The principle aim of the present study is to produce
Plasma Electrolytic Oxidation (PEO) coating on aluminum via unipolar pulsed
current system and to indicate that it is possible to attain the similar
bipolar system results reported in the literature. A brief comparison
was also made between unipolar deposit properties with those achieved
via direct current (duty cycle 100%) system. In the present study, a hard
ceramic layer was produced on aluminum by PEO method under unipolar pulsed
current system. The results showed that unipolar pulsed current system
considerably improves oxide layer properties due to its better deposit
growth control as compared with direct current system. The mean hardness
value of the PEO coating was found to be 1700 Vickers.
N. Parvini Ahmadi, R.A. Khosroshahi and B. Baghal Asl, 2009. Deposition of Oxide Layer on Aluminium Via Plasma Electrolysis Method in Alkali Solutions by Unipolar Pulsed Current System and Study of its Physical Properties. Asian Journal of Applied Sciences, 2: 74-82.