Method for coating metallic surfaces with an aqueous...

C - Chemistry – Metallurgy – 23 – C

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Details

C23C 22/36 (2006.01) C09D 5/12 (2006.01) C23C 22/34 (2006.01) C23C 22/68 (2006.01)

Patent

CA 2586673

The invention relates to a method for coating metallic surfaces with a silane/silanol/siloxane/polysiloxane-containing mixture, whereby the composition comprises a) at least one compound selected from silanes, silanols, siloxanes and polysiloxanes, b) at least one titanium-, hafnium-, zirconium-, aluminium- or/and boron-containing compound, c) at least one type of cation selected from cations of metals of the 1st to 3rd and 5th to 8th sub- groups, including lanthanides and the second main group of the periodic table of the elements, or/and at least one corresponding compound, a substance d), selected from d1) silicon-free compounds with at least one amino, urea or/and ureido group, d2) nitrite anions or/and compounds with at least one nitro group, d3) compounds based on peroxide, d4) phosphorus-containing compounds, anions of at least one phosphate or/and anions of at least one phosphonate and e) water and f) optionally at least one organic solvent. The invention further relates to corresponding aqueous compositions.

L'invention concerne un procédé pour recouvrir des surfaces métalliques au moyen d'une composition contenant les composés silane/silanol/siloxane/polysiloxane. Selon l'invention, cette composition comprend non seulement : a) au moins un composé sélectionné parmi des silanes, des silanols, des siloxanes, et des polysiloxanes ; b) au moins un composé contenant du titane, de l'hafnium, du zirconium, de l'aluminium et/ou du bore ; c) au moins un type de cations sélectionné parmi des cations de métaux issus du premier au troisième, et du cinquième au huitième groupe secondaire et des lanthanides, ainsi que du deuxième groupe principal de la classification périodique des éléments, et/ou au moins un composé correspondant, mais aussi ; d) au moins une substance qui est sélectionnée entre : d1) des composés exempts de silicium comportant respectivement au moins un groupe amino, urée, et/ou uréido ; d2) des anions de nitrite et/ou des composés comportant au moins un groupe nitro ; d3) des composés à base de peroxyde, et ; d4) des composés contenant du phosphore, des anions d'au moins un phosphate, ou/et des anions d'au moins un phosphonate, ainsi que ; e) de l'eau, et ; f) éventuellement au moins un solvant organique. La présente invention se rapporte en outre à des compositions aqueuses correspondantes.

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