| abstract |
(57) [Abstract] [Purpose] To provide a chromium-free composition for surface treatment of electromagnetic steel sheet and a surface-treated electromagnetic steel sheet excellent in film adhesion, insulation, corrosion resistance, weldability, workability, and sticking resistance. . [Structure] 5 to 100 parts by weight of a hydroxyl group-containing monomer component and 0.5 to 40 parts by weight of a carboxyl group-containing monomer component as an copolymer resin, and 5 to 100 parts by weight of phosphoric acid, Mn, 1 for compounds of Mg, Al, Ba, Ca, Sr 20 to 200 parts by weight of two or more species, SiO 2 , ZrO 2 , Sn One or two of O 2 , Al 2 O 3 and Sb 2 O 5 colloids (sols) A composition for surface treatment of an electromagnetic steel sheet, which comprises 5 to 150 parts by weight of one or more kinds, and an electromagnetic steel sheet treated with the composition. |