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Effects of Hydroxide and Silicate ions on the Plasma Electrolytic Oxidation of AZ31 Mg Alloy
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 Title & Authors
Effects of Hydroxide and Silicate ions on the Plasma Electrolytic Oxidation of AZ31 Mg Alloy
Moon, Sungmo; Yang, Cheolnam; Na, Sangjo;
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 Abstract
Formation behavior of PEO (Plasma Electrolytic Oxidation) films on AZ31 Mg alloy was studied in aqueous solutions containing various concentrations of hydroxide ion () and silicate ion () by voltage-time curves, and corrosion resistance of the PEO film-covered specimen was investigated by immersion test in 0.5 M NaCl solution. From the analyses of the voltage-time curves, it is suggested that two different types of anions are essentially needed for the formation of PEO films on AZ31 Mg alloy: film formation agent and local film breakdown agent. ion acts only as a film formation agent but ion acts not only as a film formation agent but also film breakdown agent. The PEO films prepared on AZ31 Mg alloy in alkaline silicate solution showed very good corrosion resistance without any pitting or filiform corrosions up to 480 h of immersion in 0.5 M NaCl.
 Keywords
Magnesium;Plasma electrolytic oxidation;corrosion;anodizing;
 Language
English
 Cited by
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한국표면공학회지, 2015. vol.48. 5, pp.194-198 crossref(new window)
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Anodic Oxide Films Formed on AZ31 Magnesium Alloy by Plasma Electrolytic Oxidation Method in Electrolytes Containing Various NaF Concentrations, Journal of the Korean institute of surface engineering, 2016, 49, 3, 225  crossref(new windwow)
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A Blade-Abrading Method for Surface Pretreatment of Mg Alloys, Journal of the Korean institute of surface engineering, 2015, 48, 5, 194  crossref(new windwow)
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Anodic Oxidation Behavior of AZ31 Magnesium Alloy in Aqueous Electrolyte Containing Various Na2CO3Concentrations, Journal of the Korean institute of surface engineering, 2016, 49, 4, 331  crossref(new windwow)
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Effects of NaOH Concentration on the Structure of PEO Films Formed on AZ31 Mg Alloy in PO43-and SiO32-Containing Aqueous Solution, Journal of the Korean institute of surface engineering, 2016, 49, 1, 46  crossref(new windwow)
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