| dc.description.abstract | The aim of the study is to investigate the effect of the anodic aluminum oxide film
(AAO film) formed on the 6063 aluminum alloy by using anodizing treatment. Through
the manufacturing process including annealing, artificial ageing treatment and
cold-rolling, the variation of AAO film of 6063 aluminum alloy revealed especially on
its microstructure, the angle of grain boundaries and the status of precipitate materials.
Furthermore, the anodizing was utilized to explore the influence on the AAO film from
the base structure. Also, voltage-time (V-t) curve in the process of anodizing was
recorded. After the above manufacturing process, the effect of the microstructure on the
growing behavior of the porous AAO film was observed by using SEM. In addition, the
SIMS was used to examine element the depth profiles of AAO film in the step 4 of V-t
curve. Then, the XPS was utilized to analyze the composition of AAO film surface in
the step 2 of V-t curve.
As the EBSD results indicated that the grain boundary was at medium/ high angle
present in O, O-T4-T6, O-rolling40%-T4-T6 specimens. In comparison, the main grain
boundary was low angle with O-T4-rolling40%-T6 specimen. Thus, the microstructure
of 6063 aluminum alloy significantly changed during the cold-rolling process. It
affected the Mg2Si precipitate particles, and the phase transformation occurred. In
respect to the variation of V-t curve, the voltage of the test fragment with cold-rolling
process became higher in the step 2. Moreover, the above test fragment consumed less
energy in the step 3. Concerning the cold-rolled 6063 aluminum alloy, therefore, it is
suggested that the decreasing of pore population, and increasing the pore diameter of the
AAO films.
As SIMS analysis, the distribution of Si ion reduced with depth of AAO film, and
AlOH was raised. Consequently, there were several findings from the XPS analysis as
III
following. In the O 1s analysis, the AAO film mainly contains of Al-O-H bonding phase,
Al(OH)3 hydrated oxide and several Al-O bonding phase. O-rolling40%-T4-T6 and
O-T4-rolling40%-T6 obtained higher Al-O bonding phase. Because of the dislocation
and hydrogen were produced in the Al matrix after the cold rolling process. Regarding
with the dimension of Si 2p, it was investigated that the main composition of AAO film
is Al2SiO5.
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