The high purity aluminum samples were heated at different temperature for o
ne hour to produce different thickness of oxide films. The samples with and
without heat treatment were experimented by using Quasi-stationary method
in different amino acids solutions. The effects of different thickness of t
he oxide films on the rate of corrosion in aspartic acid were studied. The
pure amino acids solutions have pitting corrosion tendency toward the sampl
es. The effect of sodium chloride solution with respect to some amino acids
on the pitting corrosion was studied. The aggressivity order of the tested
solutions toward the samples are sodium chloride > aspartic acid > glutami
c acid solution. The pits generated in aspartic and in glutamic acid soluti
ons were irregular deep and elongated shallow in shape respectively as comp
ared to irregular-shaped pits in sodium chloride solutions.