The corrosion of steel is often a major cause of deterioration of concrete in reinforced concrete structures exposed to seawater. The corrosion of steel in concrete is an electrochemical process that occurs when there is a potential difference between two points on the armature, forming an electrolytic cell in which the anode and cathode are connected through the water in the pores of hydrated cement paste. Electrochemical tests electrochemical impedance spectroscopy (EIS), galvanostatic pulse and linear polarization resistance (LPR), were performed on a flat three-electrode cell, the chloride concentration ranging between 0.5 and 3.5% by weight of a concrete pore solution, two graphite counter-electrodes, a working electrode (steel) and a calomel reference electrode saturated were used. By analyzing results, it was observed the direct influence of the concentration of chloride on steel depasivation whose critical concentration was 2.5%. Finally, an analysis of the relationship between different techniques for the analysis of corrosion of reinforcing bars in pore solution was discussed.