After 1000 s, the stabilized value of the pH in the absence of the inhibitor for the AZ31-4Li alloy was ca. 6.7 (decreased on 0.7). This behavior might indicate relatively high corrosion resistance of this alloy in the examined conditions. However, the value of the pH in this case might be also affected by relatively low activity of cathodic surface regions, the presence of naturally dissolved CO2 and stirring conditions . Oppositely, for the AZ31-8Li and AZ31-12Li alloys, pH increased and reached 7.5 and 8.1, respectively. In solutions containing the permanganate inhibitor, the value of the stabilized pH significantly depended on the concentration of KMnO4.