MIGRATION INHIBITORS FOR PREVENTIONS OF CORROSION OF REINFORCED CONCRETE CONSTRUCTIONS

Abstract

Corrosion undermines the physical integrity of structures and can lead to destruction of property and loss of life. Chloride-induced steel corrosion is one of the major worldwide deterioration problems for steel reinforced concrete structures. The use of green inhibitors in producing high performance concrete has increased significantly. The aim of our study was to investigate the efficiency of green inhibitor and migration inhibitor admixed in concrete. The concrete samples were exposed in aggressive media H₂SO₄ 1M and 10^-3 Cl^-. As corrosion inhibitor we have used locust bean gum as a green inhibitor and methionine+butanolamine as migration inhibitor. Half-cell potential, polarization resistance and Tafel extrapolation methods are used for inhibitor efficiency testing. The results show high resistance polarization and low corrosion rate for concrete sample with inhibitor. The corrosion rate decreases approximately 90% in presence of locust bean gum and 80% in presence of migration inhibitor.