EFFECT OF GRAPHITE ADDITIVES IN ELECTROLYTES ON CHARACTERISTICS OF MICRO-ARC OXIDATION COATINGS ON 7E04 ALUMINUM ALLOY

Ping Wang, Jun Pu, You Tao Xiao, Wen Jun Hu, Ting Wu, Wen Jie Cao, Ze Yu Gong and Ming Huang
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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

Surface Review and Letters (SRL), 2019, vol. 26, issue 04, 1-9

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.

Keywords: Aluminum drill pipes; graphite powder; micro-arc oxidation; mechanism; performance (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1142/S0218625X18501780

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