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High-Frequency-Induced Cathodic Breakdown during Plasma Electrolytic Oxidation

Nominé, A.; Nominé, A.V.; Braithwaite, N. St.J; Belmonte, T. and Henrion, G. (2017). High-Frequency-Induced Cathodic Breakdown during Plasma Electrolytic Oxidation. Physical Review Applied, 8(3), article no. 031001.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1103/PhysRevApplied.8.031001
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Abstract

The present communication shows the possibility of observing microdischarges under cathodic polarization during plasma electrolytic oxidation at high frequency. Cathodic microdischarges can ignite beyond a threshold frequency found close to 2 kHz. The presence (respectively, absence) of an electrical double layer is put forward to explain how the applied voltage can be screened, which therefore prevents (respectively, promotes) the ignition of a discharge. Interestingly, in the conditions of the present study, the electrical double layer requires between 175 and 260 μs to form. This situates the expected threshold frequency between 1.92 and 2.86 kHz, which is in good agreement with the value obtained experimentally.

Item Type: Journal Item
Copyright Holders: 2017 American Physical Society
ISSN: 2331-7019
Keywords: PEO coatings; aluminium; magnesium; titanium; alloy; optimization; parameters; discharges; growth
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Physics
Item ID: 51121
Depositing User: Lisa Robinson
Date Deposited: 24 Oct 2017 13:50
Last Modified: 03 May 2019 22:01
URI: http://oro.open.ac.uk/id/eprint/51121
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