The penetration of IFKhAN-80 migrating corrosion inhibitor into cement stone was studied. It was found that the depth of steel reinforcement protection in concrete containing 3% NaCl (with respect to the binder) depends on the inhibitor dosage and application method and can be up to 15-20 cm. For practical use, the consumption rate of IFKhAN-80 will depend on the reinforcement depth but should not be lower than 0.6 L/m 2 .

Environmental tests of the efficiency of IFKhAN-80, a corrosion inhibitor for steel reinforcement in concrete, have been carried out. It has been found that the electrochemical criteria for the estimation of the corrosion behavior of steel reinforcement in concrete recommended by GOST (RF State Standard) 31383-2008 are not informative under the test conditions used. In view of this, the effect of IFKhAN-80 on the kinetics of corrosion spot growth on steel surface has been analyzed. In the absence of an inhibitor, corrosion of reinforcement steel already occurs in the course of hardening of chloride-containing concrete. Once hardening is completed, the growth rate of corrosion spots decreases abruptly. The area of corroded surface remains unchanged for 6 months, then the growth of corrosion spots on the metal surface resumes. Addition of IFKhAN-80 with tempering water in amounts recommended by the developers slows down corrosion in the course of concrete hardening and during exposure under natural conditions. Application of IFKhAN-80 onto the surface of concrete samples in amounts recommended by the developers can arrest the growth of corrosion spots for a long time. Key words: corrosion inhibitors, migrating corrosion inhibitors, corrosion in concrete, reinforced concrete, IFKhAN-80.Received: August 7, 2016. Published: September 22, 2016. doi: 10.17675/2305-6894-2016 Corrosion inhibitors (both contact and migrating ones) are widely used for the protection of reinforced concrete structures [1][2][3][4][5][6][7]. Recently, a new corrosion inhibitor for concrete steel reinforcement was developed at the Institute of physical chemistry and electrochemistry of the Russian Academy of Sciences. It is called IFKhAN-80 and is positioned as a versatile formulation. It is a 30% aqueous solution of a non-volatile compound modified by addition of a surfactant. According to laboratory tests, IFKhAN-80 is efficient both when introduced into concrete with tempering water and when applied to a concrete surface.The purpose of this study was to estimate the efficiency of IFKhAN-80 under natural conditions.

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