Hydrophilizing treatment agent, hydrophilizing treatment fluid, and method of hydrophilizing treatment

By containing N- acetyl vinyl amine (vinylacetoamide) having a COOX group (wherein, X is a hydrogen atom, an alkali metal atom or ammonium) between the amount of polymerizable monomer a hydrophilic polymer copolymer (a) , water-soluble urethane resin (B), and inorganic silica (silica) (c) a hydrophilizing agent, a metal material to impart surface hydrophilicity and corrosion resistance.