Method for Coating Metallic Surfaces with an Aqueous Composition and Said Composition

Abstract

The invention relates to a process for coating metallic surfaces with a composition containing silane/silanol/ siloxane/polysiloxane, the composition consisting essentially of a) at least one compound selected from silanes, silanols, siloxanes and polysiloxanes, b) at least two compounds selected from compounds containing titanium, hafnium, zirconium, aluminium and/or boron, and optionally c) at least one type of cation selected from cations of metals of subgroups 1 to 3 and 5 to 8, including lanthanides, and of main group 2 of the periodic table of the elements, and/or at least one corresponding compound, d) at least one organic compound selected from monomers, oligomers, polymers, copolymers and block copolymers, and/or e) at least one substance that influences the pH, as well as f) water, and g) optionally at least one organic solvent. The invention further relates to corresponding aqueous compositions.

1 - 23 . (canceled) 
   
   
       24 . A process comprising coating a metallic surface with a composition comprising
 a) at least one compound selected from a silane, a silanol, a siloxane and a polysiloxane, and   b) at least two compounds selected from titanium, hafnium, zirconium, aluminum or boron; and   water, and   optionally c) at least one type of cation selected from cations of metals of subgroups 1 to 3 and 5 to 8, including lanthanides, and of main group 2 of the periodic table of the elements, and/or at least one corresponding compound,   optionally d) at least one organic compound selected from monomers, oligomers, polymers, copolymers and block copolymers,   optionally e) at least one substance that influences the pH, and optionally f) at least one organic solvent.   
   
   
       25 . The process according to  claim 25 , wherein the pH of the composition is greater than 1.5 and less than 9. 
   
   
       26 . The process according to  claim 24 , wherein the composition has a content of compound a) ranging from 0.005 to 80 g/l, calculated on the basis of the corresponding silanols. 
   
   
       27 . The process according to  claim 24 , wherein compound a) contains at least one of an amino group, an urea group or an ureido group. 
   
   
       28 . The process according to  claim 24 , wherein the composition has a content of at least one compound b), selected from compounds containing titanium, haffium, zirconium, aluminum and boron, ranging from 0.01 to 50 g/l, calculated as the sum of the corresponding metal. 
   
   
       29 . The process according to  claim 28 , wherein the composition contains at least one complex fluoride b) selected from complex fluoride of titanium, hafnium, zirconium, aluminum and boron. 
   
   
       30 . The process according to  claim 29 , wherein the composition contains at least one complex fluoride, the total content of complex fluoride ranging from 0.01 to 100 g/l, calculated as the sum of the corresponding metal complex fluorides calculated as MeF 6 . 
   
   
       31 . The process according to  claim 29 , wherein the composition contains at least two different complex fluorides. 
   
   
       32 . The process according to  claim 24 , wherein the composition contains at least one type of cation c) selected from a cation of cerium, chromium, iron, calcium, cobalt, copper, magnesium, manganese, molybdenum, nickel, niobium, tantalum, yttrium, zinc, tin or other lanthanide. 
   
   
       33 . The process according to  claim 24 , wherein the composition has a content of cations and corresponding compounds c) ranging from 0.01 to 20 g/l, calculated as the sum of the metals. 
   
   
       34 . The process according to  claim 24 , wherein the composition has a content of organic compounds d) ranging from 0.01 to 200 g/l, calculated as added solids. 
   
   
       35 . The process according to  claim 24 , wherein the composition contains at least one phosphorus-containing and oxygen-containing compound. 
   
   
       36 . The process according to  claim 24 , wherein the composition contains at least one type of anion selected from a carboxylate or at least one corresponding undissociated or partially dissociated compound. 
   
   
       37 . The process according to  claim 24 , wherein the composition contains at least one of a nitrate or a nitrite. 
   
   
       38 . The process according to  claim 24 , wherein the composition contains at least one type of cation selected from an alkali-metal ion or an ammonium ion. 
   
   
       39 . The process according to  claim 24 , wherein the composition has a content of free fluoride ranging from 0.001 to 3 g/l, calculated as F − . 
   
   
       40 . The process according to  claim 24 , wherein the composition contains at least one fluoride-containing compound or fluoride anion. 
   
   
       41 . The process according to  claim 24 , wherein a mix of different metallic materials is coated with the aqueous coating in the same bath. 
   
   
       42 . The process according to  claim 24 , wherein the composition forms a coating with a layer weight which, based only on the titanium or zirconium contents, ranges from 1 to 200 mg/m , calculated as titanium. 
   
   
       43 . The process according to  claim 24 , wherein the composition forms a coating with a layer weight which, based only on siloxanes/poly-siloxanes, ranges from 0.2 to 1000 mg/m 2 , calculated as the corresponding extensively condensed polysiloxane. 
   
   
       44 . The process according to  claim 24 , wherein the coating produced with an aqueous composition is then coated with at least one primer, lacquer or adhesive or with a lacquer-like organic composition. 
   
   
       45 . An aqueous composition for coating metallic surfaces, comprising water and
 a) at least one compound selected from a silane, a silanol, a siloxane and a polysiloxane, and   b) at least two compounds selected from compounds containing titanium, haftlium, zirconium, aluminium or boron, and optionally   c) at least one type of cation selected from cations of metals of subgroups 1 to 3 and 5 to 8, including lanthanides, and of main group 2 of the periodic table of the elements, or at least one corresponding compound,   d) at least one organic compound selected from monomers, oligomers, polymers, copolymers and block copolymers, or   e) at least one substance that influences the pH, and   f) optionally at least one organic solvent.   
   
   
       46 . The metallic substrate coated by the process according to  claim 24 .