Study of impedance model and water transport behavior of modified solvent-free epoxy anticorrosion coating by EIS / Rui Ding in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 3 (05/2016) . - p. 501-515 Titre : Study of impedance model and water transport behavior of modified solvent-free epoxy anticorrosion coating by EIS Type de document : texte imprimé Auteurs : Rui Ding, Auteur ; Jianming Jiang, Auteur ; Taijiang Gui, Auteur Année de publication : 2016 Article en page(s) : p. 501-515 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. Epoxydes Equation cinétique Humidité -- Absorption:Eau -- Absorption Métaux -- Revêtements protecteurs Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : This paper studies the evolution of impedance model of 30 μm solvent-free epoxy coating on Q235 steel surface in 3.5% NaCl solution using electrochemical impedance spectroscopy. The electrochemical process of the system was divided into five stages. Water absorption occurred at the coating mainly during the early stage of immersion. In the meantime, coating resistance became smaller and coating impedance deviated from purely capacitive characteristics. After water permeated into the metal/coating interface, corrosion reaction began. During the middle stage of immersion, due to the barrier effect of the coating, the electrochemical reaction at the coating/metal interface was controlled by diffusion of corrosion products. Since the coating prepared was relatively thin, transport distance was short for water, which could easily reach the coating/metal interface. During the middle-late stage of immersion, coating peeled off from the metal surface, diffusion of water molecules gradually turned to a macroscopic infiltration process, and the coating lost its protective effect. A 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. Water diffusion coefficient in the coating was calculated to be 8.23 × 10−11 cm2/s, while volume fraction and total water absorption at saturation of coating were 3.5% and 105 μg/cm2, respectively, indicating good water resistance and protective properties of the coating. By solving the Fick’s diffusion equation, the kinetic equation which described the diffusion of water in the coating and included time and location variables were obtained. 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 - Water transport behavior in coating DOI : 10.1007/s11998-015-9769-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9769-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26290 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
18071	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 1 / 1)