CHROME-FREE MATERIAL FOR INSULATION COATING OF NON GRAIN-ORIENTED ELECTRICAL STEEL Russian patent published in 2015 - IPC C09D5/25 

FIELD: metallurgy.

SUBSTANCE: invention relates to chrome-free material for an insulation coating of non grain-oriented electrical steel. Material contains the following components with the corresponding weight fractions: primary acid salt of metal of phosphorus acid in the volume of 100 fractions, epoxy resin in the volume of 10-60 fractions, a drying agent - naphthenate or a drying agent - salt of metal of isooctane acid in the volume of 0.001-10 fractions, an organic solvent in the volume of 0.001-100 fractions and clean water in the volume of 60-2000 fractions. As primary acid salt of metal of phosphorus acid there used is Al(H₂PO₄)₃, Mg(H₂PO₄)₂, Ca(H₂PO₄)₂, Zn(H₂PO₄)₂. As epoxy resin there used is water-soluble epoxy resin or an epoxy resin emulsion.

EFFECT: after chrome-free material of an insulation coating is applied to non grain-oriented electrical steel, it has highly transparent appearance, excellent insulation properties, corrosion resistance, adhesion ability, weldability and processibility, which eliminates demerits inherent in existing chrome-free coatings, for example adhesiveness and bad wear resistance, as well as meets environmental protection requirements.

5 cl, 4 tbl