METHOD OF PHOSPHATORY OF MAGNETIC-ALUMINIUM ALLOYS OF TYPE PERMALLOY (VERSIONS) Russian patent published in 2017 - IPC C23C28/00 C23C22/78 C23C22/13 C23C22/18 C25D3/22 C25D3/24 

FIELD: chemistry.

SUBSTANCE: first version of the method involves applying a galvanic zinc coating from a zincate electrolyte containing ZnO-6-14 g/dm³ and NaOH is 80-140 g/dm³, at a current density of 3-4 A/dm², the ratio of the anode and cathode surface 1:2 and temperature 15-30°C for 5-7 minutes. After that, a layer of zinc is applied to the phosphate layer at a temperature of 95-98°C for 2-3 minutes with a solution containing, g/dm³: P₂O₅ - 7.4-9.8, Mn²⁺ - 2.1-2.8, Zn²⁺ - 11.0-13.0, NO₃^- - 21.0-25.0, NO₂^- - 0.3-0.5. In the second version of the method, a galvanic zinc coating is applied to the surface of the alloy from a cyanide electrolyte containing ZnO-15-45 g/dm³, NaCN - 30-120 g/dm³, NaOH 35-100 g/dm³, with a current density of 1-5 A/dm², the ratio of anode and cathode surface 1:1 and temperature 15-30°C for 14-17 minutes, after which the phosphate layer is applied in the first version.

EFFECT: obtaining a dense, fine-crystalline homogeneous phosphate film with a thickness of 8-15 mcm, having a breakdown voltage not lower than 70 V.

4 cl, 2 ex