Among them, magnesium-lithium (Mg-Li) alloys are the lightest metal engineering materials . According to the binary phase diagram of the Mg-Li system , alloying of magnesium with lithium improves the ductility of the alloy due to the transformation of the crystal structure from a hexagonal close-packed (hcp) with a lithium content of less than 5.7 wt.% (α-phase is a solid solution of lithium in magnesium) to body-centered cubic (bcc) with a Li content of more than 11.3 wt.% (β-phase, a solid solution of magnesium in lithium). In turn, magnesium alloys containing 5.7-11.3 wt.% of Li have both hcp and bcc crystal structures . Due to the simultaneous presence of the α-and β-phases, such magnesium alloys are characterized by medium strength and high ductility . This difference in the microstructure of the alloys has a significant influence on the corrosion rate of Mg-Li alloys. Xu et al. and Li et al. reported that Mg-Li alloys containing high amounts of Li (above 10.3 wt.%) have superior corrosion resistance due to the formation of a protective lithium carbonate surface film upon bcc Mg-Li matrix. However, Zhao et al. for Mg-4Li and Mg-12Li alloys reported opposite corrosion behavior and increased corrosion rates.