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无机材料学报

无机材料学报

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铝合金表面氧化锆等离子体电解氧化涂层的制备及形成机理研究

辛世刚，赵荣根，都 徽，宋力昕   

  1. 中国科学院上海硅酸盐研究所特种无机涂层重点实验室，上海 200050
  • 收稿日期:2008-03-31 修回日期:2008-05-22 出版日期:2009-01-20 网络出版日期:2009-01-20

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

XIN Shi-Gang, ZHAO Rong-Gen, DU Hui, SONG Li-Xin   

  1. Key Laborary of Special Inorganic Coatings, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
  • Received:2008-03-31 Revised:2008-05-22 Published:2009-01-20 Online:2009-01-20

PDF (PC)

1952

被引次数

18 | 7

摘要： 采用等离子体电解氧化方法在铝合金表面制备了氧化锆涂层，电解液为包含Zr(OH)4颗粒的碱性溶液. 涂层的组成、结构通过XRD、EPMA进行了研究. 结果显示，涂层主要由t-ZrO2、m-ZrO2、α-Al2O3和γ-Al2O3组成，t-ZrO2为涂层的主晶相，分布在涂层表面，而α-Al2O3出现在涂层的内侧.涂层表面呈颗粒状，颗粒尺寸约为1~2μm.在氧化过程中，Zr(OH)4颗粒在电场力的作用下向等离子体放电通道口沉积，在放电产生的高温作用下直接转化为氧化锆.

关键词: 氧化锆；涂层；等离子体电解氧化；铝合金

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

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