Impedance analysis of the barrier effect of coil-coated materials: Water uptake and glass transition variations

Bonin, Pierre; Roggero, Aurélien; Caussé, Nicolas; Pébère, Nadine; Thierry, Dominique; Bozec, Nathalie Le

doi:10.1016/j.porgcoat.2021.106163

Cited by 14 publications

(22 citation statements)

References 60 publications

(94 reference statements)

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“…The quantity of water uptake in the coating can be evaluated using the Brasher Kingsbury relationship (eqn (S1), ESI†), despite being considered as possible overestimation. 51–54 Our results (Fig. S4, ESI†) show an average of 3% water uptake after 1 h of immersion for all coatings.…”

Section: Resultsmentioning

confidence: 83%

Molecular structure effects on the mechanisms of corrosion protection of model epoxy coatings on metals

Kotb¹,

Serfass²,

Cagnard³

et al. 2023

Mater. Chem. Front.

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Section: Resultsmentioning

confidence: 83%

Molecular structure effects on the mechanisms of corrosion protection of model epoxy coatings on metals

Kotb¹,

Serfass²,

Cagnard³

et al. 2023

Mater. Chem. Front.

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“…Bonin et al 29 presented another approach to determine water uptake by utilizing the fixed high frequency calculated capacitance from the impedance data and determining the coating permissivity

ε^{'} (f)

given in Equation (). This is achieved by substituting Equation () into Equation (), resulting in the following expression:

\begin{matrix} ε^{'} ((), f) goodbreak= \frac{- Z^{''}}{2 \cdot π \cdot f \cdot C_{v} \cdot {|Z|}^{2}} where constant C_{v} goodbreak= \frac{ε_{0} A}{l}, \end{matrix}

where,

Z^{''}

is the imaginary part of the impedance given at frequency

f

|Z|

is the impedance modulus.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…From the change in coating permittivity, the water uptake in the coating film is determined by applying a linear rule of mixture that considers the composition of the coating (including polymer matrix, fillers, and additives) and the absorbed water 29–31

\begin{matrix} ϕ ((), t) goodbreak= \frac{ε^{'} ((), t) - ε^{'} ((), 0)}{ε_{water} - ε^{'} ((), 0)} . \end{matrix}

ϕ (t)

is the volume fraction of water inside the coating film,

ε^{'} (t)

is the coating permittivity determined by EIS at time

t

ε^{'} (0)

is the initial coating permittivity, and

ε_{italicwater} = 80

is the water permittivity at 25°C.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Non‐destructive evaluations of water uptake in epoxy coating

Li,

Bi,

Weinell

et al. 2023

J of Applied Polymer Sci

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A commercial epoxy coating was studied on steel panels and as free films to investigate water uptake using non‐destructive techniques (gravimetric analysis, Electrochemical Impedance Spectroscopy [EIS], Attenuated Total Reflection‐Fourier Transform Infrared Spectroscopy [ATR‐FTIR], and Scanning Acoustic Microscopy [SAM]) after immersion in 3.5 wt% NaCl solution. In epoxy free films, water uptake showed rapid absorption initially, slowing down due to the counteracting process between water uptake and leachable content. Later, a mass decrease indicated leaching dominance. On coated steel, EIS revealed rapid water absorption within 72 h, followed by slower uptake up to 336 h. The continuous increase in water content resulted from observed coating layer swelling, confirmed by SAM. ATR‐FTIR analysis indicated hydrogen bonding of most absorbed water molecules to the epoxy matrix. By combining non‐destructive techniques, water uptake mechanisms into the epoxy coating film were proposed.

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“…In addition, modeling helps to identify and assign distinct time constants, mainly calculated from the phase diagram over time. In a recent study, a theoretical approach was used to understand the influence of water on the aging of a polyester/melamine/epoxy system's physical structure [104]. It was found that the time constant (τ) obtained from the impedance diagrams decreased due to the plasticizing effect of water on the polymer chains [104].…”

Section: Theoretical Approachesmentioning

confidence: 99%

Electrochemical Characterization of Polymeric Coatings for Corrosion Protection: A Review of Advances and Perspectives

et al. 2022

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The development of anti-corrosion polymeric coatings has grown exponentially in the fields of material science, chemistry, engineering, and nanotechnology during the last century and has prompted the evolution of efficient characterization techniques. Nowadays, polymeric coatings represent a well-established protection system that provides a barrier between a metallic substrate and the environment. However, the increase in complexity and functionality of these coatings requires high-precision techniques capable of predicting failures and providing smart protection. This review summarizes the state of the art for the main electrochemical techniques, emphasizing devices that track the anti-corrosion properties of polymeric coatings from the macroscale to the nanoscale. An overview of the advances in accelerated corrosion testing and the electrochemical characterization of coatings is explored, including insights into their advantages and limitations. In addition, the challenges and potential applications of the theoretical approaches are summarized based on current knowledge. Finally, this work provides the reader with the trends and challenges of designing future technologies and models capable of tracking corrosion and predicting failures.

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Impedance analysis of the barrier effect of coil-coated materials: Water uptake and glass transition variations

Cited by 14 publications

References 60 publications

Molecular structure effects on the mechanisms of corrosion protection of model epoxy coatings on metals

Molecular structure effects on the mechanisms of corrosion protection of model epoxy coatings on metals

Non‐destructive evaluations of water uptake in epoxy coating

Electrochemical Characterization of Polymeric Coatings for Corrosion Protection: A Review of Advances and Perspectives

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