Análise da viabilidade do uso de Benzoato e Molibdato como inibidores de corrosão em estruturas de concreto armado

Abstract

structures, many researches have sought solutions that mitigate the pathologies in the reinforcement, originating from corrosive processes. In this work the effect of the inclusion of sodium benzoate (NaC6H5CO2) and sodium molybdate (Na2MoO4) on the concrete matrix was evaluated. In this sense, the non-destructive electrochemical impedance spectroscopy technique provides a good monitoring of the concrete / saturated electrolyte and reinforced concrete / concrete interfaces. An increase in strength values at the reinforcement / concrete interface is clearly observed when the reinforced concrete structures are immersed in 3.5% NaCl solution in the presence of the benzoate and sodium molybdate inhibitors. This increase in strength is possibly attributed to the adsorption of the benzoate (C6H5CO2-) and molybdate (MoO4-2) anions on the AC 50 steel bar. The adsorption process of the inhibitors on the AC 50 steel bar provides not only a barrier effect against corrosive processes as well as increases the life of the armature.