Fig. 1: SVET maps of AA2024 in NaCl.

SVET maps recorded over AA2024 during immersion in 10 mM NaCl at selected exposure times: a 1 min, b 30 min, c 6 h and d 12 h. Areas of positive (anodic) and negative (cathodic) ionic current densities are given according to the colour scale bars from red to blue, respectively. Some pits (denoted by the red colour of high anodic current densities) tend to disappear at longer immersion time.