Preparation Al<sub>2sub>O<sub>3sub>/ZrO<sub>2sub> composite coating in an alkaline phosphate electrolyte containing K<sub>2sub>ZrF<sub>6sub> on aluminum alloy by microarc oxidation
- 作者：Mingqi Tang<sup>asup><sup> ; sup><sup>bsup><sup> ; sup><sup>tangmq400@163.comsup> ; Weiping Li<sup>asup> ; Huicong Liu<sup>asup> ; Liqun Zhu<sup>asup><sup> ; sup><sup>zhulq@buaa.edu.cnsup>
- 关键词：Aluminum alloy ; Microarc oxidation ; Composite coating ; Zirconia
- 刊名：Applied Surface Science
- 出版年：2012
- 期刊代码：6_01694332
- 类别：ms
- 出版时间：15 May, 2012
- 卷：258
- 期：15
- 页码：5869-5875
- 文件大小：1378 K
摘要
Al<sub>2sub>O<sub>3sub>/ZrO<sub>2sub> composite coating was prepared on 2A70 aluminum alloy by microarc oxidation (MAO) in a phosphate electrolyte containing K<sub>2sub>ZrF<sub>6sub>. The effects of K<sub>2sub>ZrF<sub>6sub> in the electrolyte on the coating thickness, surface morphology, elemental composition and abrasive resistance were investigated. The results indicated that the MAO coating thickness increase due to the addition of K<sub>2sub>ZrF<sub>6sub> in the electrolyte. In the electrolyte containing 6.0 g/L K<sub>2sub>ZrF<sub>6sub>, the coating was the most uniform and compact. The MAO coating formed in the electrolyte without K<sub>2sub>ZrF<sub>6sub> was mainly composed of 纬-Al<sub>2sub>O<sub>3sub> and a little 伪-Al<sub>2sub>O<sub>3sub>. Zirconium in the form of t-ZrO<sub>2sub> was detected in the MAO coatings formed in the electrolyte containing K<sub>2sub>ZrF<sub>6sub>, and the Zr content increases with increasing concentration of K<sub>2sub>ZrF<sub>6sub>. A 纬-Al<sub>2sub>O<sub>3sub> and t-ZrO<sub>2sub> nanocomposite coating was formed in the electrolyte containing 6.0 g/L K<sub>2sub>ZrF<sub>6sub>, and which exhibited the highest abrasive resistance.