Accueil
Détail de l'auteur
Auteur S. Rossi |
Documents disponibles écrits par cet auteur
Ajouter le résultat dans votre panier Affiner la recherche
Accelerated weathering and chemical resistance of polyurethane powder coatings / S. Rossi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)
[article]
Titre : Accelerated weathering and chemical resistance of polyurethane powder coatings Type de document : texte imprimé Auteurs : S. Rossi, Auteur ; Michele Fedel, Auteur ; S. Petrolli, Auteur ; Flavio Deflorian, Auteur Année de publication : 2016 Article en page(s) : p. 427-437 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Essais accélérés (technologie)
Polyuréthanes
Résistance chimique
Revêtements -- Détérioration:Peinture -- Détérioration
Revêtements poudre:Peinture poudre
solvants
Spectroscopie d'impédance électrochimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : A study of the weathering mechanism of innovative polyurethane powder coatings has been performed. UV-B irradiation and condensation cycle accelerated tests were carried out on two different polyurethane powder coating formulations for outdoor applications. Using Fourier transform infrared spectroscopy and microscope observation, it was possible to analyze the photochemical and morphological modifications. In addition, the color and gloss changes were measured. Organic coatings are often in contact with solvents in particular during cleaning actions. The chemical resistance was then studied considering the evolution of the corrosion barrier property of the coating as a function of the solvent contact time. Electrochemical impedance spectroscopy measurements were carried out. Methylethylketone (polar) and xylene (apolar) were considered as representative solvents. Due to the strong polarity, the first solvent showed a strong interaction with the hydrogen bonds between the polyurethane chains causing the solvent uptake. The amount of solvent uptake depends on the coating chains rigidity caused by the different polyester resin monomers. The apolar xylene presented no significant interaction with the coatings. Note de contenu : - Sample characterization
- UV-B-condensation aging
- Solvent resistanceDOI : 10.1007/s11998-015-9764-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9764-2.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26284
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 3 (05/2016) . - p. 427-437[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 18071 - Périodique Bibliothèque principale Documentaires Disponible Influence of deposition parameters on the behavior of nitro-cobalt-based and Ti-hexafluoride-based pretreatments / A. Cristoforetti in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 3 (05/2022)
[article]
Titre : Influence of deposition parameters on the behavior of nitro-cobalt-based and Ti-hexafluoride-based pretreatments Type de document : texte imprimé Auteurs : A. Cristoforetti, Auteur ; M. Fedel, Auteur ; F. Deflorian, Auteur ; S. Rossi, Auteur Année de publication : 2022 Article en page(s) : p. 859-873 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.
Adhésion
Coil coatings
Essais accélérés (technologie)
Essais de brouillard salin
Galvanisation
Revêtement de conversion
Revêtements:Peinture
Spectroscopie d'impédance électrochimiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : Two different chemical pretreatments for hot-dip galvanized steel, typically used in the coil coating field, were considered comparing their electrochemical behavior (electrochemical impedance spectroscopy (EIS), potentiodynamic curves) after a morphological characterization of the deposited films. The wet and dry adhesion of the following deposited paint is tested employing neutral salt spray chamber test (NSST) and pull-off test. Despite these technologies being widely adopted in industrial plants, the literature lacks some relevant research about the actual improvement in durability, especially in the case of nitro-cobalt based conversion. This paper analyzes the factors affecting the protection provided by the deposited film and varying the principal production parameter, the immersion time in the chemical conversion solution, an optimization study was carried out. The better behavior of the titanium hexafluoride-based artificial conversions, with respect to the nitro-cobalt one, is highlighted. Such treatment analyzed as bare surface gives higher impedance modulus and lower corrosion current density compared to the second one. For both the technologies, the uselessness of longer treatment periods in terms of performance improvement is found. The results obtained from the electrochemical characterization are in accordance with the technological test on the painted samples, such as NSST, where the delamination rate is significantly higher for the substrate treated employing a nitro-cobalt-based bath. Note de contenu : - EXPERIMENTAL METHODS AND MATERIALS
- RESULTS AND DISCUSSION : Morphology and composition - Free corrosion potential trend - Impedance spectra - Potentiodynamic polarization curves - Neutral salt spray chamber test, adhesion of painted samples
- Table 1 : Sample's production parameters and corresponding code
- Table 2 : Comparison between surface and cluster composition by EDXS analysis on T-300 sample
- Table 3 : Numerical data obtained from electrochemical measurements carried out in aerated conditionsDOI : https://doi.org/10.1007/s11998-021-00563-0 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00563-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38081
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 3 (05/2022) . - p. 859-873[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 23605 - Périodique Bibliothèque principale Documentaires Disponible