METHOD OF PREPARATION OF METAL SURFACES BEFORE COLD DEFORMATION Russian patent published in 2001 - IPC

FIELD: preparation of metal surfaces before cold deformation (upsetting of fastenings, extruding, drawing pipes and wire, etc) with the use of phosphatization; metallurgy; mechanical engineering; manufacture of wire, calibrated metal and machine elements). SUBSTANCE: activation of surface is performed in phosphatizing activator solution on base of titanium phosphates at concentration of 0.5 to 3.0 g/l or phosphatizing activator on base of oxalic acid at concentration of 3.0 to 5.0 g/l and temperature of 20 to 45 C for 0.5 to 5 minutes by dipping the articles in activating solution; phosphatizing is performed in phosphatizing concentrate solution of the following composition, g/l: ions Zn⁺², 8.0 to 30.0; phosphorous pentoxide P₂O₃, 5.0 to 24.0; NO-3

ions, 15.0 to 45.0; Ni⁺² ions, 0.01 to 0.18; F^- ions, 0.01 to 2.0; hydroxyl aminosulfate, 0.01 to 8.0, water being remainder; procedure is effected by dipping the articles in phosphatizing solution at temperature of 70 to 95 C continued for 5 to 20 minutes. EFFECT: enhanced antifriction properties of coast; considerable reduction of consumption of tools used for cold deformation. 4 ex