Assessing the efficacy of IFKhAN-80 as a migrating corrosion inhibitor for reinforcing steel in new and chloride-contaminated concrete via polarization resistance method

• N.L. Cao¹, D.S. Shevtsov², T.M.H. Le¹, V.C. Nguyen¹, D.A. Nguyen¹, V.K. Dong¹, V.T. Tran¹, I.V. Avetisyan² and I.D. Zartsyn²

¹ Coastal Branch, the Joint Vietnam-Russia Tropical Science and Technology Research Center, 30 Nguyen Thien Thuat, Nha Trang, Vietnam
² Faculty of Chemistry, Voronezh State University, Universitetskaya pl. 1, Voronezh, 394018, Russian Federation

Abstract: A quantitative assessment of the efficacy of IFKhAN-80 as a migrating corrosion inhibitor (secondary protection) for steel reinforcement in mortar was carried out using the polarization resistance method. The applied technique, combined with F. Mansfeld’s calculation procedure, differentiates between the passive state and localized activation of steel reinforcement, enabling the evaluation of corrosion rates in fine-grained concrete samples, including those treated with the migrating corrosion inhibitor. The results align with data from standardized assessment methods, such as half-cell potential, specific electrical resistivity, and surface analysis of rebar. The high protective properties of IFKhAN-80 were confirmed under laboratory conditions over 320 days of periodic immersion in a 3% NaCl solution designed to induce localized corrosion activation. The inhibitor’s efficiency was 83.9% for “new” mortar compared to control samples without the inhibitor. The efficiency reached 87.5% for chloride-contaminated concrete, simulating conditions like seawater mixing or the exposure of reinforced concrete structures to marine environments. The findings showed that IFKhAN-80 treatment does not impact specific electrical resistivity. The protective mechanism of the studied inhibitor in mortar is thus hypothesized to involve reducing the rate of partial electrode reactions and/or the critical chloride concentration rather than altering the capillary-pore system properties like hydrophobization or densification.

Keywords: migrating corrosion inhibitor, IFKhAN-80, pitting corrosion, reinforcing steel, concrete

Int. J. Corros. Scale Inhib., 2024, 13, no. 4, 2007-2021
doi: 10.17675/2305-6894-2024-13-4-6

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