Abstract:The corrosion behaviors of 1420Al-Li alloy under 4 μl MgCl2 solution drops with initial concen-tration of 0 .1~1 .0mol/L were studied using a kelvin probe .The results showed that the filiform corro-sion mainly occurred when adding the MgCl2 drops with initial 0 .1mol/L and 0 .3mol/L concentration ,and the Volta potential baseline was at the range of -0 .7 to -0 .8 VSHE .The electric potential increased sud-dently and then decreased immediately ,which could be associated with the filiform corrosion growth stop and initiation .In the case of 1 .0mol/L initial concentration ,the meta-stable pitting corrosion mostly ap-peared ,and the electric potential exhibitted a sudden decrease and then immediate recovery ,which was as-sociated with the initiation and re-passivation of meta-stable pits .After the MgCl2 droplets reached the en-vironmental relative humidity , the cathodic limiting current associated with oxygen reduction was de-creased with increasing the initial MgCl2 concentration and the corrosion rate was decreased .
