METHOD FOR OBTAINING PROTECTIVE SUPERHYDROPHOBIC COATINGS WITH ANTISTATIC EFFECT ON ALUMINUM ALLOYS Russian patent published in 2022 - IPC C25D11/04 C23C28/00 

FIELD: superhydrophobic coatings.

SUBSTANCE: invention relates to the production of protective superhydrophobic coatings with an antistatic effect on products and structures made of aluminum alloys and can be used in the preparation of structural materials for mechanical engineering, automotive, aviation and aerospace engineering, electrical and radio engineering, for the production of computer equipment and other industries. The method includes surface treatment of the alloy by plasma electrolytic oxidation with variable polarization of the treated sample in an electrolyte containing sodium tetraborate, followed by application of a fluoropolymer in an organic solvent to the formed PEO coating, followed by drying, while PEO is carried out in an electrolyte containing, g/l: sodium orthophosphate Na₃PO₄ 12H₂O 10-50, sodium molybdate Na₂MoO₄ 2Н₂O 5-20 and sodium tetraborate Na₂B₄O₇⋅12H₂O 10-30, for 10-40 min at a current density of 0.1-0.2 A/cm² during anodic polarization of the sample and 0.05-0.1 A/cm² during its cathodic polarization, the polymer film is applied by spraying a mixture obtained by introducing into the TUBALL composition, which is a 2% solution of polyvinylidene fluoride (PVDF) in N-methyl-2-pyrrolidone, containing 0,4 wt.% carbon nanotubes SWCNT, the addition of ultradispersed polytetrafluoroethylene powder in an amount that provides the mass ratio of PVDF : PTFE = 1: (1-5), while the coated samples are dried at a temperature of 40-70°C for 1-3 hours.

EFFECT: increasing the protective properties and increasing the service life of the resulting coatings by maintaining their hydrophobic properties due to the formation of conductive coatings with antistatic properties.

1 cl, 2 dwg, 3 ex