GLASS CERAMIC FILM ON METALLIC MEMBERS Russian patent published in 1995 - IPC

FIELD: ceramics. SUBSTANCE: solution has hydrogen peroxide, magnesium oxide, silicon oxide as an aerosil, magnesium or aluminium or together magnesium and aluminium at the following ratio of components, wt.-% ortho-phosphoric acid 10-27; chrome anhydride 3-10; 30% solution hydrogen peroxide 2-8; aerosil 2-8; magnesium oxide 1-3; magnesium or aluminium or sum of magnesium and aluminium 0.8-2.0, and water 81.2-42 at the ratios: Al+Mg/H₃PO₄- 0.07-0.08; SiO₂/H₃PO₄= 0.2-0.3; 30% H₂O₂/CrO₃= 0.4-0.8. Working life os solution is increased from 3 days ad infinitum. Film thickness is increased from 0.5-3.0 mcm at 2-10-fold treatment to 10 mcm at single-stage that decreases labor consumption by 2-4-fold. EFFECT: enhanced quality of material, decreased cost. 3 cl, 4 tbl