FIELD: corrosion protection. SUBSTANCE: invention focuses on protecting steel equipment affected by corrosive media close to neutral ones. Complex inhibitor is added to working medium with following concentrations of its components in medium, g/cu.dm: sodium nitrite 50-100, water-soluble urea-formaldehyde resin 10-20, orthophosphoric acid 10-20. At these concentrations, observed corrosion rate is less than 0.005 mm/year and protection effect exceeds 95%. EFFECT: increased anticorrosive characteristics of steal with relatively low concentrations of low-toxicity reagents. 3 cl, 1 tbl
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