INSULATING FILM TREATING LIQUID FOR GRAIN ORIENTED ELECTROMAGNETIC STEEL PLATE, AND PROCESS FOR PRODUCING GRAIN ORIENTED ELECTROMAGNETIC STEEL PLATE WITH INSULATING FILM

摘要

To obtain a treatment solution for insulation coating for grain oriented electrical steel sheet capable of providing a grain oriented electrical steel sheet having excellent insulation coating properties, i.e., tension induced by a coating, moisture-absorption resistance, rust resistance, and lamination factor, while preventing the reduction in the tension induced by a coating and the moisture-absorption resistance which causes problems when the treatment solution for insulation coating is rendered chromium-free by preparing the treatment solution using one or two or more members selected from phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn, and, based on PO 4 in the selected one or two or more phosphates, colloidal silica in a proportion of 0.5 to 10 mol in terms of SiO 2 and one or two or more members selected from permanganates of Mg, Sr, Zn, Ba, and Ca in a proportion of 0.02 to 2.5 mol in terms of metal elements in the permanganates, relative to PO 4 :1 mol.