COMPOSITION FOR TREATING METALLIC SURFACE Russian patent published in 1998 - IPC

FIELD: chemical industry, more particularly treatment of metallic surface of preferably large-size and intricately shaped structures. SUBSTANCE: claimed composition comprises (wt %) 50-60 85% orthophosphoric acid; 2.5-3.0 zinc nitrate; 3.0-4.0 potassium ferricyanide; 0.3-0.6 fluoro-carbon compound of formula: R_fZQ wherein R_f is C₆F₁₃; C₆F₁₇; C₂F₃-OC₃F₆OC₂F₄-; Z is -CO-; SO₂ Q is NHC₂H₄OH; ; . Composition forms highly strong anticorrosion coating on metallic surface. Said coating serves as primer for paint materials. Use of the claimed composition requires no preliminary cleaning of metallic surface from rust. EFFECT: improved properties of the composition. 2 tbl