FIELD: protection of metals from corrosion by means of inhibitors, particular, acid corrosion inhibitor; applicable in oil, machine building, chemical and other industries for protection of steel equipment operating in acid media. SUBSTANCE: acid corrosion inhibitor contains still bottoms of production of aniline or n-phenetidine or santoquine and additionally hydrophylic organic solvent with the following amounts of components, mas.%: still bottoms of production of aniline or n-phenetidine or santoquine, 5.0-30.0; hydrophylic organic solvent, the balance. EFFECT: higher inhibiting properties for a long period of time in various acid media with acid content up to 30%. 1 tbl
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