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Effect Of Graphite Additives In Electrolytes On Characteristics Of Micro-Arc Oxidation Coatings On 7e04 Aluminum Alloy

Author

Listed:
  • PING WANG

    (College of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China)

  • JUN PU

    (College of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China)

  • YOU TAO XIAO

    (College of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China)

  • WEN JUN HU

    (College of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China)

  • TING WU

    (College of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China)

  • WEN JIE CAO

    (College of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China)

  • ZE YU GONG

    (College of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China)

  • MING HUANG

    (College of Materials Science and Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China)

Abstract

Micro-arc oxidation coatings were fabricated on 7E04 aluminum alloy substrates by micro-arc oxidation (MAO) in the electrolytes with the graphite addition varying from 0 to 8g/L (0, 2, 4, 6, 8g/L). The effect of graphite concentration on the surface morphologies, micro-hardness, thickness, phase composition and corrosion resistance of coatings was investigated. With the graphite powder concentration increasing, the oxidation voltage decreased gradually and the thickness of coatings firstly dropped down and then went up. It is found that the size of micro-pores and sintered discs declined with increase of graphite concentration. The XRD results indicated that MAO coatings mainly consisted of γ-Al2O3, θ-Al2O3, SiO2 and a little α-Al2O3. The corrosion resistance of coatings was improved with the addition of graphite powder. The study reveals that the appropriate graphite powder in the electrolytes is essential to promote the performance of the coatings.

Suggested Citation

  • Ping Wang & Jun Pu & You Tao Xiao & Wen Jun Hu & Ting Wu & Wen Jie Cao & Ze Yu Gong & Ming Huang, 2019. "Effect Of Graphite Additives In Electrolytes On Characteristics Of Micro-Arc Oxidation Coatings On 7e04 Aluminum Alloy," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 26(04), pages 1-9, May.
    • Handle: RePEc:wsi:srlxxx:v:26:y:2019:i:04:n:s0218625x18501780
    DOI: 10.1142/S0218625X18501780
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