| Titre : |
Study of impedance model and water transport behavior of modified solvent-free epoxy anti-corrosion coating by EIS II |
| Type de document : |
texte imprimé |
| Auteurs : |
Rui Ding, Auteur ; Wei-wei Cong, Auteur ; Jian-ming Jiang, Auteur ; Tai-jiang Gui, Auteur |
| Année de publication : |
2016 |
| Article en page(s) : |
p. 981-997 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique.
L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1.
C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple.
Anticorrosion
Diffusion (physique)
Eau
Epoxydes
Equation cinétique
Métaux -- Revêtements protecteurs
Spectroscopie d'impédance électrochimique
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
This work studied the evolution of an impedance model of 60 μm modified solvent-free epoxy anti-corrosion coating on a Q235 steel surface in 3.5% NaCl solution using electrochemical impedance spectroscopy. The electrochemical process of the system was divided into five stages. During the early stage of immersion, water absorption occurred mainly at the coating, coating resistance decreased, and coating impedance deviated from purely capacitive characteristics. The corrosion reaction started after water permeated into the metal/coating interface. During the mid-immersion stage, the electrochemical reaction at the coating/metal interface was controlled by semi-infinite diffusion of corrosion products due to the barrier effect of the coating. The types of corrosion product diffusion gradually became finite layer diffusion and barrier layer diffusion with the clogging of coating pores. Logarithm of coating capacitance and the square root of time showed a linear relationship in the early immersion stage, which was a typical characteristic of Fick’s diffusion. Afterwards, increase in the coating capacitance slowed down, and a non-Fickian diffusion process occurred, which presented the two-stage absorption characteristics. Water diffusion coefficient in coating was calculated to be 2.95 × 10−10 cm2/s, while volume fraction and total water absorption at saturation of coating were 2.3% and 185 μg, respectively, indicating good water resistance and protective properties of the coating. The water kinetic equation in the coating which can reflect the whole Fick diffusion process of water and containing time and location variables was obtained via the Fick diffusion equation and three-dimensional images of water distribution in the coating were drawn by transforming the dynamic equation into programs. |
| Note de contenu : |
- EXPERIMENTAL METHODS AND MATERIALS : Experimental materials and preparation of specimens - EIS measurement
- RESULTS AND DISCUSSION : Evolution of impedance and equivalent circuit model (Initial water absorption - Occurrence of corrosion and impeded absorption - Warburg diffusion control - Finite layer diffusion control - Barrier layer diffusion control) - Water transport behavior in coating (Coating capacitance and water uptake - Absorbing kinetic equation) |
| DOI : |
10.1007/s11998-016-9810-8 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-016-9810-8.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27245 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 6 (11/2016) . - p. 981-997
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