METHOD OF APPLYING COATING ON METAL SURFACE BY TREATING WITH AQUEOUS COMPOSITION, AQUEOUS COMPOSITION AND USE OF COATED METAL SUBSTRATES Russian patent published in 2011 - IPC C23C22/05 C23C22/34 C23C22/36 

FIELD: chemistry.

SUBSTANCE: metal surface is treated with an aqueous composition containing a) at least one compound a), selected from silanes, silanols, siloxanes and polysiloxanes, where content of silane/silanol/siloxane/polysiloxane in the composition is between 0.005 and 80 g/l, based on the corresponding silanols, b) at least one compound b), containing titanium, hafnium, zirconium, aluminium and/or boron, from which at least one is a complex fluoride, where the composition contains the compound b) in amount of 0.1-5 g/l, based on the sum of the corresponding metals, c) at least one type of cations selected from cations of metals of subgroups 1-3 and 5-8, including lanthanides, as well as group II elements and/or at least one corresponding compound c), where content of cations and/or corresponding compounds c) in the composition is between 0.01 and 6 g/l, at least one substance d) selected from d₁) silicon-free compounds, having at least one amine group, one urea group and/or one ureide group, d₄) phosphorus-containing compounds, anions of at least one phosphate and/or anions of at east one phosphonate, and e) water, where the aqueous composition is free from organic polymers.

EFFECT: invention enables to obtain a coating with good adhesion strength with a metal surface and high corrosion resistance made from an aqueous composition which meets environmental requirements.

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