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| SPARK DISCHARGES DURING THE MICRO-ARCOXIDATION OF AZ91D MAGNESIUM ALLOYS |
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| 中科院海洋所 |
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Abstract Spark discharge is the representative phenomenon of micro-arc oxidati
on (MAO) method.Accompanied with the spark discharge,the cell voltage presents
oscillations within the range of several volts,and the surface morphologies,t
he element distribution as well as the surface potential distributions of the an
odic layer are significantly changed.It was found that spark discharges resulte
d in a great deal of discharge pores in the oxide layer,accelerated the oxidati
on and the deposition of electrolytic particles.Due to the melting effect of th
e sparks,compact internal layer was formed underneath the outer loose layer,an
d the surface potential over the spark zone was greatly enhanced.In addition,i
t was found that oxygen played a key role in determining the intensity and the s
ize of sparks,and abundant oxygen resulted in intensive and larger sparks.
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Received: 08 June 2005
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