C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/78 (2006.01) B05D 7/16 (2006.01) C23C 22/60 (2006.01) C23C 22/83 (2006.01) B05D 7/00 (2006.01)
Patent
CA 2185163
Painted metal sheet pretreated with an insoluble, composite layer containing siloxane. The composite layer is formed by rinsing the sheet with an alkaline solution containing at least 0.005 M of a dissolved silicate or a dissolved aluminate, at least 0.1 vol.-% of an organofunctional silane and at least 0.02 vol.-% of a crosslinking agent having two or more trialkoxysilyl groups. After the sheet is dried, the composite layer has a thickness of at least 10 .ANG.. After being painted, the siloxane forms a tenacious covalent bond between the paint and the metal substrate.
On prétraite une tôle métallique à l'aide d'une couche d'apprêt composite et insoluble, contenant du siloxane, avant d'appliquer la peinture. On forme la couche composite en rinçant la tôle avec une solution alcaline contenant au moins 0.005 M d'un silicate ou d'un aluminate dissous, au moins 0.1 % en volume d'un silane organofonctionnel et au moins 0.02 % en volume d'un agent de réticulation ayant deux groupes trialcoxysilyle ou davantage. Une fois la plaque sèche, la couche composite a une épaisseur d'au moins 10 ANGSTROM . Après l'application de la peinture, le siloxane forme des liaisons covalentes particulièrement solides entre la peinture et le substrat métallique.
Ooij Wim J. Van
Sabata Ashok
Borden Ladner Gervais Llp
University Of Cincinnati
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