Chemical conversion treatment agent and surface-treated metal material

Abstract

Disclosed is a chemical conversion treatment agent, which comprises: a film-forming component to form a chemical conversion film in which the number of local low-resistance areas each having an insulation resistance value of 5000Ω or less is 20 or less/100 μm 2 ; and at least one kind of fine particles selected from the group consisting of metal fine particles, semiconductor fine particles and electrically conductive organic fine particles.

1 . A chemical conversion treatment agent comprising:
 a film-forming component to form a chemical conversion film in which the number of local low-resistance areas each having an insulation resistance value of 5000Ω or less is 20 or less/100 μm 2 ; and   at least one kind of fine particles selected from the group consisting of metal fine particles, semiconductor fine particles and electrically conductive organic fine particles.   
   
   
       2 . The chemical conversion treatment agent as defined in  claim 1 , wherein the film-forming component contains, as a primary component, a compound having at least one selected from the group consisting of Zr, Ti, Hf and Si. 
   
   
       3 . The chemical conversion treatment agent as defined in  claim 1 , wherein the film-forming component contains H 2 ZrF 6 . 
   
   
       4 . The chemical conversion treatment agent as defined in  claim 1 , wherein the fine particles have an average primary particle size of 20 to 40 nm. 
   
   
       5 . A surface-treated metal material comprising a chemical conversion film formed using a chemical conversion treatment agent, the chemical conversion treatment agent including: a film-forming component to form a chemical conversion film in which the number of local low-resistance areas each having an insulation resistance value of 5000Ω or less is 20 or less/100 μm 2 ; and at least one kind of fine particles selected from the group consisting of metal fine particles, semiconductor fine particles and electrically conductive organic fine particles, wherein the chemical conversion film is codeposited with the at least one kind of fine particles selected from the group consisting of metal fine particles, semiconductor fine particles and electrically conductive organic fine particles. 
   
   
       6 . The surface-treated metal material as defined in  claim 5 , wherein the chemical conversion film includes an oxide which has, as a primary component, at least one element selected from the group consisting of Zr, Ti, Hf and Si. 
   
   
       7 . The surface-treated metal material as defined in  claim 5 , wherein the fine particles are contained in the chemical conversion film in an amount of 8.2 mass % or less with respect to 100 mass % of the chemical conversion film. 
   
   
       8 . The surface-treated metal material as defined in  claim 5 , wherein the chemical conversion film comprises a primary component consisting of ZrO 2 .