An improved accelerated weathering protocol to anticipate Florida exposure behavior of coatings / Mark Nichols in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 2 (03/2013)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 10, N° 2 (03/2013) . - p. 153-173 Titre : An improved accelerated weathering protocol to anticipate Florida exposure behavior of coatings Type de document : texte imprimé Auteurs : Mark Nichols, Auteur ; John Boisseau, Auteur ; Lynn Pattison, Auteur ; Don Campbell, Auteur ; Jeff Quill, Auteur ; Jacob Zhang, Auteur ; Don Smith, Auteur ; Karen Henderson, Auteur ; Jill Seebergh, Auteur ; Douglas Berry, Auteur ; Tony Misovski, Auteur ; Cindy Peters, Auteur Année de publication : 2013 Article en page(s) : p. 153-173 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Revêtements:Automobiles -- Peinture Avions -- Revêtements:Avions -- Peinture Durée de vie (Ingénierie) Essais accélérés (technologie) Revêtements -- Détérioration Vieillissement Index. décimale : 667.9 Revêtements et enduits Résumé : A new accelerated weathering protocol has been developed which closely replicates the performance of automotive and aerospace coating systems exposed in South Florida. IR spectroscopy was used to verify that the chemical composition changes that occurred during accelerated weathering in devices with a glass filter that produced a high fidelity reproduction of sunlight’s UV spectrum matched those that occurred during natural weathering. Gravimetric water absorption measurements were used to tune the volume of water absorption during accelerated weathering to match that which occurred during natural weathering in South Florida. The frequency of water exposure was then scaled to the appropriate UV dose. A variety of coating systems were used to verify the correlation between the physical failures observed in the accelerated weathering protocol and natural weathering in South Florida. The new accelerated weathering protocol correctly reproduced gloss loss, delamination, cracking, blistering, and good performance in a variety of diverse coating systems. For automotive basecoat/clearcoat paint systems, the new weathering protocol shows significant acceleration over both Florida and previous accelerated weathering tests. For monocoat aerospace systems, the new weathering protocol showed less acceleration than for automotive coatings, but was still an improvement over previous accelerated tests and was faster than Florida exposure. Note de contenu : - EXPERIMENTAL : Materials - Natural weathering - Accelerated weathering - PAS-FTIR spectroscopy - Ultraviolet - Gloss and color change - Visual evaluation - Water sorption - RESULTS : Water absorption - Photochemistry - Physical failures of paint systems - Aerospace coatings - DISCUSSION : Water absorption - Spectral match to sunlight - Cyclic conditions - Acceleration of new tet protocol - Positive controls - UVA longevity - Aerospace coatings DOI : 10.1007/s11998-012-9467-x En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-012-9467-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18235 [article]

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Using beer's law to model / Don Campbell in COATINGS TECH, Vol. 7, N° 6 (06/2010)  

[article]  inCOATINGS TECH > Vol. 7, N° 6 (06/2010) . - p. 32-36 Titre : Using beer's law to model : Percent transmittance of multilayer composite coatings Type de document : texte imprimé Auteurs : Don Campbell, Auteur ; Antonette Saint-Pierre, Auteur Année de publication : 2010 Article en page(s) : p. 32-36 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Revêtements Lumière -- Absorption Photostabilité Primaire (revêtement) Revêtements -- Finition Revêtements multicouches Transmittance La transmittance, en général, est le rapport caractérisant la transmission d'une grandeur dans un système. Elle se calcule par le rapport entre la grandeur en entrée et en sortie. En optique, la transmittance d'un matériau ou d'un filtre est la fraction du flux lumineux le traversant. Elle est également nommée facteur de transmission mais aussi transparence dans le domaine de la photographie. Index. décimale : 667.9 Revêtements et enduits Résumé : Transmission of light through automotive topcoat and primer layers can lead to degradation of the underlying electrocoat layer and to topcoat delamination. To protect against this, it is critical that transmission of both ultraviolet wavelengths and certain visible wavelengths be effectively blocked by the topcoat and primer layers. The clearcoat, basecoat, and primer each have their own role and combine to protect against light transmission. The transmittance of these combined layers is typically measured by the Integrating Sphere UV-Visible Spectrophotometer. It would both simplify measurement of the topcoat systems and allow better system modeling if these layers could be measured separately and combined using Beer's Law to obtain the transmittance of the total topcoat system. Although some automotive pigments function by reflecting or scattering, we demonstrate here that log-linear models similar to Beer's Law for absorption can still be used to combine these layers and interpolate the effect of individual layer thickness on the total topcoat transmittance. En ligne : https://drive.google.com/file/d/1iQpcBcwSpPc1qLR_Q52vfyoc7zkABMwi/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40645 [article]

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