Determination of water uptake in organic coatings deposited on 2024 aluminium alloy: Comparison between impedance measurements and gravimetry

Nguyen, Anh; Caussé, Nicolas; Musiani, Marco; Orazem, Mark E.; Pébère, Nadine; Tribollet, Bernard; Vivier, Vincent

doi:10.1016/j.porgcoat.2017.07.004

Cited by 63 publications

(40 citation statements)

References 40 publications

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“…In the case of a 3D dielectric layer on a conducting electrode surface, the CPE parameters can be directly related to the physical properties of the layer. For oxide films or organic coatings, the capacitance of the layers can be extracted from the impedance data by using the complex-capacitance representation [23e25, 34,37].…”

Section: Graphical Methodsmentioning

confidence: 99%

“…The impedance results for the ODA treated sample were analysed in two successive steps in order to determine the organic film thickness. The first approach was based on graphical methods, independent of any physical model [23,33,34]. The second approach was focused on the use of the power-law resistivity model developed by Hirschorn et al [35,36].…”

Section: Impedance Diagrams Analysismentioning

confidence: 99%

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Impedance analysis of film-forming amines for the corrosion protection of a carbon steel

Baux

Caussé

Esvan

et al. 2018

Electrochimica Acta

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Octadecylamine (ODA) is a well-known organic inhibitor for the corrosion protection of carbon steels. In the present study, electrochemical impedance data analysis was performed to extract physical parameters of the ODA thin film that formed on a P275 carbon steel surface. First, surface observations and contact angle measurements showed the steel surface modification after the ODA treatment linked to the adsorption of an organic hydrophobic thin film. X-ray photoelectron spectroscopy confirmed the presence of a very thin organic layer and revealed the presence of iron oxide/hydroxide underlying the ODA film. The impedance data analysis with a power-law distribution of resistivity in the organic film allowed the permittivity and thickness to be extracted. Finally, from the impedance results with and without ODA, the instantaneous corrosion inhibition efficiency was determined.

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Section: Graphical Methodsmentioning

confidence: 99%

Section: Impedance Diagrams Analysismentioning

confidence: 99%

Impedance analysis of film-forming amines for the corrosion protection of a carbon steel

Baux

Caussé

Esvan

et al. 2018

Electrochimica Acta

Self Cite

View full text Add to dashboard Cite

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“…Nguyen et al [82] analyzed the influence of the expression form of permittivity compared with the gravimetric result, suggesting that the linear relationship (Equation (32)) may be more or less adequate for different systems, while unacceptable error occurred when using the Sykes formula (Equation (34)). This is mainly because Sykes overestimated the influence of polymers on the water diffusion.…”

Section: Individual or Clustered Watermentioning

confidence: 99%

A Comprehensive Review on Water Diffusion in Polymers Focusing on the Polymer–Metal Interface Combination

Yang

Xing

et al. 2020

Polymers

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Water diffusion in polymers is relevant to a broad range of physicochemical phenomena and technological processes. Although many fields contributed to rapid progress in the fundamental knowledge of water–polymer interactions, detailed understandings come mainly from interpreting numerous experiments. These studies showed that a remarkably rich variety of diffusion forms between water and even seemingly simple polymers. In this review, focusing on the gravimetric and capacitance method, we discuss contradictions and problems existing for water diffusion in polymers in detail from perspectives of experiments and models, focusing on the analysis of error derived from widely used methods, especially for the Brasher–Kingsbury equation. We also provide a perspective on outstanding problems, challenges, and open questions, including water clusters, relaxation, and electrochemical reactions at the metal/polymer interface, as well as expanding the theoretical prospective.

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“…The water uptake is often assessed by gravimetric measurements [2,3], made either on metal-supported coatings or on free-standing films [4], and/or by electrochemical impedance spectroscopy (EIS) [5][6][7][8][9][10]. Even if several papers have underlined disagreement between the water uptake values obtained from these two methods, they are still commonly used to compare the water uptake into organic coatings [11]. The water uptake generally leads to a plasticization effect of the polymeric network, which results in a decrease in the glass transition temperature (T g ) with increasing water content [12].…”

Section: Introductionmentioning

confidence: 99%

Correlation between the physical structure of a commercially formulated epoxy paint and its electrochemical impedance response

Roggero

Villareal

Caussé

et al. 2020

Progress in Organic Coatings

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In the present work, a commercial high solids epoxy-based paint used for the corrosion protection of steel was characterized by electrochemical impedance spectroscopy (EIS). The aim was to analyze the influence of water absorption on the physical structure of the paint, through the impedance data analysis. First, the water uptake was followed by gravimetric measurements on free-standing films as a function of the exposure time to a 0.5 M NaCl solution. Gravimetric measurements indicated a mass loss, linked to a release of a plasticizer from the formulation. This compound was dosed in the NaCl solution. The water volume fraction was also determined from the high-frequency part of the impedance diagrams, employing a linear rule of mixtures. The water fraction values obtained from the two methods were in acceptable agreement. The glass transition temperature (T g ) was determined by differential scanning calorimetry for the dry coating as well as for the coating after different immersion times in the NaCl solution. The use of the dielectric permittivity formalism allowed the mean relaxation times to be obtained from the impedance data analysis. The real part of the electrical conductivity was also considered. The variation of these parameters values as a function of the exposure time to the NaCl solution, was correlated with the T g variation. They accounted for plasticization at the beginning of immersion (water uptake) and antiplasticization for longer exposure times (plasticizer release). For the studied system, it was possible to extract parameters representative of the molecular mobility from the impedance spectra analysis and to link them to the modification of the coating's physical structure.

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Determination of water uptake in organic coatings deposited on 2024 aluminium alloy: Comparison between impedance measurements and gravimetry

Abstract: 2017-08-25T16:31:22

Cited by 63 publications

References 40 publications

Impedance analysis of film-forming amines for the corrosion protection of a carbon steel

Impedance analysis of film-forming amines for the corrosion protection of a carbon steel

A Comprehensive Review on Water Diffusion in Polymers Focusing on the Polymer–Metal Interface Combination

Correlation between the physical structure of a commercially formulated epoxy paint and its electrochemical impedance response

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