Fig. 1. Voltage-time graph for the processes of Plasma Electrolytic Oxidation.
Fig. 2. Schematic diagram of PEO process equipment.
Fig. 3. Equipment used for wear resistance test ; (a) controller, (b) wear resistance test machine.
Fig. 4. SEM micrographs of oxide films formed on Al alloy ; (a) 400V-5min, (b) 400V-15min, (c) 400V-20min, (d) 450V-5min, (e) 450V-15min, (f) 450V-20min, (g) 500V-5min, (h) 500V-15min, (i) 500V-20min.
Fig. 5. EDS mapping analysis for surface of oxide film.
Fig. 6. EDS mapping analysis for cross-section of oxide film.
Fig. 7. Relative specific wear rate by experimental condition.
Table 1. Chemical composition of Al alloy.
Table 2. Average thickness of the oxide films formed on Al alloy.
Table 3. Result of surface roughness test on specimens.
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