Exploitation of natural gum exudates as green fillers in self-healing corrosion-resistant epoxy coatings

Arukalam, Innocent O.; Ishidi, E.Y.; Obasi, Henry Chinedu; Madu, Izuchukwu O.; Ezeani, Emmanuel Obumneme; Owen, Macaulay M.

doi:10.1007/s10965-020-02055-y

Cited by 26 publications

(5 citation statements)

References 28 publications

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“…The survey XPS spectra in Figure 3a show that the surfaces of MPCMs and MPCMs‐2%TiO 2 are mainly composed of carbon, oxygen, and nitrogen. For C1s spectra of MPCMs and MPCMs‐2%TiO 2 shown in Figure 3b,e, the resulting curves can be fitted to three peaks centered at around 284.83, 286.88, and 288.77 eV, which are assigned to CC/CH, CO, and NCN, respectively 32,37,38 . This confirms the formation of the MF shell for microcapsules with or without addition of TiO 2 nanoparticles.…”

Section: Resultssupporting

confidence: 58%

“…For C1s spectra of MPCMs and MPCMs-2%TiO 2 shown in Figure 3b,e, the resulting curves can be fitted to three peaks centered at around 284.83, 286.88, and 288.77 eV, which are assigned to C C/C H, C O, and N C N, respectively. 32,37,38 This confirms the formation of the MF shell for microcapsules with or without addition of TiO 2 nanoparticles. For MPCMs-2%TiO 2 , two signals assigned to Ti2p 3/2 and Ti2p 1/2 are observed at the binding energy of 458.91 and 464.57 eV as shown in Figure 3d.…”

Section: Chemical Compositionsupporting

confidence: 64%

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Improvement of the rupture strength of MF shell microcapsule by incorporating TiO₂ nanoparticles with an optimal content

Dou,

Lu,

et al. 2023

J of Applied Polymer Sci

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Microencapsulated phase change materials (MPCMs) are usually subjected to internal pressure caused by core volume changes or external mechanical stress during service. It is of great importance for individual microcapsule to achieve good mechanical performance to be effective in avoiding the leakage of core material and providing crucial protection to environment. Here, n‐octadecane was selected as core material and different amounts of titanium dioxide (TiO2) nanoparticles were added into the melamine formaldehyde (MF) shell, forming n‐octadecane@MF‐TiO2 hybrid shell MPCMs by in situ polymerization. It has been confirmed that TiO2 nanoparticles had been well embedded in the network structure of MF shell. The doping of TiO2 is beneficial to the inhibition of supercooling and the improvement of the thermal stability for hybrid shell microcapsules. Microcompression tests were conducted to determine the rupture loads of prepared microcapsules. TiO2 nanoreinforcements increase the rupture loads of MF‐TiO2 shell microcapsules and the improvement percentage in rupture load reaches a maximum of 138.14% at TiO2 content of 2 wt.% compared with pristine microcapsules. Crack deflection and pinning may account for the potential strengthening mechanism of the MF nanocomposites. The reinforced MPCMs will contribute to their more promising and widespread applications in thermal energy storage systems.

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Section: Resultssupporting

confidence: 58%

Section: Chemical Compositionsupporting

confidence: 64%

Improvement of the rupture strength of MF shell microcapsule by incorporating TiO₂ nanoparticles with an optimal content

Dou,

Lu,

et al. 2023

J of Applied Polymer Sci

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“…It is well established that, metallic corrosion is a mixed process involving two redox systems, oxidation partial reaction (metal corrosion) and reduction partial reactions 30 . To prevent this unwanted process, it is essential to control both oxidation and reduction reactions.…”

Section: Resultsmentioning

confidence: 99%

Green and sustainable chitosan–gum Arabic nanocomposites as efficient anticorrosive coatings for mild steel in saline media

