Chemical treatment liquid and method for chemical treatment of target metal material

Abstract

The objective of the present invention is to provide a chemical treatment liquid capable of forming a coating having improved corrosion resistance. The present invention relates to a chemical treatment liquid containing a water-soluble titanium complex ion, a water-soluble vanadium-containing ion, and 0.03 mol/L or more of an oxidizing agent, wherein the concentration of a fluorine ion is 0 to 0.3 g/L, or alternatively, a fluoride releasing a fluorine ion other than of a fluoro complex is not added.

1 . A chemical treatment liquid comprising a water-soluble titanium complex ion, a water-soluble vanadium-containing ion, and 0.03 mol/L or more of an oxidizing agent, wherein a concentration of a fluorine ion is 0 to 0.3 g/L. 
     
     
         2 . A chemical treatment liquid comprising a water-soluble titanium complex ion, a water-soluble vanadium-containing ion, and 0.03 mol/L or more of an oxidizing agent, wherein a fluoride that releases a fluorine ion other than a fluoro complex is not added to the chemical treatment liquid. 
     
     
         3 . The chemical treatment liquid according to  claim 1 , wherein pH is 2.0 to 5.0. 
     
     
         4 . The chemical treatment liquid according to  claim 1 , wherein the oxidizing agent contains a nitrate salt that releases nitric acid and/or a nitrate ion. 
     
     
         5 . The chemical treatment liquid according to  claim 1 , wherein the water-soluble titanium complex ion is a titanium complex fluoride ion. 
     
     
         6 . The chemical treatment liquid according to  claim 1 , wherein a concentration of the water-soluble titanium complex ion in terms of titanium is 0.15 to 10 g/L. 
     
     
         7 . The chemical treatment liquid according to  claim 1 , wherein the water-soluble vanadium-containing ion is a vanadium compound ion containing pentavalent vanadium. 
     
     
         8 . The chemical treatment liquid according to am  claim 1 , wherein a concentration of the water-soluble vanadium-containing ion in terms of vanadium is 0.4 to 15 g/L. 
     
     
         9 . The chemical treatment liquid according to  claim 1 , further comprising at least one additional water-soluble metallic salt containing Zn, Co, W, Zr, Mn, Mo, Ta, Ce, Sr, or Fe. 
     
     
         10 . The chemical treatment liquid according to  claim 1 , that does not contain a hexavalent chromium ion and/or a trivalent chromium ion. 
     
     
         11 . The chemical treatment liquid according to  claim 1  for use on a zinc-containing metal material. 
     
     
         12 . A method for chemical treatment of a target metal material, comprising a step of immersing the target metal material into the chemical treatment liquid according to  claim 1  or a step of spraying the chemical treatment liquid according to  claim 1  onto the target metal material. 
     
     
         13 . The method according to  claim 12 , wherein the target metal material is a zinc-containing metal material.