The effects of current density on the phase composition and microstructure properties of micro-arc oxidation coating

Yang, G., Lü, X., Bai, Y., Cui, H. and Jin, Z. (2002) The effects of current density on the phase composition and microstructure properties of micro-arc oxidation coating. Journal of Alloys and Compounds, 345(1-2), pp. 196-200. (doi:10.1016/S0925-8388(02)00289-X)

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Publisher's URL: http://dx.doi.org/10.1016/S0925-8388(02)00289-X

Abstract

Ceramic coatings have been synthesized on the Al alloy substrate by micro-arc oxidation (MAO) technique. The effects of current density on the mechanical and chemical properties of MAO coatings have been studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDX), and micro-hardness test. The samples fabricated at high current density consist mainly of α-Al2O3, while the samples fabricated at low current density are almost composed of γ-Al2O3. XRD analysis at different depths from coating surface towards substrate indicates that there is a complicated variation of α-Al2O3 content as a function of depth, which is different from the results of others. Micro-hardness test shows that these kinds of samples have high hardness. However, in the plane parallel to the substrate, there is a non-uniform distribution of hardness for the samples deposited at high current density, which can be attributed to the non-uniform distribution of pores in the same plane parallel to the substrate.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Yang, Dr Guangliang
Authors: Yang, G., Lü, X., Bai, Y., Cui, H., and Jin, Z.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Alloys and Compounds
Publisher:Elsevier
ISSN:0925-8388
ISSN (Online):1873-4669

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