Bake oven induced variation of surface chemistry on electrocoat paint / Larry P. Haack in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 903 (04/2000)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 903 (04/2000) . - p. 63-70 Titre : Bake oven induced variation of surface chemistry on electrocoat paint : Effect on primer-electrocoat intercoat adhesion Type de document : texte imprimé Auteurs : Larry P. Haack, Auteur ; Joseph W. Holubka, Auteur Année de publication : 2000 Article en page(s) : p. 63-70 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Peinture  Multicouche  Durcissement  Cuisson  au  four  Propriété  surface  Adhérence  Interface  Dépôt  électrophorèse  Etude  expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : The interplay of bake oven processing environment and surface/interfacial chemistry, and their effect on intercoat adhesion has been investigated for a model primer/electrocoat paint system. X-ray photoelectron spectroscopy (XPS) surface analysis established that a prominent ether component in the C is core level spectrum correlated with a polyether-based crater-control additive in the electrocoat that surface-segregates during cure. Laboratory-simulated bake oven experiments confirmed that better adhesion characteristics were realized by removal of this electrocoat overlayer through reaction with nitrogen oxides and high levels of moisture present in the cure environment of production direct-fired ovens. Details of the effect of bake oven atmosphere on cure chemistry for direct-fired versus indirect-fired ovens are presented. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5817 [article]

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Influence of coating formulation variables and processing on the adhesion of melamine - crosslinked polyester primer to urethane - crosslinked epoxy electrocoat / Larry P. Haack in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 905 (06/2000)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 905 (06/2000) . - p. 61-65 Titre : Influence of coating formulation variables and processing on the adhesion of melamine - crosslinked polyester primer to urethane - crosslinked epoxy electrocoat Type de document : texte imprimé Auteurs : Larry P. Haack, Auteur ; Joseph W. Holubka, Auteur Année de publication : 2000 Article en page(s) : p. 61-65 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : The role of spray-primer formulation chemistry towards robustness of adhesion to an epoxy-based electrocoat was examined for a range of coatings representative of those used in automotive OEM applications. For coatings exhibiting degraded adhesion performance, high-resolution X-ray photoelectron spectroscopy (XPS) identified the presence of a surface-active polyether-based anti-cratering agent (ACA) formulated into the epoxy-based electrocoat at the primer/electrocoat interface. The adhesion performance of the better-performing systems was found to be related to the spray-primer’s ability to accommodate the ACA by either absorbing or displacing it from the electrocoat surface, thus diluting it to concentrations no longer adversely affecting adhesion. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5802 [article]

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