C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 5/08 (2006.01) B01F 17/00 (2006.01) B05D 7/14 (2006.01)
Patent
CA 2760745
The present invention relates to an acidic, aqueous, particulate composition comprising, in addition to iron(III) ions, fluoride ions and at least one water-insoluble, dispersed, organic binder, a water-insoluble, dispersed, oxidic pigment possessing high stability with respect to agglomeration, for the autophoretic deposition of organic-inorganic hybrid layers on metal surfaces, the composition further comprising at least one anionic wetting agent which has functional groups selected from sulphonates, phosphonates and/or carboxylates. The invention further encompasses the use of such a composition for the self-deposition of a film-forming organic-inorganic hybrid coating on metal surfaces selected at least in part from surfaces whose primary constituents are iron, zinc and/or aluminium.
La présente invention porte sur une composition particulaire aqueuse acide contenant, en dehors des ions fer (III), des ions fluorure et au moins un liant organique dispersé insoluble dans l'eau, un pigment oxydé dispersé insoluble dans l'eau, avec une stabilité élevée vis-à-vis de l'agglomération pour le dépôt autophorétique de couches hybrides organiques-inorganiques sur des surfaces métalliques, la composition contenant en outre au moins un agent mouillant anionique, qui présente des groupes fonctionnels choisis parmi sulfonate, phosphonate et/ou carboxylate. L'invention porte en outre sur l'utilisation d'une telle composition pour l'auto-dépôt d'un revêtement hybride organique-inorganique filmogène sur des surfaces métalliques qui sont au moins partiellement choisies parmi des surfaces dont les composants principaux sont le fer, le zinc et/ou l'aluminium.
Herrmann Ute
Schmidt-Freytag Ulrike
Henkel Ag & Co. Kgaa
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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