METHOD FOR OBTAINING COMPOSITE MULTIFUNCTIONAL COATINGS ON MAGNESIUM ALLOYS Russian patent published in 2022 - IPC C25D11/30 

FIELD: protective coatings.

SUBSTANCE: invention relates to a technology for applying protective coatings to magnesium alloys, providing active anti-corrosion protection of prolonged action, and can be used in the processing of parts and structures made of magnesium alloys in instrument making, aircraft and automotive, electrical and radio engineering, computer, space and defense industries. The method includes plasma electrolytic oxidation carried out in an aqueous electrolyte containing sodium silicate and sodium fluoride for 10-15 min in a bipolar mode to obtain a base PEO coating with a porous outer layer, which, after washing and drying, is treated with an aqueous solution of a corrosion inhibitor 8- oxyquinoline C₉H₇NO by immersion in the above solution at room temperature for 100-120 min, while the oxidation is carried out in an electrolyte containing, g/l: sodium silicate Na₂SiO₃⋅5H₂O 12-15 and sodium fluoride NaF 5-10, applied base PEO coating , treated with 8-hydroxyquinoline, is heated at 80-90°C for 100-120 min, then its surface is modified by immersion for 10-12 s in a solution containing 6 wt.% polyvinylidene fluoride in N-methyl-2-pyrrolidone C₅H₉NO, after which the coating is dried at 65-75°C for 120-140 min and cooled to 20-25°C.

EFFECT: increase in anticorrosion properties and increase in the durability of coatings on magnesium alloys during operation in an aggressive environment due to the effect of self-healing with a simultaneous increase in bactericidal properties, mechanical strength and hydrophobicity.

1 cl, 1 dwg, 1 tbl, 3 ex