Metal surface treatment agent

Abstract

The present invention relates to a metal surface treatment agent that characteristically contains (A) at least 1 vanadium compound and (B) at least one metal compound containing at least 1 metal selected from the group consisting of zirconium, titanium, molybdenum, tungsten, manganese, and cerium. The present invention also relates to a metal surface treatment method using the foregoing treatment agent and the corresponding surface-treated metals. The present invention provides a metal surface treatment agent that does not contain chromium and that can be used to impart an excellent corrosion resistance and alkali resistance to metals. The present invention provides a metal surface treatment method that uses the foregoing treatment agent and also provides the corresponding surface-treated metals.

What is claimed:  
     
         1 . A metal surface treatment agent comprising: 
 (A) at least 1 vanadium compound; and    (B) at least one metal compound containing at least 1 metal selected from the group consisting of zirconium, titanium, molybdenum, tungsten, manganese, and cerium.    
     
     
         2 . The metal surface treatment agent of  claim 1 , wherein the ratio in the vanadium compound (A) of vanadium ions in the pentavalent oxidation state to the total vanadium V 5+ /V is in the range of 0 to 0.6.  
     
     
         3 . The metal surface treatment agent of  claim 1  or  2 , further comprising (C) an organic compound that contains at least 1 functional group selected from the group consisting of hydroxyl groups, carbonyl groups, carboxyl groups, primary to tertiary amino groups, amide groups, phosphoric acid groups, and phosphonic acid groups, wherein the organic compound (C) is present in an amount of 0.05 to 10 mass parts per 1 mass part pentavalent oxidation state vanadium in the vanadium compound.  
     
     
         4 . The metal surface treatment agent of any of  claims 1  to  3 , further comprising (D) at least 1 etchant selected from the group consisting of inorganic acids, organic acids, and fluorine compounds, wherein the etchant (D) is present in an amount of 1 to 100 g/l.  
     
     
         5 . The metal surface treatment agent of any of  claims 1  to  4 , wherein the vanadium compound (A) is present in an amount of 1 to 100 g/l as vanadium and the metal compound (B) is present in an amount of 1 to 100 g/l as metal.  
     
     
         6 . The metal surface treatment agent of any of  claims 1  to  5 , wherein the vanadium compound (A)/metal compound (B) mass ratio is 1/9 to 9/1 calculated on the metal.  
     
     
         7 . The metal surface treatment agent of any claims  1 - 6 , further comprising (E) a water-dispersible or water-soluble organic polymer.  
     
     
         8 . A method for treating a metal surface comprising: 
 treating the metal surface with a metal surface treatment agent according to any of  claims 1  to  7 ; and    drying by heating so the temperature of the metal reaches 50 to 250° C.    
     
     
         9 . A surface-treated metal that bears a coating formed using the surface treatment method of  claim 8 .  
     
     
         10 . A surface-treated metal that bears a coating formed using the surface treatment agent of any of  claims 1  to  7 .  
     
     
         11 . A surface-treated metal of  claim 10  further comprising an organic polymer coating, wherein the organic polymer coating comprises a water-dispersible or water-soluble organic polymer having a glass transition temperature of 0 to 120° C.