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http://dx.doi.org/10.3365/KJMM.2011.49.8.601

Influence of Current Density on Corrosion Properties of AZ91 Mg Alloy Coated by Plasma Electrolytic Oxidation Method  

Lee, Byung Uk (Department of Metallurgy and Materials Engineering, Hanyang University)
Hwang, In Jun (Department of Metallurgy and Materials Engineering, Hanyang University)
Lee, Jae Sik (School of Materials Science and Engineering, Yeungnam University)
Ko, Young Gun (School of Materials Science and Engineering, Yeungnam University)
Shin, Dong Hyuk (Department of Metallurgy and Materials Engineering, Hanyang University)
Publication Information
Korean Journal of Metals and Materials / v.49, no.8, 2011 , pp. 601-607 More about this Journal
Abstract
The study investigated the influence of current density on the corrosion-protection properties of an AZ91 Mg alloy subjected to plasma electrolytic oxidation coating. The present coatings were carried out under an AC condition at three different current densities, i.e., 100, 150, and $200mA/cm^2$. From microstructural observations, the micro cracks connecting each micro pore were pronounced on the oxide surface of the samples coated at current densities higher than $150mA/cm^2$ since increasing the current density in this study led to an increment in the relative volume fraction of the MgO compound. Based on potentio dynamic polarization and immersion tests, the sample coated at a current density of $100mA/cm^2$ showed superior corrosion resistance.
Keywords
Mg alloy; coating; plasma electrolytic oxidation; current density; corrosion;
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