Novel non-chrome metal treatment composition

Abstract

Chromate-free compositions for applying a conversion or passivation coating for metals, more particularly zinc coated metal surfaces. The methods of the invention comprise contacting the requisite metal surface with a phosphonomethylated polyamine. Other aspects of the disclosed tech involve methods and compositions in which the following optional components can be included: fluoacid, silane, inorganic phosphorus, acid, latex film forming component and pH adjustment agent.

1 . Composition for treating metal surfaces to form a conversion or passivation coating thereon, said composition comprising (a) a phosphonomethylated polyamine, (b) a fluoacid, (c) a silane, (d) an inorganic phosphorus acid, and water. 
     
     
         2 . Composition for treating metal surfaces to form a conversion or passivation coating thereon, said composition comprising 
       
         
           
                 
                 
                 
                 
               
                     
                     
                 
                     
                   (a) 
                   0.01-40 wt % 
                   phosphonomethylated polyamine 
                 
                     
                   (b) 
                   0.00-40 wt % 
                   fluoacid 
                 
                     
                   (c) 
                   0.00-20 wt % 
                   silane 
                 
                     
                   (d) 
                   0.00-50 wt % 
                   inorganic phosphorus acid 
                 
                     
                   (e) 
                   0.00-40 wt % 
                   film forming latex 
                 
                     
                   (f) 
                    0.00-5 wt % 
                   lubricity additive 
                 
                     
                     
                 
             
                
               
               
                
                
                
                
                
                
                
               
            
           
         
       
       remainder water, wherein the weight of the composition is, in total, 100 wt %. 
     
     
         3 . Composition as recited in  claim 1  comprising 
       
         
           
                 
                 
                 
                 
               
                     
                     
                 
                     
                   (a) 
                   0.01-40 wt % 
                   phosphonomethylated polyamine 
                 
                     
                   (b) 
                     1-30 wt % 
                   fluoacid 
                 
                     
                   (c) 
                   0.01-20 wt % 
                   silane 
                 
                     
                   (d) 
                     1-30 wt % 
                   inorganic phosphorus acid 
                 
                     
                   (e) 
                   0.00-40 wt % 
                   film forming latex 
                 
                     
                   (f) 
                    0.00-5 wt % 
                   lubricity additive 
                 
                     
                     
                 
             
                
               
               
                
                
                
                
                
                
                
               
            
           
         
       
       remainder water and pH adjustment agent, wherein the weight of the composition is, in total, 100 wt %. 
     
     
         4 . Composition as recited in  claim 3  wherein said fluoacid (b) comprises H 2 TiF 6 , said silane (c) comprises an aminosilane and said inorganic phosphorus acid comprises H 3 PO 4 . 
     
     
         5 . Composition as recited in  claim 4  being devoid of chromium.