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Properties and Structure of PEO Treated Aluminum Alloy

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Abstract

Plasma electrolytic oxidation (PEO) coatings were formed on 7075 aluminum alloy in silicateborate based electrolyte with different duty cycles. The physical and chemical properties of the PEO coatings were thoroughly investigated. The wearing and corrosion properties of the coatings were evaluated by wearing experiments and potentiodynamic polarization tests, respectively. The results showed that the micro-hardness of the coatings first increased and then decreased with the increasing duty cycle. As a results, the wearing resistance of the coatings first increased and then decreased with the increasing duty cycle. Composition analysis proved that the coatings were mainly composed of α-Al2O3 and γ-Al2O3. The presence of wear scars on the worn surface morphology demonstrates that the three-body rolling was the main wear mechanism for coated specimen. The corrosion study showed that the coating formed in the mixed electrolyte with duty cycle of 80% showed the most superior corrosion resistance.

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Authors and Affiliations

  1. School of Mechanical Engineering, Nanjing Vocational University of Industry Technology, Nanjing, 210046, China

    Yuanji Shi  (施渊吉), Yanyan Wang, Bingyan Teng & Wei Li

  2. College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China

    Yuanji Shi  (施渊吉), Cheng Cheng & Xunzhong Guo  (郭训忠)

  3. School of Automotive Engineering, Changshu Institute of Technology, Suzhou, 215500, China

    Zhaopeng Yu

  4. School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, China

    Junwan Li

Authors
  1. Yuanji Shi  (施渊吉)
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  2. Yanyan Wang
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  3. Cheng Cheng
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  4. Xunzhong Guo  (郭训忠)
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  5. Bingyan Teng
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  6. Zhaopeng Yu
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  7. Junwan Li
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  8. Wei Li
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Corresponding author

Correspondence to Xunzhong Guo  (郭训忠).

Additional information

Funded by the National Natural Science Foundation of China (No. 11802117), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (No. 19KJB430024), the Science Foundation of the Jiangsu Industrial Software Engineering Research Center (No. ZK190401)

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Shi, Y., Wang, Y., Cheng, C. et al. Properties and Structure of PEO Treated Aluminum Alloy. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 36, 424–432 (2021). https://doi.org/10.1007/s11595-021-2426-6

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  • DOI: https://doi.org/10.1007/s11595-021-2426-6

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