METHOD OF PRODUCING ANTICORROSION COATING BASED ON POROUS PEO LAYER IMPREGNATED WITH CORROSION INHIBITOR OF AZOLE GROUP Russian patent published in 2024 - IPC C25D11/06 C09D127/16 

FIELD: various technological processes.

SUBSTANCE: invention relates to an anticorrosion self-healing protective coating on articles, constructions and structures from aluminium alloys, intended for operation in unfavourable conditions, for example, in an atmosphere of sea fog, in corrosive aqueous solutions. Method involves formation of a porous PEO layer in the form of microtubes during plasma electrolytic oxidation (PEO) in galvanostatic mode for 40 s in an electrolyte cooled to 8 °C with potassium tartrate and sodium fluoride, impregnation of microtubes with 1,2,4-triazole or benzotriazole under vacuum, wherein PEO is carried out at current density of 0.5–0.95 A/cm², and impregnation — under vacuum of 0.04 atm. until release of air bubbles with further holding in inhibitor solution while stirring, then drying at 40 °C for 24 hours and applying a protective layer of polyvinylidene fluoride (PVDF) by spraying a solution of PVDF in methylpyrrolidone in ratio of 1:20 wt.pts.

EFFECT: providing long-term self-healing effect in case of violation of integrity of aluminium coating due to finishing hydrophobic layer, obtained by spraying PVDF from a solution on top of an oxide layer on a metal with a microtubular porous structure filled under vacuum with a corrosion inhibitor of a group of azoles.

1 cl, 1 dwg, 6 ex