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

doi:10.3724/SP.J.1077.2009.00107

Abstract

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.

Key words: zirconia, coating, plasma electrolytic oxidation, aluminium alloy

CLC Number:

TG174

XIN Shi-Gang,ZHAO Rong-Gen,DU Hui,SONG Li-Xin. Prepare and Formation Mechanism of the Zirconia Coating on Aluminium Alloy by Plasma Electrolytic Oxidation[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2009.00107.

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

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