| abstract |
FIELD: metallurgy. n SUBSTANCE: invention relates to application on the textured electric flat steel of the phosphate coating. Under method to the electrical flat steel the phosphate solution is applied, it contains at least one chrome (III) composition, colloidal component, and at least one compound ether of phosphoric acid as stabiliser (A) of the colloid and/or at least one etching inhibitor (B) selected from the derivative of thiourea, C 2-10 -alkynol, derivative of triazine, thioglycolic acid, C 1-4 -alkylamine, hedroxy-C 2-8 -thiocarboxylic acid and/or polyglycol ether of fatty alcohol, in particular diethyl sulphourea, prop-2-in-1-ol, butyn-1,4-diol, thioglycolic acid, and/or hexamethylenetetramine, at that phosphate solution is used, hexavalent chrome content in it is below 0.2 wt %. n EFFECT: invention produces the phosphate layer on the textured electric flat steel having properties identical to properties of chrome (VI) containing insulation coating, and having improved optical properties and increased tension stress. n 13 cl, 17 dwg, 10 tbl, 7 ex |