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Master Thesis

Influences de l’état de surface et du vieillissement du bain sur le procédé d’oxydation par plasma électrolytique

Abstract : Plasma Electrolytic Oxidation (PEO) both applies to a group of metals and its alloys (Al, Mg, Ti, Zn, Nb, Ta, Hf, W, Sb, Mo, Bi). The workpiece, immersed in an electrolyte, has been subjected to a current signal and to a strong electrical potential difference compare to a conventional anodization. After few seconds, some electrical shocks or micro arcs are formed around the workpiece. These electrical breakdown mechanisms allow the crystal structured oxide layer to grow up. These thicknesses obtained (from 1μm to 100μm) are much higher than the ones obtained by a conventional anodization. According to this study, especially the one realized on the aluminium alloy 2214, the surface condition would not have any significant influence on the process. However, we have observed an ageing electrolyte based on sodium silicate and potassium hydroxide. These results open up new possibilities for further discussions about the PEOs’ physico-chemical phenomena: It would exist, among other things, a molecular sieve formed from the beginning of the treatment. This filter would make possible a new model of electric shocks formation and oxide film growth.
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Master Thesis
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Philippe Leone. Influences de l’état de surface et du vieillissement du bain sur le procédé d’oxydation par plasma électrolytique. Matériaux. 2013. ⟨dumas-01243228⟩

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