AQUEOUS SURFACE TREATING AGENT FOR METAL MATERIAL, SURFACE TREATING METHOD AND SURFACE-TREATED METAL MATERIAL

摘要

Disclosed is an aqueous metal surface treating agent containing an organosilicon compound and an organic polymer selected from urethane resins, epoxy resins, acrylic resins, phenol resins, polyester resins and polyolefin resins. The organosilicon compound has, in one molecule, two or more functional groups (a) represented by the following formula: -SiR¹R²R³ (wherein R¹, R² and R³ respectively represent an alkyl group, an alkoxy group or a hydroxyl group, provided that at least one of them represents an alkoxy group) and one ore more hydrophilic functional groups (b) selected from a hydroxyl group, amino group, carboxyl group, phosphoric acid group, phosphonic acid group, sulfonic group, polyoxyethylene chain and amide group; and the molecular weight per one functional group (b) is 100-10,000. Also disclosed are a surface treating method and a surface-treated metal material. Such a surface treating agent enables to form a coating film having not only excellent corrosion resistance and adhesiveness but also acid resistance and alkali resistance on a metal material surface.