Unified equivalent circuit of dielectric permittivity and porous coating formalisms for EIS probing of thick industrial grade coatings

Martinez, Sanja; Šoić, Ivana; Špada, Vedrana

doi:10.1016/j.porgcoat.2021.106155

Cited by 8 publications

(7 citation statements)

References 36 publications

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“…The impedance results of the analyzed powder coatings before and after the corrosion tests are shown in Table 8 . Values of the logarithm of impedance at 0.1 Hz below 6 indicate low barrier properties of the anti-corrosion system [ 54 ]. The presented measurement results clearly confirm the degrading effect of humidity at 1000 h on the polyester coating.…”

Section: Resultsmentioning

confidence: 99%

Accelerated Corrosion Tests in Quality Labels for Powder Coatings on Galvanized Steel—Comparison of Requirements and Experimental Evaluation

2021

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Powder coatings are widely applied for corrosion protection of steel, aluminum, and hot dip galvanized steel in a variety of corrosive environments. Powder coatings are subjected to a number of strict laboratory tests to determine their mechanical properties, corrosion resistance, and color stability. Among European quality certificates for powder coatings applied to galvanized steel, the most commonly recognized are GSB-ST and Qualisteelcoat certificates, which also refer to the EN 13438 standard. Certificates of quality for powder coatings are constantly updated according to the latest research results and experience of specialists operating in the field of corrosion protection. This paper presents an experimental evaluation of how the required length of selected accelerated corrosion tests can affect the final assessment of powder coatings. On the example of two powder painting systems: polyester as well as based on epoxy and polyester resins, the paper presents the influence of the time of accelerated corrosion tests: ISO 6270, ISO 9227 (Neutral Salt Spray and Acetic Acid Salt Spray), and ISO 3231 on the protective properties of the coatings. The results of damage assessment according to ISO 4628 have been correlated with the requirements of particular quality specifications. Additionally, based on FTIR (Fourier Transform Infrared Spectroscopy) and EIS (Electrochemical Impedance Spectroscopy) analyses, the influence of the applied corrosion tests on the degradation degree of the coatings studied has been presented. The paper aims to present a tests for those powder coating systems applied to facilities for which the main requirement is corrosion resistance rather than aesthetics.

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Section: Resultsmentioning

confidence: 99%

Accelerated Corrosion Tests in Quality Labels for Powder Coatings on Galvanized Steel—Comparison of Requirements and Experimental Evaluation

2021

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“…Moisture absorbed by the coating could also accelerate the nanofibre shell material (PVA) dissolution. [ 47–59 ] Thus, GACE from the cut‐off nanofibres showed an accelerated dissolution in the NaCl solution. Iron ions reacted with GACE immediately and formed a chelation film.…”

Section: Resultsmentioning

confidence: 99%

“…With an increase in the immersion test duration, the moisture content of the coating and chelation film and the ion diffusion rate increased. After the water absorption, the coating expanded and swelled, which led to the development of ionic paths within the coating [ 47–59 ] and, subsequently, to weakened barrier properties of the coating. [ 41 ] This resulted in the decreased coating and film resistance, R t .…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterisation of an iron‐ion‐responsive coating with core–shell electrospun fibres containing a chelation agent

Song

Shi

Han³

et al. 2021

Materials & Corrosion

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A self‐healing coating containing an electrospun nanofibre encapsulating 3,4,5‐trihydroxy benzoic acid cyclohexyl ester (GACE) was prepared. Scanning electron microscopy and transmission electron microscopy demonstrated that the nanofibre had a core–shell structure. The shell thickness of the electrospun fibre was approximately 270 nm, while the core thickness was approximately 380 nm. The self‐healing process of the coating containing GACE nanofibres over a carbon steel surface was simulated in a 3.5 wt% NaCl solution for 30 days. Fourier‐transform infrared spectroscopy analysis revealed that the synthesised GACE reacted with iron ions and formed a stable Fe–O–C compound, which could repair the scratched coating. The self‐repair performance was evaluated through electrochemical measurements, and then a healing model was developed.

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“…As a result, data acquisition is no longer the time-consuming aspect of the process; rather, the analysis of experimental data has become the primary bottleneck. Therefore, impedance modeling plays a crucial role in the EIS method [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Electrical Equivalent Circuit Model Prediction of High-Entropy Alloy Behavior in Aggressive Media

Cabrera-Peña

Brito-Garcia

Rosca

et al. 2023

Metals

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Due to the optimistic outcomes of the research on high-entropy alloys, new designs of these alloys are being encouraged. We studied the high-entropy CoCrFeMoNi alloy and the CoCrFeMoNi alloy doped with Zr. In order to choose the best electrical equivalent circuit for the prediction of the behavior of these high-entropy alloys at various potentials in artificial seawater, electrochemical impedance spectroscopy (EIS) measurements were conducted on samples with and without Zr-doped CoCrFeMoNi. At various potential levels, the impedance spectra were measured between −1.0 and +0.8 V vs. SCE. The study consists of a preliminary section with microstructure by metallography, open-circuit potential, and linear polarization curves by direct-current tests followed by visual analysis of the impedance spectra, and, finally, the selection of an equivalent electrical circuit model to fit the experimental data. By leveraging the advantages of EIS analysis, the information is essential for materials development, corrosion-mitigation strategies, and the successful implementation of these alloys in practical applications. It is important to note that selecting an equivalent circuit is often an iterative and subjective process, as it involves a balance between model complexity and the ability to accurately represent the system’s behavior.

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Unified equivalent circuit of dielectric permittivity and porous coating formalisms for EIS probing of thick industrial grade coatings

Cited by 8 publications

References 36 publications

Accelerated Corrosion Tests in Quality Labels for Powder Coatings on Galvanized Steel—Comparison of Requirements and Experimental Evaluation

Accelerated Corrosion Tests in Quality Labels for Powder Coatings on Galvanized Steel—Comparison of Requirements and Experimental Evaluation

Synthesis and characterisation of an iron‐ion‐responsive coating with core–shell electrospun fibres containing a chelation agent

Electrical Equivalent Circuit Model Prediction of High-Entropy Alloy Behavior in Aggressive Media

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