Journal
SURFACE & COATINGS TECHNOLOGY
Volume 177, Issue -, Pages 779-783Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2003.06.020
Keywords
plasma electrolytic oxidation; microdischarge; real time imaging
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This paper reports the first results of microdischarge studies performed using real time imaging of the plasma electrolytic oxidation process. It is shown that small microdischarges with a cross-sectional area of approximately 0.02 mm, dominate throughout the oxidation process. With the oxide coating growth, the percentage of large (area 0.37 mm) and extra-large microdischarges (area >0.87 mm(2)) in the total microdischarge population increases from 0 to 8% and 4%, respectively, at the end point. At the same time the microdischarge current density falls from 50 to 18 kA m(-2), due to the increase in total testpiece area exposed to microdischarges from 3 to 6%. The microdischarge contribution to coating growth is evaluated to be in the range of 8-10 nm per a microdischarge event. (C) 2003 Elsevier Science B.V. All rights reserved.
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