and 1900–2200 nm bands and high transmittance of visible light. In this study, WO3 was ground and dispersed using high-energy ball-milling to prepare a nano-WO3 dispersion using BYK331 as the dispersant and ethanol as the solvent. The prepared nano-WO3 dispersion was added to a photo-curing system and cured using UV irradiation to form films. The cured films were characterized using FT-IR, SEM, XRD, and TGA. The results showed that the nano-WO3 powder was evenly dispersed in the coating. The infrared blocking rate of the film continuously improved and the visible light transmission rate continuously decreased with increasing amounts of nano-WO3.For the film containing 6 wt%nano-WO3, the infrared blocking rate of the coating is 90%, the visible light transmittance is 70%, the hardness of the coating is 3B, and the adhesion is 3H. The thermal stability of the coating is also improved.

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Self-healing behavior of epoxy-based double-layer nanocomposite coatings modified with Zirconia nanoparticles

Cited by 38 publications

References 59 publications

Multilevel Self-Healing Characteristics of Smart Polymeric Composite Coatings

Multilevel Self-Healing Characteristics of Smart Polymeric Composite Coatings

Multilayered LDH/Microcapsule Smart Epoxy Coating for Corrosion Protection

Preparation of UV-Curable Nano-WO3Coating and Its Infrared Shielding Properties

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