Method of treating the surface of base metal, treated metal material by the method of surface treatment and coating method of metal material

A method of treating metal to improve uniformity of a coating film CED surfaces, wherein the method comprises: a step of surface treatment for metal base material for treating the surface of a metal base material and form resistant film oxidation using a treatment composition of metal surface comprising zirconium ions and / or titanium and at least one agent imparting adhesive selected from the group consisting of (a) a silicon-containing compound, an ion (B ) imparting metal and imparting adhesive resin (C) adhesive; a post-selected group treatment step consisting of any combination of processes (a) and (d) or any combination of processes (a) and (e), where (a) is a process for treating contact all or part of the metal base material in an alkaline solution having a pH of at least 9, after the surface treatment step; (D) is a process for treating contact all or a portion of the metal base material in an oxidizing agent, after the surface treatment step; (E) is a process for treating contact all or part of the metal base material in an oxidizing agent and then the washing treatment with water after the step of treating the surface; wherein the oxidizing agent is one selected from the group consisting of nitric acid, nitrous acid, sulfuric acid, sulfurous acid, persulfate, phosphoric acid, hydrochloric acid, brominated acid, an iodine compound, chloric acid, hydrogen peroxide, HMnO4, HVO3, H2WO4 H2MoO4 and the respective salt of each; and a step of electrodeposition coating by electro painting metallic material with a coating material by cathodic electrodeposition.