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Title: The evidence of cathodic micro-discharges during plasma electrolytic oxidation process
Author(s): A. Nominé, J. Martin, C. Noel, I. V. Bardin, V. L. Kovalev, T. Belmonte, A. G. Rakoch and G. Henrion
Journal: Applied Physics Letters
Year: 2014
Volume: 104
Pages: 081603
DOI: 10.1063/1.4866425
Abstract: Plasma electrolytic oxidation (PEO) processing of EV31 magnesium alloy has been carried out in fluoride containing electrolyte under bipolar pulse current regime. Unusual PEO cathodic microdischarges have been observed and investigated. It is shown that the cathodic micro-discharges exhibit a collective intermittent behavior, which is discussed in terms of charge accumulations at the layer/electrolyte and layer/metal interfaces. Optical emission spectroscopy is used to determine the electron density (typ. 1015cm_3) and the electron temperature (typ. 7500K) while the role of F_ anions on the appearance of cathodic micro-discharges is pointed out.
Note: Département CP2S : ESPRITS

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