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.

DOI: https://doi.org/10.1103/PhysRevApplied.8.031001

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.

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• Item ORO ID
• 51121
• Item Type
• Journal Item
• ISSN
• 2331-7019
• Keywords
• PEO coatings; aluminium; magnesium; titanium; alloy; optimization; parameters; discharges; growth
• Academic Unit or School
• Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
  Faculty of Science, Technology, Engineering and Mathematics (STEM)
• Research Group
• Physics
• Copyright Holders
• © 2017 American Physical Society
• Depositing User
• Lisa Robinson