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HomeMaterials Science ForumMaterials Science Forum Vol. 814Effects of Current Density on the Properties of...

Effects of Current Density on the Properties of Microarc Oxidation Coatings Formed on Aluminum Alloy in Silicate-Na₂MoO₄ Electrolyte

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Abstract:

Microarc oxidation (MAO) coatings on ZL108 aluminum alloy were prepared in the silicate-Na₂MoO₄ electrolytes with different current density. The MAO process was studied by measuring the voltage as a function of time. The microstructure, compositions, distribution of element and corrosion resistance of the MAO coatings were investigated by SEM, XRD, EDS, XPS and polarization curve, respectively. With the increasing of current density, the final voltage in the microarc discharge process increased. The results shown that the MAO coatings were mainly composed of mullite, γ-Al₂O₃, Si, little MoO₂ and MoO₃. The micropore size, thickness, compositions, distribution of element of the MAO coatings depended on the current density and the amount of MoO₂ and MoO₃. The corrosion resistance improved as the porosity of the MAO coatings decreasing.

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Energy and Environmental Materials II

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Periodical:

Materials Science Forum (Volume 814)

Pages:

398-403

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.814.398

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Online since:

March 2015

Authors:

Ping Wang*, Ting Wu, Xiao Yang Guo, Ya Peng

Keywords:

Aluminium Alloy, Corrosion, Current Density, Microarc Oxidation, Microstructure

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