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Degradation of epoxy coatings exposed to impingement flow / Amin Vedadi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
[article]
Titre : Degradation of epoxy coatings exposed to impingement flow Type de document : texte imprimé Auteurs : Amin Vedadi, Auteur ; Xinnan Wang, Auteur ; M. Subbir Parvej, Auteur ; Quan Yuan, Auteur ; Fardad Azarmi, Auteur ; Dante Battocchi, Auteur Année de publication : 2021 Article en page(s) : p. 1153-1164 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes
Flux d'impact
Microscopie à force atomique
Revêtements -- Détérioration
Revêtements organiques
Spectroscopie d'impédance électrochimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Organic coatings are widely used for the corrosion protection of metals. Despite a wide range of work on the degradation of organic coatings, few studies have contributed to understand the influence of the fluid flow on the degradation of organic coatings. In this study, an epoxy coating is exposed to a vertical impingement flow of a 3.5 wt% NaCl solution with a variety of flow rates. The coating degradation is monitored by electrochemical impedance spectroscopy (EIS). Equivalent circuit models are employed to interpret the EIS spectra. Atomic force microscopy (AFM) was employed to study the influence of fluid flow on the surface topology of the coating samples. We found that the coating’s barrier property deteriorates more drastically when exposed to higher flow rates for impingement flow. Coating thickness and surface roughness are significantly affected by the fluid shear and the flow rate. It is concluded that the impingement flow substantially impacts the barrier properties of epoxy coatings owing to its influence on the electrochemical properties of the coating layers and the fluid shear it creates on the coating surface. Note de contenu : - MATERIALS AND METHODS : Corrosion test chamber and fluid circulation system - Materials and sample preparation - Experimental setup
- RESULTS AND DISCUSSION : EIS results - Equivalent circuit modeling - Topography characterization
- Table 1 : Coating thickness, capacitance, and total amount of 3.5 wt% NaCl solution (Mt) in a coating sample at different flow ratesDOI : https://doi.org/10.1007/s11998-021-00472-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00472-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36221
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 4 (07/2021) . - p. 1153-1164[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22969 - Périodique Bibliothèque principale Documentaires Disponible Influence of impingement flows with sand particles on the barrier properties of organic coatings / Amin Vedadi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 4 (07/2023)
[article]
Titre : Influence of impingement flows with sand particles on the barrier properties of organic coatings Type de document : texte imprimé Auteurs : Amin Vedadi, Auteur ; Jordi Estevadeordal, Auteur ; Xinnan Wang, Auteur ; Jiajia Rao, Auteur ; Yechun Wang, Auteur Année de publication : 2023 Article en page(s) : p. 1235-1255 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Contraintes (mécanique)
Dynamique des fluides computationnelle
Eoliennes
Essais de résilience
Essais dynamiques
Flux d'impact
Particules (matières)
Revêtements organiques
Sable
Spectroscopie d'impédance électrochimique
Structures offshoreIndex. décimale : 667.9 Revêtements et enduits Résumé : The installations of offshore wind farms, especially the type with monopile structures, increase the number of suspended particles in the surrounding area. The offshore wind structures are usually coated with several layers of coatings, including a thin layer of organic coating as a topcoat. In this study, we aim to investigate the influence of the stresses on the organic coatings due to the kinetic energy of the suspended sand particles. To accomplish the goal, impingement flow jets with particles were applied on coated steel samples for a week in a lab-scale impingement chamber. The working fluid for the experiments was 3.5 wt% NaCl solution with 1 wt% suspended sand particles. Electrochemical impedance spectroscopy (EIS) was conducted to monitor the degradation of organic coatings while exposed to the impingement flow. Computational fluid dynamics (CFD) modeling was utilized to calculate the magnitude of the applied fluid stresses on the coatings. Thermodynamics of electrochemical reactions and the activation theories were utilized to compare with the electrochemical parameters. It was concluded that for the lowest flow rate (Q1 = 6.31 cm3/s), the added sand particles started to show destructive influence after the first three days of exposure. As the flow rate increased, the destructive influence of sand particles on coating samples appeared earlier at the beginning of the exposure, and the elements of equivalent circuit model showed larger difference between coatings exposed to pure NaCl solution and those exposed to solution with sand particles. For the highest flow rate (Q3 = 18.93 cm3/s), the destructive influence of sand particles was significant, indicating that for the particulate flows with the velocity of 1 m/s, which is the regular velocity of the underwater zone in shallow sea regions (with a depth of 30 m), the momentum impact of the sand particles plays a vital role in the degradation of the organic coatings. Note de contenu : - EXPERIMENTS :
- Samples and fluid preparation
- Electrochemical spectroscopy measurement and topography characterization
- Experimental set-up
- CFD modeling of the impingement flow in the chamber
- RESULTS AND DISCUSSION :
- Analysis of the applied fluid’s stresses and particle impacts based on CFD results
- EIS results of the particulate and non-particulate impingement flows and their respective equivalent circuit model
- Equivalent circuit modeling, and comparison between the circuit elements of the particulate and non-particulate flow
- Electrochemical parameters of the particulate and non-particulate flows
- Table 1 : The thickness and average coating capacitance before and after exposure to sand particulate and non-particulate 3.5 wt% NaCl solution at different flow rate, as well as the water uptake and volume fraction of water in the coatings after a week of exposureDOI : https://doi.org/10.1007/s11998-023-00739-2 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00739-2.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39713
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 4 (07/2023) . - p. 1235-1255[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24153 - Périodique Bibliothèque principale Documentaires Disponible