AQUEOUS SOLUTION OF INHIBITOR COMPOSITION FOR FORMING ANTI-CORROSION INHIBITED POLYMER FILM ON SURFACE OF LOW-CARBON STEEL PRODUCTS AND METHOD OF USING IT FOR FORMING ANTI-CORROSION INHIBITED POLYMER FILM Russian patent published in 2024 - IPC C23F11/16 C25D13/08 

FIELD: corrosion protection.

SUBSTANCE: to form an anti-corrosion inhibited polymer film on the surface of low-carbon steel products, an aqueous solution of an inhibitor composition is used comprising organosilane in the form of methacryloxypropyltrimethoxysilane from 75 to 130 ml/l and corrosion inhibitors in the form of 7-aqueous zinc sulphate from 2.4 to 13.2 g/ l and 1-aqueous citric acid from 40 to 1000 g/l. The aqueous solution of the inhibitor composition has a pH in the range of 2-4. An aqueous solution of the inhibitor composition is subjected to ultrasonic treatment in the range of 10 to 30 minutes, depending on the amount of organosilane. Before the formation of an anti-corrosion inhibited polymer film, the steel product undergoes pre-treatment by degreasing the metal surface under the influence of cathodic polarization at a minimum current density in an alkali solution, followed by its activation in an acid solution. Next, cataphoretic deposition is carried out by passing an electric current in the range from 0.8 to 4.0 A/dm² through an aqueous solution of the inhibitor composition for 5 minutes to form dendritic zinc deposits and siloxane layers on them on the surface of low-carbon steel products. After that, excess dendritic zinc deposits and siloxane are removed from the steel surface and the siloxane layers are thermally cured for 10 ÷ 20 minutes at 140 ÷ 160°C.

EFFECT: increased rate of formation of protective layers on the surface of low-carbon steel products, an increased corrosion resistance and adhesive properties.

5 cl, 1 tbl