METHOD OF SWEET IRON CORROSION INHIBITION Russian patent published in 2009 - IPC C23F11/04 

FIELD: chemistry.

SUBSTANCE: invention refers to sweet corrosion protection of metals and can be used, e.g. at oil-field and oil-refining works. Method involves introducing inhibitor into corrosive medium contacting to iron surface in concentration 0.1-25.0 mg/l. Herewith corrosion inhibitor is rhodanine and its 3- or 5-derivatives of general formula I or , where R₁₌R₂=R₃=H (I-1) R=(CH₃)₂C= (II-l) R₁=NH₂; R₂=R₃=H (I-2) R=H-C₅H_nCH= (II-2) R=CH₂CH=CH₂; R₂=R₃=H (I-3) R₁=H-C₄H₉; R₂=R₃=H (I-4) R₁=CH₂COOH; R₂=R₃=H (I-5) R₁=H, R₂=H, R₃=C₂H₅ (I-6).

EFFECT: ensured possibility to inhibit low-concentrated sweet iron corrosion.

3 cl, 1 dwg, 3 tbl, 5 ex