Chemical conversion treatment agent, coating pre-treatment method, and metal member

Abstract

Provided is a chemical conversion treatment agent that has a small impact on the environment and can ensure good post-coating corrosion resistance regardless of the target of treatment. A chemical conversion treatment agent including: at least one type (A) of element selected from the group consisting of zirconium, titanium, and hafnium; at least one type (B) of substance selected from the group consisting of amino group-including silane coupling agents, hydrolysates thereof, and polymers thereof; fluorine (C); and a cationic urethane resin (D). Preferably, the content of (A) is 20-10000 mass ppm in total in terms of metals, and the pH is 1.5-6.5.

1 . A chemical conversion treatment agent, comprising: at least one (A) selected from the group consisting of zirconium, titanium, and hafnium;
 at least one (B) selected from the group consisting of an amino group-containing silane coupling agent, hydrolysates thereof, and polymers thereof;   fluorine (C); and   a cationic urethane resin (D).   
     
     
         2 . The chemical conversion treatment agent according to  claim 1 , wherein the total content of (A) is 20 to 10000 ppm by mass in terms of metal, and
 pH is 1.5 to 6.5.   
     
     
         3 . The chemical conversion treatment agent according to  claim 1 , wherein the total content of (B) is 5 to 5000 ppm by mass in terms of a solid content concentration, and
 the content of (D) is 5 to 5000 ppm by mass in terms of a solid content concentration, and   the solid content mass ratio ((B)/(D)) of (B) to (D) is 0.0002 to 5000.   
     
     
         4 . The chemical conversion treatment agent according to  claim 1 , further comprising at least one adhesiveness and corrosion resistance-conferring agent selected from the group consisting of magnesium ions, zinc ions, calcium ions, aluminum ions, gallium ions, indium ions, and copper ions. 
     
     
         5 . A pre-coating treatment method, comprising: treating a target workpiece with the chemical conversion treatment agent according to  claim 1 . 
     
     
         6 . A metal member treated by the pre-coating treatment method according to  claim 5 .