Review : Degradation of automotive clear coat caused by bird droppings / Balkrushna Dahatonde in PAINTINDIA, Vol. LXX, N° 11 (11/2020)  

[article]  inPAINTINDIA > Vol. LXX, N° 11 (11/2020) . - p. 78-90 Titre : Review : Degradation of automotive clear coat caused by bird droppings Type de document : texte imprimé Auteurs : Balkrushna Dahatonde, Auteur ; Manoj Kadam, Auteur ; Sachin Gupta, Auteur Année de publication : 2020 Article en page(s) : p. 78-90 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Automobiles -- Vernis Détérioration enzymatique Fientes d'oiseaux Hydrolyse Pancréatine Index. décimale : 667.9 Revêtements et enduits Résumé : This review paper aims at investigating the degradation mechanism of an automotive clear coat caused by bird droppings. Natural bird droppings and their synthetic equivalent (pancreatin) were utilized for this purpose. The presence of highly etched areas on the surface of coatings and structural variations of clear coat after being attacked by these materials corresponded to a catalyzed hydrolytic degradation. This finding was obtained using different analytical techniques. Based on these studies, three possible hypotheses were presented, including acid catalysis, metal ion catalysis, and enzymatic catalysis. The conditions required for the occurrence of each hypothesis were discussed. It was found that acid and metal ions have a weak contribution to catalyze the hydrolysis reaction of clear coat, whereas enzymes existing in bird droppings were mainly responsible for this hydrolytic degradation. Note de contenu : - EXPERIMENTAL : Coating preparation - Biological materials - Biological tests - CHARACTERIZATION - RESULTS AND DISCUSSION : Microscopic evaluations - Acid catalyzed hydrolysis - Catalysis by metal ions - Enzymatically-induced hydrolysis - Fig. 1 : Typical defect features of an automotive clear coat influenced by bird droppings and pancreatin - Fig. 2 : Specifications of a multilayer automotive system - Fig. 3 : Optical and AFM images of clear coat surface before and after exposure to various conditions - Fig. 4 : FTIR spectra of clear coat before and after exposure to various conditions : a) before any exposure, b) after 300 h exposure to pancreatin and weathering, c) after 300 h exposure to bird-dropping and weathering and d) after 300 h exposure to only weathering - Fig. 5 : EDS spectra of a) intact and degraded area caused by b) bird dropping, c) pancreatin - Fig. 6 : Shows the FTIR and XRF analyses of bird droppings and pancreatin - Fig. 7 : Degradation mechanism of a typical acrylic melamine caused by bird droppings or pancreatin - Fig. 8 : Optical and scanning electron microscopic images of damaged surface of clearcoat at different temperatures - Fig. 9 : SEM images and EDS analysis of different points of degraded areas - Table 1 : Specification of pancreatin - Table 2 : The EDS results of pancreatin before and after repeated rinsing by DI water En ligne : https://drive.google.com/file/d/1ZalLXfidGTI7IHqxJS1uncjmJeWjtHuX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35195 [article]

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