This research evaluates the corrosion resistance of a galvanic steel bar embedded in an alkali-activated concrete. The non-destructive electrochemical techniques for measure of corrosion rates of steel bar embedded in concrete include linear polarization and impedance spectroscopy measurement. The work to be describe on this paper concerns the application of linear polarization to steel bar ASTM-A706 embedded at solution of NaCl de 3,5 wt. %, within alkali-activated concrete. The aim was to relate the response of variation of corrosion in the transition state from passive to active of the steel bar.