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

A surface treatment method for improving the uniformity of a coating film by cathodic electrodeposition, wherein the surface treatment method is a chemical conversion film on a metal base material by contacting the metallic base material with a surface treatment composition metal comprising zirconium ions and / or titanium ions and an agent imparting adhesive characterized by being at least one selected from the group consisting of the silicon-containing compound (a) and resin imparts adhesive (C), wherein resin which imparts adhesive is a polyamine compound comprising at least one constituent unit represented by the chemical formulas (1), (2) and / or (3) shown below, and the proportion of the total amount of zirconium ions and / or titanium to the mass of the polyamine compound is 0.1 to 100, and wherein ** (See formula) ** in the chemical formula (3), R1 is a group alkylene having 1 to 6 carbon atoms, R2 is a substituent group represented by the following chemical formulas (4) to (6) shown below, and R3 is a hydroxyl group, an alkoxy group having 1 to 6 carbon atoms or an alkyl group having 1 to 6 carbon atoms, and ** (see formula) ** in the chemical formula (6), R6 is a hydrogen atom, an aminoalkyl group having 1 to 6 carbon atoms or a alkyl group having 1 to 6 carbon atoms and R7 is a hydrogen atom or an aminoalkyl group having 1 to 6 carbon atoms, wherein the surface treatment method comprising a step of surface treatment wherein the surface treatment composition metal contact with the metal base material and a step of subsequent treatment for heat treating the metallic base material after the step of surface treatment, and wherein said post treatment process is at least one selected from the gr upo consisting of (1) a process for treating dry the metal base material under atmospheric pressure or pressurized conditions at 60 ° C to 190 ° C for at least 30 seconds, and (2) a process of heat treatment of the base material metal under atmospheric pressure or pressurized conditions in hot water at 60 ° C to 120 ° C for 2 seconds to 600 seconds, and which is then applied a film of the CED coating on thin portions of metal base materials with curves and parts of bags.