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Effect of Current Density on Microstructure and Corrosion Behavior of Plasma Electrolytic Oxidation Coated 6063 Aluminum Alloy

  • Metallic Materials
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Journal of Wuhan University of Technology-Mater. Sci. Ed. Aims and scope Submit manuscript

Abstract

Plasma electrolytic oxidation (PEO) coatings were fabricated on 6063 aluminum alloy in a cheap and convenient electrolyte. The effect of different current densities, i e, 5, 10, 15, and 20 A/dm2 on the microstructure and corrosion behavior of coatings was comprehensively studied by scanning electron microscopy (SEM), stereoscopic microscopy, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS), respectively. It is found that the pore density decreases and the pore size increases with increasing current density. The XRD results show that the coatings are only composed of α-Al2O3 and γ-Al2O3. Potentiodynamic polarization test proves that the coating formed under 10 A/dm2 possesses the best anticorrosion property. The long time EIS test shows that the coating under 10 A/dm2 is able to protect the aluminum alloy substrate after long time of immersion in 0.59 M NaCl solution, which confirms the salt solution immersion test results in 2 M NaCl solution.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Changzhou University, Changzhou, 213164, China

    Junjie Zhuang  (庄俊杰) & Renguo Song  (宋仁国)

  2. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, 213164, China

    Junjie Zhuang  (庄俊杰) & Renguo Song  (宋仁国)

  3. Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou, 213164, China

    Junjie Zhuang  (庄俊杰) & Renguo Song  (宋仁国)

  4. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China

    Chuanbo Zheng

Authors
  1. Junjie Zhuang  (庄俊杰)
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  2. Renguo Song  (宋仁国)
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  3. Chuanbo Zheng
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Corresponding author

Correspondence to Renguo Song  (宋仁国).

Additional information

Funded by the National Natural Science Foundation of China (Nos. 51371039 and 51871031)

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Zhuang, J., Song, R. & Zheng, C. Effect of Current Density on Microstructure and Corrosion Behavior of Plasma Electrolytic Oxidation Coated 6063 Aluminum Alloy. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 33, 1503–1510 (2018). https://doi.org/10.1007/s11595-018-1998-2

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  • DOI: https://doi.org/10.1007/s11595-018-1998-2

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