All solutions for corrosion studies were prepared with NaCl (≥99.5) and Na2MoO4 × 2H2O (≥99.5) received from Chemsolute (Th. Geyer Polska) using deionized water with a resistivity of 18.2 MΩ cm. As a reference corrosion medium, 0.05 M NaCl solution was selected. This concentration of salt prevents rapid degradation of Mg alloys and was previously used in our studies of inorganic corrosion inhibitors of Mg and Al alloys . The effectiveness of the molybdate inhibitor was examined in 0.05 M NaCl with the concentration of the inhibitor varying in the range of 10-150 mM.