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]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 3 (05/2016) . - p. 427-437 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 électrochimique Index. 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 resistance DOI : 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26284 [article]

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Advanced testing procedures for high performance coatings / Flavio Deflorian in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 908 (09/2000)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 908 (09/2000) . - p. 81-87 Titre : Advanced testing procedures for high performance coatings Type de document : texte imprimé Auteurs : Flavio Deflorian, Auteur ; Stefano Rossi, Auteur ; Pier Luigi Bonora, Auteur Année de publication : 2000 Article en page(s) : p. 81-87 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Peinture  anticorrosion  Industrie  automobile  Protection  corrosion  Essai  brouillard  salin  Impédance  électrique  Méthode  électrochimique  Etude  comparative  expérimentale  Spectrométrie  impédance Index. décimale : 667.9 Revêtements et enduits Résumé : In the first part of this work, an integrated approach incorporating electrochemical (electrochemical impedance spectroscopy), calorimetric (differential scanning calorimetry), mechanical (dynamic mechanical thermal analysis), and infrared spectroscopy (Fourier transform infrared spectroscopy) techniques was used to characterize some organic coatings from the automotive industry. Comparison of the results obtained with different techniques allows not only a higher precision in the evaluation of natural or artificial degradation, which is very difficult to obtain using traditional techniques, but also better data interpretation and, therefore, the possibility of understanding the different degradation mechanisms. In the second part, some preliminary results concerning the comparison of salt spray exposure and EIS measurements are discussed. The statistical analysis of the results showed that the degradation mechanism in the two cases is completely different and, therefore, the information which is obtained with the two testing approaches is also different. With EIS measurements obtained in immersion, it is possible to monitor, in particular, the barrier properties of the coatings, which are dominated by the presence of defects. In the case of salt spray (without scratch), the main property to be measured is the loss of adhesion which causes blister formation. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5790 [article]

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Artificial versus natural weathering tests / Flavio Deflorian in EUROPEAN COATINGS JOURNAL (ECJ), N° 10 (10/2012)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 10 (10/2012) . - p. 18-23 Titre : Artificial versus natural weathering tests : Making sense of the comparison Type de document : texte imprimé Auteurs : Flavio Deflorian, Auteur ; Michele Fedel, Auteur ; Stefano Rossi, Auteur Année de publication : 2012 Article en page(s) : p. 18-23 Note générale : Bibliogr. Langues : Anglais (eng) 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. Essais accélérés (technologie) Métaux -- Revêtements protecteurs Revêtements -- Détérioration Revêtements organiques Index. décimale : 667.9 Revêtements et enduits Résumé : Testing and measuring - The protective properties of organic coated galvanised steel for outdoor applications are generally evaluated by means of accelerted laboratory tests, including electro-chemical techniques. How can these accelerated tests be correlated with natural exposure in different environments ? Note de contenu : - Natural ageing - One year of ageing - Decrease in impedance Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16044 [article]

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Polymethyl (hydro)/polydimethylsilazane-derived coatings applied on AA1050: effect of the dilution in butyl acetate on the structural and electrochemical properties / Michele Fedel in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 4 (07/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 4 (07/2019) . - p. 1013-1019 Titre : Polymethyl (hydro)/polydimethylsilazane-derived coatings applied on AA1050: effect of the dilution in butyl acetate on the structural and electrochemical properties Type de document : texte imprimé Auteurs : Michele Fedel, Auteur ; Stefano Rossi, Auteur ; Flavio Deflorian, Auteur Année de publication : 2019 Article en page(s) : p. 1013-1019 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aluminium -- Alliages Couches minces Hydrophobie Oléophobie Polysilazanes Revêtements anti-graffitis Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : Polyorganosilazane (PSZ) has been used for many years as a ceramic precursor for the preparation of silicon carbonitrides. Recently, polymethyl (hydro)/polydimethylsilazane-derived coatings that can be cured with atmospheric moisture at low temperatures have attracted interest due to their hydrophobic nature and electrochemical properties. In this work, polymethyl (hydro)/polydimethylsilazane-derived coatings have been deposited on aluminum alloy AA1050. The effect of the PSZ precursor concentration (5–40 v/v%) on the final properties of the coatings has been investigated. Butyl acetate has been employed as solvent. The layers were applied on the substrate by dipping. The experimental results showed that the concentration of the PSZ in the solvent strongly affects the dry thickness of the hybrid layer. The electrochemical impedance spectroscopy measurements revealed that the coatings derived from PSZ precursor concentration higher than 20 v/v% are protective and homogenous. Contact angle measurements evidenced that the presence of the coatings increased the hydrophobicity of the substrate as well as the oleophobicity regardless of the dilution in the organic solvent. The graffiti resistance of the coatings has been demonstrated to be acceptable regardless of the dilution of the PSZ precursor, in the investigated range. DOI : 10.1007/s11998-018-00176-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-00176-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32857 [article]

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UV-cured coatings based on waterborne resins ans Si02 nanoparticles / Anna di Gianni in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 6, N° 2 (06/2009)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 6, N° 2 (06/2009) . - p. 177-185 Titre : UV-cured coatings based on waterborne resins ans Si02 nanoparticles Type de document : texte imprimé Auteurs : Anna di Gianni, Auteur ; Stefano Turri, Auteur ; Roberta Bongiovanni, Auteur ; Flavio Deflorian, Auteur ; Giulio Malucelli, Auteur ; Giancarlo Rizza, Auteur Année de publication : 2009 Article en page(s) : p. 177-185 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Corrosion Dioxyde de silicium Nanoparticules Photopolymères Polymérisation Revêtements -- Séchage sous rayonnement ultraviolet Revêtements en phase aqueuse:Peinture en phase aqueuse Sol-gel, Procédé Index. décimale : 667.9 Revêtements et enduits Résumé : The UV-curing technique in combination with the use of waterborne resins is very attractive since it gives the opportunity to get solid coatigs by means of ecofriendly processes. We found that it is possible to use such UV curable water-based formulations as matrices for the preparation of nanocomposites in which the filler is generated in situ by means of the sol-gel chemistry. We prepared silica-based nanocomposites and characterized ther comparing their performances with those of the silica-free coatings. Moreover, the article discusses the influence of the addition of a coupling agent between the organic and inorganic phase on the final properties of the nanocomposites. DOI : 10.1007/s11998-008-9137-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-008-9137-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5603 [article]

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