METHOD FOR PRODUCTION OF HYBRID PROTECTIVE COATINGS WITH ANTIBACTERIAL PROPERTIES ON MAGNESIUM ALLOYS Russian patent published in 2022 - IPC C25D11/30 

FIELD: electroplating.

SUBSTANCE: invention relates to the field of electroplating; it can be used in implantation surgery in the manufacture of implants for different functional purposes, operated in a corrosion-active medium mainly containing chloride ions, in particular, in tissue fluid of the human body, as well as in blood plasma. The method includes plasma electrolytic oxidation (hereinafter – PEO) of a magnesium alloy in an aqueous electrolyte containing, g/l: calcium glycerophosphate 25-30, sodium fluoride 5-6, and sodium silicate 8-10, in a pulse bipolar mode, for 110-120 s, potentiostatically at 370-380 V, during anode polarization of an oxidized surface, in a galvanic-dynamic mode, with a current density changing from 1.3 to 0.8 A/cm², during its cathode polarization to obtain basic PEO coating. An alloy surface with coating is treated with an aqueous solution of 8-oxyquinoline C₉H₇NO corrosion inhibitor (3-5 g/l). The resulting hybrid layer is covered with fluoropolymer by immersion for 15 s, from one to three times, in a suspension containing 15 wt.% of ultra-dispersed polytetrafluorethylene in isopropanol, with thermal processing at 260-270°C, for 12-15 min after each immersion, with subsequent cooling, washing, and drying in air.

EFFECT: increase in technical and economic indicators of a method, prolonged action of anticorrosion and antibacterial properties, increase in strength and durability of coatings obtained using this method due to formation of a “self-curing” capability in them.

1 cl, 3 dwg, 1 tbl, 4 ex