Silane Containing Coatings

Abstract

Disclosed are corrosion resistant compositions and processes for the preparation thereof that involve the application of a plurality of layers comprised of at least one tetraalkoxysilane and at least one functionalized silane layer to a supporting substrate.

1 - 30 . (canceled) 
     
     
         31 . A process comprising the application of at least one tetraalkoxysilane layer and at least one functionalized silane layer to a supporting substrate, wherein the at least one tetraalkoxysilane layer and the at least functionalized silane layer are a plurality of layers, each of from 1 to about 10 layers or from 1 to about 5 layers. 
     
     
         32 . The process in accordance with  claim 31 , wherein the plurality of layers are each one layer and wherein said tetraalkoxysilane is applied as a first layer to said supporting substrate prior to the application of said functionalized silane second layer, said tetraalkoxysilane first layer in contact with said supporting substrate, and said functionalized second layer in contact with said first layer. 
     
     
         33 . The process in accordance with  claim 32 , wherein said tetraalkoxysilane is a tetramethoxysilane, a tetraethoxysilane, a tetrapropoxysilane, a tetrabutoxysilane, a tetrapentoxysilane, a tetrahexaoxysilane, a tetraheptoxysilane, or a tetraoctoxysilane, the functionalized silane is an aminoalkylaminoalkyltrialkoxysilane, an aminoalkyalkoxysilane, an aminoalkyltrialkoxysilane, a vinylsilane, an allysilane, or mixtures thereof, and said supporting substrate is a metal or metal containing substance. 
     
     
         34 . The process in accordance with  claim 31 , wherein said tetraalkoxysilane is tetraethoxysilane, said functionalized silane is an aminopropyltriethoxysilane, and said tetraethoxysilane is applied to said substrate as a first layer and said functionalized silane is applied as a second layer in contact with said first layer and wherein said substrate is steel. 
     
     
         35 . The process in accordance with  claim 31 , wherein said at least one tetraalkoxysilane layer and said at least one functionalized silane layer are applied as coatings from separate solutions thereof and wherein said at least one for said tetraalkoxysilane is from 1 to 3 layers and said at least one for said functionalized silane is from 1 to 4 layers and wherein said tetraalkoxysilane layer is applied to said supporting substrate prior to the application of said functionalized silane layer. 
     
     
         36 . The process in accordance with  claim 35 , wherein said separate solutions further comprise a mixture of acids, a glycol, and as an optional component water. 
     
     
         37 . The process in accordance with  claim 36 , wherein the acids are selected from nitric acid and citric acid; said glycol is diethylene glycol monobutyl ether and said water is distilled water and wherein at least one tetraalkoxysilane layer is one layer and said at least one functionalized silane layer is one layer. 
     
     
         38 . The process in accordance with  claim 35 , wherein said at least one tetraalkoxysilane layer and said at least one functionalized silane layer are applied as coatings from separate solutions thereof comprising a dialkylene glycol alkylether and water. 
     
     
         39 . The process in accordance with  claim 38 , wherein said dialkylene glycol alkylether is a diethylerne glycol monobutylether. 
     
     
         40 . The process in accordance with  claim 39 , wherein said resulting supporting substrate is free of corrosion for extended time periods from about 500 to about 3,000 experimental hours subsequent to drying. 
     
     
         41 . The process in accordance with  claim 31 , wherein each layer has a thickness of from about 0.05 microns to about 25 microns. 
     
     
         42 . The process in accordance with  claim 31 , wherein said supporting substrate has a surface painted with water based paints, solvent based paints, or powder-coat paints, and wherein said surfaces of cold-roll steel or hot-rolled steel are substantially free of corrosion for extended time periods of from about 2 years to about 7 years. 
     
     
         43 . A corrosion resistant composition comprising a tetraalkoxysilane and a functionalized silane selected from the group consisting of an aminoalkylaminoalkyltrialkoxysilane, an aminoalkylaminoalkylalkoxysilane, an aminoalkylalkoxysilane and a vinylsilane. 
     
     
         44 . The corrosion resistant composition in accordance with  claim 43 , wherein said alkyl contains from 1 to about 6 carbon atoms, and said alkoxy contains from 1 to about 8 carbon atoms. 
     
     
         45 . The corrosion composition in accordance with  claim 43 , wherein said tetraalkoxysilane is tetraethoxysilane and said functionalized silane is aminoethylaminopropyltrimethoxysilane. 
     
     
         46 . The corrosion composition in accordance with  claim 43 , wherein said tetraalkoxysilane is tetraethoxysilane and said functionalized silane is (3-aminopropyl)triethoxysilane. 
     
     
         47 . The corrosion composition in accordance with  claim 43 , further comprising a component that forms a solution thereof and wherein alkyl and alkoxy of said tetraalkoxysilane and said functionalized silane of an aminoalkylaminoalkylalkoxysilane, and an aminoalkylalkoxysilane contain from 1 to about 10 carbon atoms. 
     
     
         48 . The corrosing composition in accordance with  claim 47 , wherein said component comprises a dialkylene glycol alkylether and water. 
     
     
         49 . A metal or metal alloy surface comprising one or more layers of the corrosion resistant composition of  claim 43 , on a surface of said metal or metal alloy surface. 
     
     
         50 . A corrosion resistant composition system comprising a first composition comprising a tetraalkoxysilane and a second composition comprising a functionalized silane selected from the group consisting of an aminoalkylaminoalkyltrialkoxysilane, an aminoalkylaminoalkylalkoxysilane, an aminoalkylalkoxysilane and a vinylsilane, for providing corrosion resistance on a metal substrate or metal containing substance.