Effect of cathodic micro-discharges on oxide growth during plasma electrolytic oxidation (PEO) - Université de Lorraine Access content directly
Journal Articles Surface and Coatings Technology Year : 2015

Effect of cathodic micro-discharges on oxide growth during plasma electrolytic oxidation (PEO)

Alexandre Nominé,
J. Martin
Gérard Henrion
Thierry Belmonte

Abstract

Plasma electrolytic oxidation (PEO) of magnesium alloy is performed in NH4F and alkaline-silicate electrolytes within various waveforms of bipolar current pulses to investigate the role of the cathodic bias on both the growth mechanism of PEO layers and the behavior of micro-discharges. A particular attention is paid to cathodic micro-discharges and their ignition (or not) according to process conditions. Although cathodic micro-discharges have a detrimental effect on PEO layers, cathodic bias is necessary to improve the growth of oxide layers. Conditions that promote cathodic breakdown are discussed and a mechanism of layer cathodic breakdown is proposed. Cathodic micro-discharges, and to a greater extent the applied cathodic bias, influence the anodic breakdown coming immediately after, and therefore, the process behaviour during the anodic bias period
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Dates and versions

hal-03612228 , version 1 (06-02-2023)

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Attribution - NonCommercial - NoDerivatives

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Alexandre Nominé,, J. Martin, Gérard Henrion, Thierry Belmonte. Effect of cathodic micro-discharges on oxide growth during plasma electrolytic oxidation (PEO). Surface and Coatings Technology, 2015, 269, pp.131-137. ⟨10.1016/j.surfcoat.2015.01.076⟩. ⟨hal-03612228⟩
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