Electrically insulating coating for anisotropic electrical steel

Abstract

Composition of an electrically insulating coating based on phosphates of aluminum and magnesium and a silica sol for grain-oriented electrical steel is described. The composition can have the following ratio of components: 20-40 wt. % Al and Mg phosphates, 20-45 wt. % silica sol, and modifying additives in the form of 0.01-2 wt. % zirconium silicate ZrSiO4, 0.1-3 wt. % potassium orthovanadate K3VO4, 0.1-3 wt. % vanadyl hydrogen phosphate VOHPO4 and 0.1-2 wt. % manganese oxide-hydroxide MnO(OH), and water to 100 wt. %. The result is an electrically insulating coating that does not contain chromium compounds (CrIII and CrVI) and that exhibits high corrosion and moisture resistance values, excellent adhesion to metal, a good appearance, and a high coefficient of electrical resistance.

Dependencies are inferred from the claim text.