The utilization of aluminum-lithium-magnesium (Al-Li-Mg) alloys in the transportation industry is enabled by excellent engineering properties. The mechanical properties and corrosion resistance are influenced by the microstructure development comprehending the solidification of coherent strengthening precipitates, precipitation of course and angular equilibrium phases as well as the formation and widening of the Precipitate-free zone. The research was performed to determine the microstructure degradation of Al-2.18Mg-1.92Li alloy in a corrosive environment using electrochemical measurements. The solidification sequence of the Al-2.18Mg-1.92Li alloy, obtained using Thermo–Calc software support, indicated the transformation of the Al dendritic network and precipitation of AlLi (), Al2LiMg (T), and Al8Mg5 () phase. All of the phases are anodic with respect to the Al enabling microstructure degradation. To achieve higher microstructure stability, the sample was solution hardened at 520 C. However, the sample in as-cast condition showed a lower corrosion potential (􀀀749.84 mV) and corrosion rate (17.01 mm/year) with respect to the solution-hardened sample (􀀀752.52 mV, 51.24 mm/year). Higher microstructure degradation of the solution-hardened sample is a consequence of phase precipitation at the grain boundaries and inside the grain of Al, leading to intergranular corrosion and cavity formation. The phase precipitates from the Li and Mg enriched the Al solid solution at the solution-hardening temperature.