| abstract |
An object of the present invention is to provide a surface treatment agent and a surface treatment method capable of imparting excellent corrosion resistance while enhancing adhesion between a surface of a metal substrate and a resin-containing layer. Disclosed is a surface treatment agent for treating a surface of a metal substrate, comprising: an acrylic resin having a carboxyl group and a hydroxyl group, an oxazoline group-containing compound and metal particles, wherein the metal particles are particles containing at least one metal selected from the group consisting of Nb, Ca and Nd. The metal particles are preferably in the form of a niobium oxide sol. |