Effect of anodic inhibitors on corrosion of carbon steel bar reinforced concrete

The effect of a mixture of anodic inhibitors used to mitigate the corrosion rate of steel embedded in concrete caused by chloride ion has presented. For this purpose, two different ratio combinations of Calcium Nitrite and Sodium Molybdate were employed to study their functions and synergistic effects. For corrosion accelerating of steel, different amounts of Sodium Chloride were added to the designed solution and samples were exposed to wet and dry cycles for one, two and six months. Three electrochemical methods including linear polarization, impedance spectroscopy and cyclic potentiodynamic polarization were used to evaluate inhibitor behavior on the corrosion rate of steel embedded in concrete. Inherent permeability, compression strength, four-pin electrical resistance, and pH measurement tests have been done to study the effect of inhibitors on the mechanical properties of concrete. It was observed that the mixture of Calcium Nitrite and Sodium Molybdate improved inhibition corrosion of steel embedded in concrete and improving concrete mechanical properties as well.