The aqueous chemistry of molybdates is rather complex and several forms of poly-and monomolybdates are present in aqueous solutions depending on their pH . Due to the processes of the alloys' corrosion described by Eq. , the pH in the near electrode area is alkaline. Therefore, mostly monomolybdates will be present in the solution . As supported by the g-DEIS data (Fig. ), the first stage in the corrosion inhibition mechanism is the adsorption of molybdate on the surface of AZ31-xLi alloys. The adsorption preferably occurs on the active areas of the surface. However, it is mostly uniform with time and after 24 h of corrosion, almost the whole surface of all alloys was covered with a Mo-rich layer (Fig. ).