The chrome free insulating coat treatment liquid for the directivity electromagnetic steel sheet which features that it contains above the 1 or 2 kinds which are chosen from inside

摘要

To obtain a treatment solution for chrominul-free 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 remarkably occurs 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 a titanium chelate compound in a proportion of 0.01 to 4.0 mol in terms of Ti, relative to PO 4 :1 mol.