| 摘要 |
<p>This invention provides an insulating film treating liquid for a grain oriented electromagnetic steel plate, comprising one or at least two materials selected from phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn, colloidal silica in an amount of 0.5 to 10 mol in terms of SiObased on one mol of POin the selected phosphate, and one or at least two materials, selected from permanganates of Mg, Sr, Zn, Ba, and Ca, in an amount of 0.02 to 2.5 mol in terms of the metallic element contained in the permanganate. The treating liquid can provide a grain oriented electromagnetic steel plate that can prevent a lowering in film tension and moisture resistance which occurs when the insulating film treating liquid is rendered chromium-free, whereby a grain oriented electromagnetic steel plate having excellent insulating film properties, that is, excellent film tension, moisture resistance, rust preventive properties, and space factor can be provided.</p> |
