PROTECTIVE PERFORMANCE OF THE MIGRATING CORROSION INHIBITOR MCI-VN FOR STEEL REINFORCEMENT IN CONCRETE PORE SOLUTION

: A blended corrosion inhibitor (MCI-VN) based on a synergistic combination of inorganic and organic salts with a nonionic surfactant is proposed to protect steel reinforcement in concrete under chloride exposure. The composition is suitable for use as an admixture in the production of new reinforced concrete structures or repair mortars, as well as for surface application to existing structures (migrating corrosion inhibitor). This study evaluates the anti-corrosion properties of the inhibitor in the concrete pore solution. The assessment was performed using electrochemical methods (potentiodynamic polarization and impedance spectroscopy) and gravimetric analysis. As the inhibitor concentration (Cinh) increased in the 0.25-5.0 wt.% range, the inhibition efficiency rose to 92-97%, depending on the evaluation method. During 30-day gravimetric experiments, complete suppression of corrosion was observed at Cinh ≥ 2.0 wt.%. Comparison with the commercial inhibitor IFKhAN-80 showed comparable or superior protective performance under equivalent conditions. Therefore, MCI-VN can be considered an effective solution for improving the corrosion resistance of reinforced concrete structures in chloride-containing environments.