An anodic dissolution test in NaCl solution, electrochemical polarization measurements and a corrosion test in AlCl
3 solution were carried out. The order of corrosion potential after pit growth is; high purity aluminum< Al-Mg<aluminum<Al-Mn. The order qualititatively agrees with that in AlCl
3 solution. Active dissolution types of electrochemical polarization characteristics are observed in AlCl
3 solution. Corrosion rates estimated from polarization curves coincide with those from an immersion test. Corrosion potentials, E
corr, on pitted materials are explained on the bases of anodic polarization characteristics in AlCl
3 and cathodic polarization characteristics in NaCl solutions. Change of E
corr value with pit growth can be understood considering expansion of local anode area.
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