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Volume 6
Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212
Advanced Materials 2018
September 04-06, 2018
September 04-06, 2018 | Zürich, Switzerland
21
st
International Conference on
Advanced Materials & Nanotechnology
Effect of voltage on micro arc oxidation of 6061-Al alloy
Qingjun Zhu, Binbin Wang
and
Baorong Hou
Chinese Academy of Sciences, China
T
he ceramic film on 6061-Al alloy was prepared by micro arc oxidation (MAO). Effect of voltage on the microstructure and
corrosion resistance of MAO coatings were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD),
electrochemistry impedance spectroscopy (EIS) and a coating thickness tester. The results showed that the surface morphology
of MAO coating on 6061 aluminum alloys is porous volcano-like microstructures. The ceramic coatings are mainly composed
with the phase of γ-Al
2
O
3
and slight α-Al
2
O
3
. Mullite phase (3Al
2
O
3
•2SiO
2
) appeases when the value of voltage is 500V. With
the voltage increasing, the coating thickness and the size of discharge channels increased. The micro cracks will appear at 500V.
However, the number of discharge channels and corrosion resistance increased at first and then decreased with the increasing
of voltage. Accordingly, when the value of voltage is 450V, the corrosion resistance of the coating showed enhanced properties.
zhuqingjun@qdio.ac.cnRes. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C3-021