Kiey

Hasanin²,

Heakal³

2022

Sci Rep

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The application of green and sustainable anticorrosive coatings is becoming of upsurge interest for the protection of metallic materials in aggressive environments. Herein, a stable crystalline chitosan/gum Arabic composite (CGAC) nanopowder was successfully synthesized and characterized by various methods. The CGAC nanopowder with different doses (25, 50, 100, and 200 ppm) was used to coat mild steel samples and examined its anticorrosion ability in 3.5 wt.% NaCl solution using gravimetric, electrochemical measurements, and surface characterization techniques. All methods yielded consistent results revealing that nanocomposite coatings can impart good anticorrosive properties to the steel substrate. The obtained protection efficiency was enhanced with increasing CGAC dose in the applied surface layer achieving 96.6% for the 200 ppm-coating. SEM and AFM surface morphologies of uncoated and coated samples after the inundation in the saline solution showed that CGAC coating can block the active corrosive sites on the steel surface, and prevent the aggressive Cl- ions from attacking the metallic substrate. The water droplet contact angle gave further support as it increased from 50.7° for the pristine uncoated surface to 101.2° for the coated one. The current research demonstrates a promising natural and reliable nanocomposite coating for protecting mild steel structures in the marine environment.

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“…Thus, the corrosion resistance of the coating is adversely affected. [35] The impedance modulus value of the Bode impedance diagram at 0.01 Hz (F min = 0.01 Hz) is often used as a semi-quantitative index of corrosion resistance. The larger semiquantitative index, the better the corrosion resistance.…”

Section: Barrier Propertiesmentioning

confidence: 99%

Self‐healing corrosion‐resistant coatings based on fluorinated alkyl silane microcapsules

Wang

et al. 2022

Polymer Engineering & Sci

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In this study, microcapsules are prepared by in situ polymerization using the repairing agent fluorinated alkyl silane (FAS) as the core material and urea‐formaldehyde as the covering shell. Self‐healing coatings (FEP coatings) with repairing ability in water are prepared by adding FAS microcapsules in an epoxy resin matrix. The morphology, composition, and thermal properties of the microcapsules are studied. In addition, electrochemical impedance spectroscopy is used to study the barrier properties and self‐healing properties of the coating. The results show that FEP coating has good self‐healing ability, with the semiquantitative index of 105 Ω·cm2, which is greater than that of pure epoxy coating (EP coating). This is because that FAS leaked from the microcapsules reacts with water molecules to form a dense water‐insoluble film, which blocks the contact of corrosive ions with the substrate and inhibits the progress of metal corrosion. Moreover, the scratch width and depth results of the FEP coating after self‐healing also confirm the formation of the new film by FAS.

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Exploitation of natural gum exudates as green fillers in self-healing corrosion-resistant epoxy coatings

Cited by 26 publications

References 28 publications

Improvement of the rupture strength of MF shell microcapsule by incorporating TiO₂ nanoparticles with an optimal content

Improvement of the rupture strength of MF shell microcapsule by incorporating TiO₂ nanoparticles with an optimal content

Green and sustainable chitosan–gum Arabic nanocomposites as efficient anticorrosive coatings for mild steel in saline media

Self‐healing corrosion‐resistant coatings based on fluorinated alkyl silane microcapsules

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Exploitation of natural gum exudates as green fillers in self-healing corrosion-resistant epoxy coatings

Cited by 26 publications

References 28 publications

Improvement of the rupture strength of MF shell microcapsule by incorporating TiO2 nanoparticles with an optimal content

Improvement of the rupture strength of MF shell microcapsule by incorporating TiO2 nanoparticles with an optimal content

Green and sustainable chitosan–gum Arabic nanocomposites as efficient anticorrosive coatings for mild steel in saline media

Self‐healing corrosion‐resistant coatings based on fluorinated alkyl silane microcapsules

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Product

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Improvement of the rupture strength of MF shell microcapsule by incorporating TiO₂ nanoparticles with an optimal content

Improvement of the rupture strength of MF shell microcapsule by incorporating TiO₂ nanoparticles with an optimal content