HYDROGEN SULFIDE CORROSION INHIBITOR OF STEEL Russian patent published in 2023 - IPC C23F11/14 C23F11/167 

FIELD: metal corrosion.

SUBSTANCE: protecting metals from corrosion using corrosion inhibitors. The use of N-(1,3-dimethylimidazolidin-2-ylidene)-5-phenyl-1,3,4-thiadiazol-2-amine, with the formula

as a corrosion inhibitor for St3 steel in the concentration range of 50-200 mg/l in a 0.1 M HCl solution in the presence of 250 mg/l hydrogen sulfide.

EFFECT: new heterocyclic compounds have been found that reduce the corrosion rate of low-carbon steel in contact with metal equipment from 1.1 mm/year in an uninhibited solution to 0.2-0.1 mm/year, depending on the concentration.

1 cl, 1 tbl, 2 ex