Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry were used to study the corrosion of reinforcing steel in a simulated pore solution with and without additions of chloride ions (0.5 M KCl), and calcium magnesium acetate (CMA) (0.2 M). The latter is considered as a possible deicing agent. Under open-circuit conditions, the initial rest potential (E-r) shifted in the noble direction and the charge transfer resistance (R-ct) increased, but after a few clays E-r moved in the negative direction and simultaneously R-ct decreased, whereas the double layer capacitance (C-dl) and depression angle of the charge transfer semicircle increased. R-ct(-1) rose with increasing C-dl. The impedance and voltammetric measurements indicated that the addition of CMA to the simulated pore solution diminished the corrosion rate and increased the protectiveness of surface films.