| abstract |
An aqueous surface-treating agent for metallic materials wherein (A) a water dispersible urethane resin having a glass transition temperature of more than 50°C and a minimal coating-forming temperature of 40°C or less; (B) at least one organic compound selected from methylolated phenols and their condensates, carbodiimide resins, epoxy resins, silane coupling agents, organic phosphonic acids and their partial alkali metal salts/ ammonium salts/ esters with alkanols having 1 to 4 carbon atoms, organic phosphinic acids, phosphoric esters of polyols, amine compounds, isocyanate compounds, aldehyde compunds, carboxylic acids, amino resins and urethane prepolymers whose isocyanato groups are protected by addition reacting an alkali metal bisulfite thereto; and (C) a zirconium compound are compounded in water. By the invention, there are provided the agent capable of forming a coating excellent in corrosion resistance, formability, chemical resistance and moisture resistance; and a surface coated metallic material. |