ON THE MECHANISM OF INHIBITING THE HYDROGEN-SULFIDE CORROSION OF STEEL BY PHOSPHORYLATED ORTHOMETHYLAMINOPHENOLS

With electron microscopy and IR-spectroscopy methods, it is shown that such inhibitors of hydrogen sulfide corrosion of steel as phosphorila ted orthomethylaminophenols manifest themselves with respect to iron i ons (II) as polydentant ligands. Coordination of the inhibitor on the metal surface is determined by long-chain hydrocarbon radicals connect ed to the phenyl ring and to the phosphoril phosphorus atom. Chemical bonding of the protective inhibitor film to the steel surface guarante es 95-98% protection of the metal against hydrogen sulfide corrosion.