CHEMICAL REMOVAL OF SURFACE DEFECTS FROM TEXTURED ELECTRICAL STEEL Russian patent published in 2016 - IPC C23F1/28 C23F1/02 C21D8/12 

FIELD: metalworking.

SUBSTANCE: invention relates to treatment of electrical steel coated with factory glass and having defects in the form of iron cusps. Method involves processing at least part of the surface of electrical steel coated with factory glass with an acid solution for a time sufficient to decrease average height of iron defects on the surface down to average height within the range from 0 % to 150 % of thickness of the factory glass coating without removing the factory glass coating. Method applies an acid solution containing an organic acid, and after the said treatment the electrical steel coated with factory glass is washed with water and dried.

EFFECT: invention allows reducing the height of defects present onto a factory glass coated electrical steel in the form of iron cusps.

22 cl, 61 dwg, 8 ex