COMPOSITION FOR AMORPHOUS PHOSPHATIZATION OF METAL SURFACES Russian patent published in 1999 - IPC

FIELD: chemical treatment of metal surfaces, particularly, concentrated compositions used for preparation of solutions for amorphous phosphatization of steels and nonferrous metals (zinc, aluminium and their alloys). SUBSTANCE: phosphatizing composition contains, wt%: dihydrophosphates of alkali metals or ammonia (in terms of P₂O₅) 40-58; molybdate (in terms of Mo⁶⁺) 0.1-2.0; surfactant 0.33-3.3; acid activating additive in form of mixture of succinic and oxalic acids with their ratio of 0.1-0.8 1.0-6.0. Composition may be supplied in dry (powdery) or liquid form according to Customer's request. EFFECT: ecologically clean, high-quality amorphous coating concurrently with degreasing of phosphatized articles, reduced foam and slime formation. 2 cl, 1 tbl, 24 ex