MIGRATING CORROSION INHIBITOR AGAINS PREMATURE FAILURE OF REINFORCED CONCRETE CAUSED BY PENETRATION OF AGGRESSIVE ENVIRONMENT

Most authors agreed that reinforcement corrosion is the most important causes of premature failure of reinforced concrete structure worldwide and generate a great research concern due to its effects on global economy. Inhibitors are added to concrete to improve its quality and integrity. In recent years the use of these inhibitors in producing high performance concrete has increased significantly as a result of aggressive environment. The report presents information related to corrosion protection method to extend the service life of reinforced concrete structures include amino alcohols accompanied with amino acid as migrate inhibitors. As (MCI) migration corrosion inhibitor was studied different concentrations of butanol-1 amin-2 refer 1g/L methionine. Such substances are selected in respect of their functional groups (aminic, carboxylic), electron-donor groups like aminic and alkylic groups, or electron-attractor groups (electrophile agents like carboxylic group and atoms with high electronegativity), as well as the effect of carbon-chain length. Materials under investigation are two types of low alloy carbon steel marked as: Steel 39, Steel 44 (usually applied to concrete as reinforcing bars). The corrosion media consists in sulfuric acid in presence of chloride ions, in form of NaCl (H2SO4 1M + Cl- 10-3M). Potentiodynamic polarization method is used for inhibitor efficiency testing. Potentiodymanic polarization measurements showed that the presence of MCI in concentration ratio 12g/L butanol-1 amin-2 with 1g/L methionine, referring the corrosion protection of steel 39 and steel 44, presents protection efficiency respectively 86.21% and 88.37% classified as very good for this extreme aggressive conditions.