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標題: Effects of addition of Al(NO3)(3) to electrolytes on alumina coatings by plasma electrolytic oxidation
作者: Hsu, C.H.
Teng, H.P.
Lu, F.H.
Project: Surface & Coatings Technology
期刊/報告no:: Surface & Coatings Technology, Volume 205, Issue 12, Page(s) 3677-3682.
Alumina coatings were prepared by plasma electrolytic oxidation (PEO) on Al alloys using NaAlO2 electrolytes with added Al(NO3)(3) to enhance the mechanical properties of the coatings. Electrolytes (0.1 M NaAlO2) with small amounts of Al(NO3)(3) ranging from 1.0 to 5.3 mM were employed at a fixed current density (10 A/dm(2)). With the added Al(NO3)(3), the onset of spark discharges was delayed, which is associated with the dissolution and oxidation of Al alloys in the nitrates. X-ray diffraction results showed that the obtained coatings consisted of both the alpha-Al2O3 and gamma-Al2O3 phases. The maximum alpha-Al2O3 content of the coatings was obtained with the addition of 1.6 mM Al(NO3)(3) to the electrolytes. The hardness of the coatings was significantly enhanced by increasing their alpha-Al2O3 content, which could be achieved by adding suitable amounts of Al(NO3)(3) to the electrolytes. (C) 2011 Elsevier B.V. All rights reserved.
ISSN: 0257-8972
DOI: 10.1016/j.surfcoat.2011.01.024
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