METHOD OF COATING OBTAINMENT Russian patent published in 2010 - IPC C25D11/12 C25D15/00 

FIELD: chemistry.

SUBSTANCE: method involves oxidation for 60-90 minutes at current density of 25- 35 A/dm², during which oxygen of 5-15°C is supplied to part detail through sprayer contacting cathode at the flow rate of 0.1-1.0 m³/minute per square metre of oxidised surface, and detail performs advancing and rotating movement at 10-30 mm distance from the sprayer. Before oxidation, electrolytes are heated to 70-80°C, stirred and cooled down to 15-20°C, and oxidation is performed first for 10 minutes in electrolyte containing 6-8 g/l of caustic potash and 40-50 g/l of boric acid, then for 15-20 minutes in electrolyte containing 6-8 g/l of caustic potash, 40-50 g/l of boric acid, 40-60 g/l of fine-dispersed corundum of 3-5 mcm fraction and 1-2 g/l of chrome oxide, then for 25-35 minutes in electrolyte containing 6-8 g/l of caustic potash, 40-50 g/l of boric acid, 4-60 g/l of fine-dispersed corundum of 5-7 mcm fraction and 1-2 g/l of chrome oxide, and further in electrolyte containing 6-8 g/l of caustic potash, 40-50 g/l of boric acid, 40-60 g/l of fine-dispersed corundum of 7-10 mcm fraction and 1-2 g/l of chrome oxide.

EFFECT: reduced power, enhanced productivity and increased thickness, hardness, breakdown voltage and electric resistance of coatings formed.

2 tbl, 2 dwg, 1 ex