Electrochemical impedance spectroscopy response of water uptake in organic coatings by finite element methods

Stafford, O.A.; Hinderliter, Brian; Croll, Stuart

doi:10.1016/j.electacta.2006.07.047

Cited by 64 publications

(29 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This may be explained by prior FEA results which showed that as the aspect ratio of the water inclusions increased, the capacitive response was higher than similar water volume fractions in spherical inclusions. 18 The higher aspect ratio water inclusions produce a higher estimated water fraction by EIS capacitance measurements by up to a factor of 2 for water volume fractions of 3%, so simple application of Brasher and Kingsbury can easily overestimate the true water content.…”

Section: Resultsmentioning

confidence: 99%

“…FEA is one technique for solving Maxwell's equations of electromagnetism, and thus simulating EIS. In Stafford,18 FEA was used to investigate the change in the simulated EIS response as a function of the distribution of water inclusion within a polymer. The impedance and phase of the transmitted electromagnetic wave changed as a fixed amount of water was redistributed from spherical inclusions to cylindrical water inclusions of various aspect ratios.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Water sorption and diffusional properties of a cured epoxy resin measured using alternating ionic liquids/aqueous electrolytes in electrochemical impedance spectroscopy

et al. 2008

View full text Add to dashboard Cite

The protective quality of a coating is often measured by how long it delays the arrival of water to the substrate. The transport of water in, redistribution within, and eventually through a coating to the substrate has long been investigated through electrochemical impedance spectroscopy (EIS). EIS measurements employing alternating nonaqueous (room temperature ionic liquids, RTIL) and aqueous electrolytes elucidated the behavior of water within the coating. Diffusion coefficients could be measured and the redistribution of water into percolating paths identified. The use of RTIL alternating with aqueous electrolytes allows determination of intrinsic properties (water volume fraction at saturation and relative dielectric) and kinetic properties predicted by the Brasher Kingsbury formulation. This article focuses on the sensitivity of these intrinsic and kinetic properties to test duration in an unique experimental method.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Water sorption and diffusional properties of a cured epoxy resin measured using alternating ionic liquids/aqueous electrolytes in electrochemical impedance spectroscopy

et al. 2008

View full text Add to dashboard Cite

show abstract

“…The permittivity profiles computed according to Eq. (10), (12) and (14) are also significantly smoother than that calculated according to Eq. (3).…”

Section: Theorymentioning

confidence: 90%

“…However, those authors did not propose any specific resistivity or permittivity profiles. Inhomogeneities in the coating properties have been considered by Hinderliter et al [11,12] who related these inhomogeneities with electrolyte uptake in the coating and, taking into account various geometries for the electrolyte-filled coating defects, developed physical models of substrate/coating/electrolyte systems. Roche et al [13,14] observed the formation of an interphase region, next to the substrate/coating interface, with properties significantly different from those of the bulk coating material.…”

Section: Introductionmentioning

confidence: 99%

Constant-phase-element behavior caused by inhomogeneous water uptake in anti-corrosion coatings

Amand

Musiani

Orazem

et al. 2013

Electrochimica Acta

136

View full text Add to dashboard Cite

The impedance of a substrate/coating/electrolyte system was calculated with the assumptions: (i) the coating uptakes electrolyte to an extent that progressively decreases from the coating/electrolyte interface to the substrate/coating interface where it becomes negligible; (ii) the volume fraction of the electrolyte varies along the coating thickness according to a power-law; (iii) the resistivity and permittivity profiles of the electrolyte-penetrated coating can be calculated through an effective medium theory (EMT) formula corresponding to a parallel combination of the two media (electrolyte and coating material); and (iv) some pores extend from the coating/electrolyte interface to the substrate/coating interface, providing a low resistance path. The impedance plots thus calculated exhibited a constant phase element (CPE) behavior in a large frequency range. Some experimental results obtained with 2024 aluminum alloy/hybrid sol-gel coating samples immersed in a NaCl solution were analyzed with reference to the above described model.The extension of the recently-developed power-law CPE model to anti-corrosion coatings is shown to yield insight into the distribution of resistivity and associated water uptake. Evaluation of mixing rules for conductivities and permittivities of the two media (coating and electrolyte) showed that the linear combination provided results that were consistent with the observed impedance response; whereas, distributions resulting from a series combination of the two media, an EMT formula proposed in the literature, and the Maxwell approximation were incompatible with the observed CPE impedance response.

show abstract

“…More comprehensive treatments of the conductive and charge displacement behavior of such material systems can be obtained from approximate discrete element solutions of such materials, using for example commercial codes such as COMSOL and others. [11][12][13] However, most often these representations are based on continuity equations (e.g., Maxwell-Boltzman, etc.) and are not complete solutions for the local fields, rendering them useless for specific discussions of local effects such as surface charge.…”

Section: Approximate Methods Based On Physical Heuristicsmentioning

confidence: 99%

Relationship of Micromophology to Charge Storage and Transfer Properties in Heterogeneous Functional Materials

Reifsnider¹,

Liu²,

Adkins³

et al. 2014

Proceedings of 10th World Congress on Computational Mechanics

View full text Add to dashboard Cite

show abstract

Electrochemical impedance spectroscopy response of water uptake in organic coatings by finite element methods

Cited by 64 publications

References 18 publications

Water sorption and diffusional properties of a cured epoxy resin measured using alternating ionic liquids/aqueous electrolytes in electrochemical impedance spectroscopy

Water sorption and diffusional properties of a cured epoxy resin measured using alternating ionic liquids/aqueous electrolytes in electrochemical impedance spectroscopy

Constant-phase-element behavior caused by inhomogeneous water uptake in anti-corrosion coatings

Relationship of Micromophology to Charge Storage and Transfer Properties in Heterogeneous Functional Materials

Contact Info

Product

Resources

About