Research Paper

Prepare and Formation Mechanism of the Zirconia Coating on Aluminium Alloy by Plasma Electrolytic Oxidation

  • XIN Shi-Gang
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  • Key Laborary of Special Inorganic Coatings, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

Received date: 2008-03-31

  Revised date: 2008-05-22

  Online published: 2009-01-20

Abstract

Zirconia coating was produced on aluminium alloy by plasma electrolytic oxidation (PEO). The alkaline electrolyte containing Zr(OH)4 powders was used. The composition and structure of the coating were investigated by XRD, EPMA. The results show that the coating consists of t-ZrO2, m-ZrO2, α-Al2O3 and γ-Al2O3. t-ZrO2 is the main phase and distributes in outer layer of the coating, however, α-Al2O3 appears in inner layer of the coating. Many micro-particles appear on the coating surface with dimension of 1-2μm. In the process of plasma electrolytic oxidation, Zr(OH)4 powders move and deposite on the mouth of plasma discharge channel under the effect of electric field force, then it is transformed to ZrO2 by the high temperature of plasma discharge.

Cite this article

XIN Shi-Gang . Prepare and Formation Mechanism of the Zirconia Coating on Aluminium Alloy by Plasma Electrolytic Oxidation[J]. Journal of Inorganic Materials, 2009 , 24(1) : 107 -110 . DOI: 10.3724/SP.J.1077.2009.00107

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