| 摘要 |
<p>A treatment liquid, comprising at least one member selected from among phosphates of Mg, Ca, Ba, Sr, Zn, Al and Mn and further comprising, based on POcontained in the selected phosphate, a water-soluble vanadium compound in an amount of 0.1 to 2.0 mol in terms of V and colloidal silica in an amount of 0.5 to 10 mol in terms of SiOper mol of the PO. This treatment liquid provides a chromium-free insulating coating treatment liquid for grain oriented electromagnetic steel sheet that would prevent any deterioration of coating tension and moisture absorption resistance tending to be a problem when the insulating coating treatment liquid is free of chromium and would have properties required for an insulating coating of grain oriented electromagnetic steel sheet, namely, coating tension, moisture absorption resistance, corrosion resistance and lamination factor comparable to those exhibited in the use of an insulating coating treatment liquid containing a chromium compound.</p> |
