METHOD FOR ANTI-CORROSION PROCESSING OF METAL SURFACE WITH REDUCED ETCHING OF MATERIAL Russian patent published in 2021 - IPC C09D5/08 

FIELD: chemistry.

SUBSTANCE: group of inventions relates to a method and an aqueous composition for anticorrosive processing of a metal surface. The processing method consists in the fact that the metal surface is alternately brought into contact with the following aqueous compositions: i) an alkaline or acidic composition of the cleaner, ii) the first washing composition, iii) optionally the second washing composition, iv) an acid conversion composition, v) optionally the third washing composition and vi) a composition including a CAP based on (meth)acrylate and/or epoxide, wherein at least one of the compositions i)-v) includes at least one compound of formula I

,

and R¹ and R² each, independently of each other, mean H or HO-(CH₂)_w-group with w≥2, x and y each, independently of each other, mean from 1 to 4, and Z means an S atom or a triple C-C bond.

EFFECT: invention makes it possible to reduce the corrosion removal of the material during the anticorrosive processing of metal surfaces.

20 cl, 1 dwg, 4 tbl