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 .

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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.

This paper continues a series of publications dedicated to lab assessment of efficiency of carbon dioxide corrosion inhibitors at the oilfield pipelines of West Siberia region. It reviews the results of tests performed on "rotating cylinder" and "rotating cage" facilities. The article reviews the effect of temperature, specimen surface condition, flow velocity, presence of a hydrocarbon phase and inhibitor concentration on corrosion rate and protective properties of a wide range of commercial inhibitors. Recommendations on specific inhibitor test conditions are given to assess their applicability for protection of water lines, oil pipelines with low watercut and oil pipelines with high product watercut. Key words: corrosion inhibitors, test methods, oilfield pipelines.Received: September 1, 2013. doi: 10.17675/2305-6894-2013-2-4-287-303 Previously [1 -3], the specifics of tests in glass U-cell, flow-through recirculation loop, and bubble method have been studied to assess the efficiency of carbon dioxide corrosion inhibitors. This paper reviews the potential of another two methods for inhibitor testing that according to [4 -9] are quite accurate in simulation of the corrosion scenario in oilfield pipelines, namely, the rotating cylindrical electrode and rotating cage methods. The potential of these methods was analyzed by the example of the same inhibitors as in the previous articles [1 -3], so the numeration of the inhibitors accepted there is kept unchanged. Inhibitors No. 3, 4 and 7 are qualified by the manufacturers as imidazolines and No. 5 is a quaternary ammonium base. Inhibitor No.1 is a mixture of quaternary ammonium bases and imidazoline derivatives. Inhibitors No. 2 and 6 are amines. ExperimentalThe rotating cylindrical electrode method involves measuring the corrosion rates (K) of a steel cylinder rotating at a certain rate in corrosive liquid media placed in an air-tight electrochemical cell. The K values were estimated on the basis of specimen mass loss and by the polarization curve method [10]. At least five parallel experiments were made in each test fluid.