| abstract |
1 or 2 or more types selected from phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn, based on PO 4 in the selected phosphate, and colloidal with respect to PO 4 : 1 mol When the phase silica is mixed with 0.5 to 10 mol in terms of SiO 2 and 0.1 to 2.0 mol in terms of V, the water-soluble vanadium compound is used, the film tension and hygroscopic resistance which are a problem when the insulating coating treatment liquid is chromium-free. The chromium-free insulation for oriented electrical steel sheet which prevents a fall and is comparable to the case where the insulating film treatment liquid containing a chromium compound has the characteristics required as an insulating film of a grain-oriented electrical steel, ie, film tension, hygroscopicity, rust prevention property, and dripping rate, is used. Obtain a coating treatment liquid. |