| abstract |
Provided is a chromium-free metal surface treatment agent and the like used for imparting excellent corrosion resistance, alkali resistance and moisture resistance to a metal material. At least one (A) selected from the group consisting of a zirconium compound and a titanium compound (A), hydroxycarboxylic acid, organic phosphonic acid, polyhydric alcohol phosphate ester and phosphoric acid, and salts thereof (B) , And a β-diketone metal complex in which the metal is V, Zn, Mg, Al, Ca, Zr, Ti, Ni, In, Co, Cu, Fe, Mn, Y, Ce, Sr, Ba, Mo, La, or Sn A water-based metal surface treatment agent, a surface treatment method, and a surface-treated metal material obtained by blending at least one of (C). A silane coupling agent (D) and / or colloidal silica (E) can be mix | blended and performance can be improved further. |