Development of active barrier effect of hybrid chitosan/silica composite epoxy-based coating on mild steel surface

Wonnie, Iling Aema; Ammar, Sh.; Bashir, Shahid; Kumar, Sachin; Ramesh, K.

doi:10.1016/j.surfin.2021.101250

Cited by 20 publications

(11 citation statements)

References 91 publications

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“…That change in the release profile and the increased release rate after day 2 during Phase II can be correlated to EIS results and the controlled release of the inhibitive pigment from the capsules. As the electrolyte travels through the pores and reaches the coating/metal interface, it activates the resistance of the pores leading to the slight bending of the Bode plot (magnitude in the lower frequency range) . The decrease in the R f value after day 2 for MSN-CP3% as mentioned above can be correlated to the increased coating porosity.…”

Section: Resultsmentioning

confidence: 76%

“…As the electrolyte travels through the pores and reaches the coating/metal interface, it activates the resistance of the pores leading to the slight bending of the Bode plot (magnitude in the lower frequency range). 46 The decrease in the R f value after day 2 for MSN-CP3% as mentioned above can be correlated to the increased coating porosity. Thus, a higher amount of water reaches the coating/metal interface, more cathodic and anodic sites appear, and a higher concentration supply of the inhibitive pigment is needed to effectively suppress the corrosion reactions.…”

Section: Resultsmentioning

confidence: 77%

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Encapsulated Corrosion Inhibitive Pigment for Smart Epoxy Coating Development: An Investigation of Leaching Behavior of Inhibitive Ions

Lamprakou

Weinell

et al. 2023

ACS Omega

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A comparative study between the leaching behavior of inhibitive ions from conventionally pigmented and smart (with encapsulated pigments) epoxy coatings has been conducted. Leaching of calcium phosphate as an inhibitive pigment from epoxy coatings was tested in 3.5 wt % NaCl solution. The results showed that pigment encapsulation contributed to a more uniform and stable coating microstructure based on the Scanning Electron Microscopy–Energy-Dispersive X-ray Spectroscopy (SEM-EDX) analysis and a higher leaching rate of the inhibitive pigment via the Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) analysis, thereby enhancing both the active corrosion protection and the barrier properties of the coating film. This was further verified by the Electrochemical Impedance Spectroscopy (EIS) measurements. After 7 days of immersion in 3.5 wt % NaCl solution, the coating resistance of the smart epoxy coating with mesoporous silica nanoparticle encapsulated calcium phosphate (MSN-CP3%) was 2 × 109 Ω·cm2 compared to 1.1 × 106 Ω·cm2 and 2.6 × 106 Ω·cm2 for the conventional epoxy coatings pigmented with 3 wt % and 5 wt % calcium phosphate (CP3% and CP5%), respectively.

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Section: Resultsmentioning

confidence: 76%

Section: Resultsmentioning

confidence: 77%

Encapsulated Corrosion Inhibitive Pigment for Smart Epoxy Coating Development: An Investigation of Leaching Behavior of Inhibitive Ions

Lamprakou

Weinell

et al. 2023

ACS Omega

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“…The coating delaminated area can be evaluated via the breakpoint frequency, f b , that is a frequency at 45° phase angle, according to eq : ,, where ρ is the resistivity of the coatings, ε and ε 0 are the dielectric constant of water and the vacuum permittivity, A 0 is the total exposed area of the coatings, and A t is the exposed area, respectively. According to the equation, a higher f b for a coating system reflects a large delaminated area at the coating–steel interfaces …”

Section: Results and Discussionmentioning

confidence: 99%

Bio-inspired Multifunctional Graphene–Epoxy Anticorrosion Coatings by Low-Defect Engineered Graphene

2022

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Although graphene has been regarded as the most ideal anticorrosion filler, to date, some vital problems including poor dispersion, disordered arrangement, structure defects, and galvanic corrosion remain unresolved,, thus blocking its potential application in metal protection. In this work, a bio-inspried multilayered graphene–epoxy composite coating was fabricated through a scalable spraying approach with well-dispersed low-defect engineered graphene as the functional filler. Polydopamine served as an enforcer to improve the dispersity and repair the structure defects of graphene (π–π interaction) and bridged the dense graphene layers and epoxy layers (strong adhesion) for forming “interlock” structures to ensure complete coating systems. Electrochemical tests confirmed that the bio-inspired composite coating showed elevated coating resistance from 4.2 × 106 Ω cm2 for blank coating and 2.5 × 108 Ω cm2 for blending composite coating to 3.0 × 109 Ω cm2. The highly anisotropic graphene layers endowed the bio-inspried coating with highly anisotropic thermal and electrical conductivities, with the in-plane and through-plane thermal conductivities being 0.78 and 0.21 W/mK, respectively. Besides, the good anisotropic conductivities make the bio-inspired coating achieve self-monitoring of structural safety and health. This bio-inspired strategy provides a fascinating method for constructing high-performance graphene composite coatings with functional properties.

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“…Probably, the presence of nanoparticles on the surface, may increase the surface energy, and lower the surface tension of water droplet at the coating surface‐water interface. Overall, the possible increase in surface energy and dielectric values may restrict the expected growth of contact angle values [35,44–46] . However, the contact angle values are in a good range, which can substantially repel the water molecules.…”

Section: Dispersion and Morphological Studiesmentioning

confidence: 99%

Mn(II)‐ and Zn(II)‐ Based Nanocomposites Metallopolymer for Corrosion Protective Coatings

et al. 2023

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The transition from conventional polymeric material to green and sustainable, environment-friendly biomaterials has been actively explored. The objective of the work involves the formulation of an oleo-polymer (corn oil, CO), hybridization with metallic ions (Zn 2 + and Mn 2 + ) through coordination bonding, study of the impact of fully/half-filled d-orbitals, and development of eco-friendly polymeric coating material. The formation of the nanoclusters (10-20 nm) within the polymeric matrix was estimated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Fourier transform infrared (FTIR) analysis supports the predicted chemical mech-anism involved during poly-urethanation of the metal-containing CO fatty amides. Interestingly, opposite to our expectations the metal ions with fully filled d-orbital (Zn 2 + ) showed relatively (Mn 2 + ) better thermal and anti-corrosion properties. The good adhesive strength of metallopolymers and the impact of the dorbital electrons on the corrosion protective performance, which was by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP). These nanocomposite coatings could be a suitable alternatives to petrochemicalbased polymers.

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Development of active barrier effect of hybrid chitosan/silica composite epoxy-based coating on mild steel surface

Cited by 20 publications

References 91 publications

Encapsulated Corrosion Inhibitive Pigment for Smart Epoxy Coating Development: An Investigation of Leaching Behavior of Inhibitive Ions

Encapsulated Corrosion Inhibitive Pigment for Smart Epoxy Coating Development: An Investigation of Leaching Behavior of Inhibitive Ions

Bio-inspired Multifunctional Graphene–Epoxy Anticorrosion Coatings by Low-Defect Engineered Graphene

Mn(II)‐ and Zn(II)‐ Based Nanocomposites Metallopolymer for Corrosion Protective Coatings

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