C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/62 (2006.01) C09D 5/08 (2006.01) C23C 22/50 (2006.01) C23C 22/53 (2006.01) C23C 22/60 (2006.01) C23C 22/68 (2006.01) C23C 22/74 (2006.01) C23C 22/83 (2006.01)
Patent
CA 2517057
The invention relates to a method for coating a metallic surface with an aqueous composition for pretreating before applying another coating or for treating said metallic surface. In addition to water, the composition contains: a) at least one hydrolyzable or at least partially hydrolyzed silane; b) at least one metal chelate, if necessary, also; c) at least one organic film former; d) at least one long-chain alcohol that serves as a film forming aid and/or; e) at least one inorganic compound in particle form. The unsoiled, scoured, cleaned and/or pretreated metallic surface is brought into contact with the aqueous composition and a film is formed on the metallic surface, is subsequently dried, compacted in part or completely by film formation and, if necessary, additionally hardened. The dried and, if necessary, additionally hardened film has a layer thickness ranging from 0.01 to 10 ~m. The invention also relates to corresponding aqueous compositions.
L'invention concerne un procédé de revêtement d'une surface métallique au moyen d'une composition aqueuse destinée au traitement préalable avant revêtement ultérieur, ou au traitement. Ladite composition contient, en plus de l'eau, a) au moins un silane hydrolysable ou au moins partiellement hydrolysé ; b) au moins un chélate de métal ; c) au moins un agent filmogène organique ; d) au moins un alcool à chaîne longue servant d'auxiliaire filmogène ; et/ou, e) au moins un composé anorganique sous forme particulaire. Selon ledit procédé, la surface métallique propre, décapée, lavée et/ou prétraitée est mise en contact avec la composition aqueuse, et un film est formé sur la surface métallique, séché, condensé par pelliculage partiel ou intégral, et éventuellement durci, ledit film séché et éventuellement durci présentant une épaisseur de couche de 0,01 à 10 ?m. L'invention concerne également des compositions aqueuses correspondantes.
Domes Heribert
Schneider Julia
Chemetall Gmbh
Robic
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