Migrating corrosion inhibitor based on organic amines for protecting steel reinforcement in concrete

• M.A. Khvastin¹, V.F. Stepanova², N.N. Andreev³, K.Y. Usanova^4,5, A.O. Baranov⁴ and V.N. Kavkazskiy⁶

¹ MSS JSC, Vorontsovskaya st., 35, 109147 Moscow, Russian Federation
² Research Institute of Concrete and Reinforced Concrete (NIIZHB) named after A.A. Gvozdev, JSC Research Center of Construction, 2nd Institutskaya st. 6, 109428 Moscow, Russian Federation
³ A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr. 31, 119071 Moscow, Russian Federation
⁴ Peter the Great St. Petersburg Polytechnic University, Polytechnicheskaya, 29, 195251 St. Petersburg, Russian Federation
⁵ RUDN University, Miklukho-Maklaya str.6, 117198 Moscow, Russian Federation
⁶ Emperor Alexander I St. Petersburg State Transport University, Moskovsky pr. 9, 190031 St. Petersburg, Russian Federation

Abstract: The work aims to evaluate the efficiency of migrating corrosion inhibitor based on organic amines called HAENYTEX Protectoseal Ci in relation to steel reinforcement in concrete. Specimens of fine-grained concrete reinforced with steel rods with a diameter of 5 mm and a length of 120 mm were tested. During the manufacture of specimens, calcium chloride was introduced into the concrete composition in order to reduce the passivation effect of concrete. Three series of specimens were prepared: without inhibitor, with inhibitor applied to the specimens’ surface, with inhibitor applied to the specimens’ surface and moistening them with water. Determination of the passivation effect of concrete treated with the studied inhibitor in relation to steel reinforcement was carried out using an accelerated electrochemical method. The current density in specimens without migrating corrosion inhibitor increased by 26% and 196% after 90 days and 180 days of exposure to alternating wetting and drying on concrete, respectively, which indicates that corrosion is progressing. The inhibitor HAENYTEX Protectoseal Ci demonstrated the ability to provide a passive state of reinforcement in concrete. The current density for concrete specimens with the inhibitor applied to the surface was 9.66 μA/cm², 0.94 μA/cm² and 0.65 μA/cm² in the initial state, after 90 days and after 180 days of exposure to alternating wetting and drying on concrete.

Keywords: corrosion inhibitor, concrete, steel, corrosion resistance, calcium chloride, electrochemical tests

Int. J. Corros. Scale Inhib., 2024, 13, no. 3, 1702-1714
doi: 10.17675/2305-6894-2024-13-3-20

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