A study about the corrosion behavior of reinforcement steel bars in alkali activated slag concrete is presented. The blast furnace slag was activated with sodium silicate at 5%, obtaining a material with good cementing properties. The concrete specimens were manufactured with this cement, after mixing with the aggregates were reinforced with ASTM A706 resistant-seism steel bars. The reinforced concrete specimens were immersed in chloride ions contaminated environments to simulate marine conditions. The metal electrochemical evaluation was accomplished with linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) techniques. Was determined the steel passive film behavior and the electrochemical metal behavior when are immersed in these ceramic innovative materials.