COMPOSITION FOR CORROSION INHIBITION CONTAINING 2-SUBSTITUTED BENZIMIDAZOLE AND METHOD OF CORROSION INHIBITION USING 2-SUBSTITUTED BENZIMIDAZOLE Russian patent published in 2023 - IPC C07D235/08 C07D235/12 C07D235/18 C07D401/04 C23F11/14 

FIELD: corrosion inhibitor.

SUBSTANCE: invention is related to a composition for inhibiting corrosion containing a compound or its salt of formula (I), an acid and a polar aprotic solvent, which can be used for inhibiting corrosion of a metal surface in contact with an aqueous system and for providing improved protection of metals against corrosion in the specified aqueous system. In formula (I), X independently represents hydrogen, halogen or an unsubstituted C_1-5 alkyl group; m is 1, 2, 3 or 4; R¹ is hydrogen; R² is absent; R³ represents a bond or CHR⁴; R⁴ is OR⁵; R⁵ represents hydrogen; Z independently represents nitrogen or CX. In this case, the concentration of a compound or salt of formula (I) in the composition ranges from 1 to 50 wt.%; the acid concentration in the composition is from 5 to 60 wt.% and the polar aprotic solvent concentration in the composition is from 0.001 to 30 wt.%. The invention is also related to a method for inhibiting corrosion, including adding the specified composition, and a composition for inhibiting corrosion containing a compound of formula (I), an acid and a sulpholane.
EFFECT: corrosion inhibiting composition and method are proposed.

13 cl, 2 tbl, 6 ex