J Mater Sci Technol ›› 2012, Vol. 28 ›› Issue (8): 707-712.

• Thin Film and Coaatings • Previous Articles     Next Articles

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

Wei Yang1), Bailing Jiang2), Aiying Wang1), Huiying Shi2)   

  1. 1) Ningbo Key Laboratory of Marine Protection 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
  • Received:2011-05-31 Revised:2011-12-02 Online:2012-08-31 Published:2012-08-30
  • Contact: Aiying Wang
  • Supported by:

    the National Natural Science Foundation of China (No. 51201176), Ningbo Municipal Nature Science Foundation (No. 201101A6105005) and Director Foundation of Ningbo Institute of Materials Technology and Engineering (No. Y10317QF09)

Abstract:

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 Al 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.

Key words: Aluminium alloy, Microarc oxidation, Incipient film, Ceramic coating, Negatively charged ions