| abstract |
A surface treatment agent and a surface treatment method capable of imparting excellent corrosion resistance while improving the adhesion between the surface of a metal material and a resin-containing layer. A surface treatment agent for treating the surface of a metal material, comprising an acrylic resin containing a carboxyl group and a hydroxyl group, an oxazoline group-containing compound and metal particles, wherein the metal particles comprise Nb, Ca and A surface treatment agent comprising particles containing at least one metal selected from the group consisting of Nd. The metal particles are preferably niobium oxide sol. [Selection figure] None |