Typical time variation of the emission line intensity during the PEO process at different current modes.
Plasma temperature as a function of treatment time (min) determined from the intensity ratio of Al (396.1 nm)/Al (309.2 nm), for 8% .
(Color online) Schematic of the discharge models for the PEO process for an Al sample.
SEM micrograph of surface morphology of the coated Al sample, for 60 min treatment time at different current modes.
Cross-sectional micrographs of the oxide ceramic surface layers form for 60 min treatment time at different current modes.
Coating thickness, growth rate, and surface roughness for different current modes.
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