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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Characterization and testing of photoreactive pigments / Pier Luigi Bonora in DOUBLE LIAISON, N° 554 (12/2006)

[article]  inDOUBLE LIAISON > N° 554 (12/2006) . - p. 26-32 Titre : Characterization and testing of photoreactive pigments Type de document : texte imprimé Auteurs : Pier Luigi Bonora, Auteur ; Luigi Creazzi, Auteur ; Veronica Telch, Auteur Année de publication : 2006 Article en page(s) : p. 26-32 Note générale : Bibliogr. Langues : Français (fre) Catégories : Caractérisation Dioxyde de titane Photocatalyse Photochimie Photoréactivité Pigments à effets spéciaux Poudres Index. décimale : 667.2 Colorants et pigments Résumé : Nanoscaled materials characteristics differ from bulk materials and from micro sized powders. The higher surface area affect their chemical and physical properties, allowing the design of new materials with improved optical, thermal, mechanical, chemical, electrical performances. In the last years, the progress in the synthesis of nano-scaled materials promoted the use of nano-crystals in many different fields, for instance in optoelectronics, biomedical, energy conversion and photocatalysis. In particular, the production of photocatalytic coatings is a field of great interest, mainly because of the challenging possibilities in the environmental field given by the photodegradation of pollutant substances. On the basis of the former studies in the field of nanotechnology, dealing with metallic coatings with ceramic nano-reinforcements, this work has been conducted, in order to characterize and test the photocatalytic activity of several titanium dioxide nanopowders, compared to a common microsized powder. In this paper, the results of the characterization and the photocatalytic behaviour of the powders, and the dispersion of the powders in coatings matrixes are discussed. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3517 [article]

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