COMPOUND FOR PRODUCTION OF DIELECTRIC COATING Russian patent published in 1997 - IPC

FIELD: steel treatment to apply dielectric coatings to its surface; may be used in electrical engineering. SUBSTANCE: applied to anisotropic electrical-sheet steel is compound containing the following components, mas.%: phosphate ions (in terns of P₂O₅), 36.2-38.7; magnesium ions ((Mg⁺²)), 2.1-2.7; aluminum ions ((Al⁺³)), 0.48-0.69; boron ions (in terms of B₂O₃), 0.15-0.22; chromium ions, ((Cr⁺⁶)), 0.35-0.42; water, the balance. In this case chromium ions ((Cr⁺⁶)) are introduced in the form of used solution of chrome-plating bath. EFFECT: increased resistance to water and moisture; improved mechanical and physical properties. 2 cl, 1 tbl