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http://dx.doi.org/10.3740/MRSK.2008.18.5.241

Characteristics of Plasma Electrolytic Oxide Coatings on Mg-Al Alloy with Coating Time  

Lee, Du-Hyung (Department of Materials Engineering, Korea Aerospace University)
Kim, Bo-Sik (Department of Materials Engineering, Korea Aerospace University)
Chang, Si-Young (Department of Materials Engineering, Korea Aerospace University)
Publication Information
Korean Journal of Materials Research / v.18, no.5, 2008 , pp. 241-246 More about this Journal
Abstract
Pure Mg and Mg-6wt.%Al alloy were coated by the plasma electrolytic oxidation with various coating times and the microstructural and mechanical characteristics of the coatings were investigated. The coatings on pure Mg and Mg-6wt.%Al alloy consisted of MgO and $Mg_2SiO_4$. The surface roughness and thickness of the coatings became larger as the coating time increased. The coatings on the Mg-6wt.%Al alloy were more uniform and thicker than those on pure Mg. The microhardness and friction coefficient of the coatings increased progressively as the coating time increased. In addition, the coatings on the Mg-6wt.%Al alloy compared to pure Mg showed improved microhardness and a better friction coefficient.
Keywords
Plasma electrolytic oxidation; Mg-Al alloy; thickness; microhardness; friction coefficient;
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