| 摘要 |
A treatment solution for insulation coating for grain-oriented electrical steel sheets contains at least one selected from phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn; colloidal silica in a proportion of 0.5 to 10 mol in terms of SiO 2 and a water-soluble vanadium compound in a proportion of 0.1 to 2.0 mol in terms of V, relative to PO 4 :1 mol in the phosphates. The treatment solution prevents the reduction of tension induced by a coating and moisture-absorption resistance, which are issues for chromium-free treatment solutions for insulation coating, and provides properties, such as tension induced by a coating, moisture-absorption resistance, rust resistance, and lamination factor, required for insulation coatings for grain-oriented electrical steel sheets, the properties being comparable to those obtained by the use of chromium-containing treatment solutions for insulation coating.
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