Effect of Negatively Charged Ions on the Formation of Microarc Oxidation Coating on 2024 Aluminium Alloy

材料科学技术（英文）, 2012, 28(8): 707-712.

Effect of Negatively Charged Ions on the Formation of Microarc Oxidation Coating on 2024 Aluminium Alloy

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1.Ningbo Key Laboratory of Marine Protec＇tion Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

2.School of Materials Science and Engineering, Xi＇an University of Technology, Xi＇an 710048, China

3.Ningbo Key Laboratory of Marine Protec＇tion Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

4.School of Materials Science and Engineering, Xi＇an University of Technology, Xi＇an 710048, China

基金项目: Ningbo Mu- nicipal Nature Science Foundation(201101A6105005) Acknowledgements This work was supported by the National Natural Sci- ence Foundation of China(51201176) Director Foundation of Ningbo Institute of Materials Technology and Engineering(Y10317QF09)

关键词： 2024铝合金 , 微弧氧化膜 , 负电荷 , 陶瓷涂层 , 电弧放电 , 离子对 , MAO , 氧化涂层

Effect of Negatively Charged Ions on the Formation of Microarc Oxidation Coating on 2024 Aluminium Alloy

Keywords： Aluminium alloy , Microarc oxidation , Incipient film , Ceramic coating , Negativelycharged ions ,

The present study deals with the effect of negatively charged ions on the ceramic coating formation on 2024 aluminium alloy during microarc oxidation （MAO） process. On the basis of the experimental results, two steps （the formation of an incipient film without arc presence and the growth of a ceramic coating with arc discharge） of MAO process have been observed. For comparison, four different negatively charged ions studied. It is proved that negatively charged ions strongly participated in the formation of an incipient film with high impedance value at the first step. The growth of ceramic coating depends on the combination between AI of the substrate and O from the electrolyte, and the negatively charged ions are little consumed. As an anodic oxide coating is prepared on the sample surface instead of the incipient film, the first step occurs easily and the growth of ceramic coating is accelerated. Furthermore, the mechanism of negatively charged ions in the formation of the MAO coating has been proposed.

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材料期刊网

Effect of Negatively Charged Ions on the Formation of Microarc Oxidation Coating on 2024 Aluminium Alloy

Effect of Negatively Charged Ions on the Formation of Microarc Oxidation Coating on 2024 Aluminium Alloy

参考文献