NDLI: Influence of potential on structure and properties of microarc oxidation coating on Mg alloy

Content Provider	Springer Nature Link
Author	Deng, Shu hao Yi, Dan qing Gong, Zhu qing Su, Yu chang
Copyright Year	2005
Abstract	In order to obtain optimizing microarc oxidation coating on Mg alloy from a friendly-enviormental electrolyte free of Cr$^{6+}$ and PO 4 3− , constant potential regime was applied to produce it. The influence of potential on the morphology, composition, structure and other properties, such as microhardness and corrosion resistance were investigated by scanning electron microscopy (SEM), energy dispersive spectroscope (EDS), X-ray diffraction (XRD), hardness tester and electrochemical method. The results clearly show that oxidation potential plays an important role in the formation of coating’s structure and properties. The microarc oxidation coating is smooth and white, which consists of two layers. The external layer is loose and porous and enriched in Al and Si. Moreover, its content of Al and Si increases with the increasing operated potential. While the inner layer is compact and the content of Al and Si are lower than that of the external layer. The coating is composed of several phases and the major phases are MgAl$_{2}$O$_{4}$ and MgO, and the minor phases are Al$_{2}$O$_{3}$ and SiO$_{2}$ when the potential is higher. The microhardness of coating is obtained the maximum at the potential of 45 V, so does the corrosion resistance.
Starting Page	12
Ending Page	17
Page Count	6
File Format	PDF
ISSN	10059784
Journal	Journal of Central South University of Technology
Volume Number	12
Issue Number	1
e-ISSN	19930666
Language	English
Publisher	Central South University of Technology
Publisher Date	2005-01-01
Publisher Place	Changsha
Access Restriction	Subscribed
Subject Keyword	microarc oxidation magnesium alloy structure property Engineering Metallic Materials
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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