COMPOUND FOR FORMING INSULATING COAT Russian patent published in 2003 - IPC

FIELD: treatment of steel for forming coats on its surface; electrical industry. SUBSTANCE: proposed compound contains ions of phosphate, aluminum, magnesium, boron, water and ions of chromium introduced in form of waste solutions of chromium-plating baths and additionally containing fluorosilicic acid and silicon dioxide at the following ratio of components, mass-%: phosphate ions (in terms of P₂O₅)), 258-29.9; aluminum ions (Al⁺³)0,8-1,7; magnesium ions Mg⁺²)1,3-; boron ions (in terms of B₂O₃)0, 0.11-0.17; chromium ions Cr⁺⁶), 0.2-0.5; fluorosilicic acid, 22.0-28.0; silicon dioxide (SiO₂), 0.2-1.0; water, up to 100. EFFECT: enhanced moisture resistance and magnetic activity at retained physico-mechanical and magnetic properties of coat. 1 tbl, 3 ex