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Effect of Various Additives on Performance of Plasma Electrolytic Oxidation Coatings Formed on AZ31 Magnesium Alloy in the Phosphate Electrolytes

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Abstract

Plasma electrolytic oxidation (PEO) coatings were prepared on AZ31 magnesium alloy using alkaline phosphate as base electrolyte system, and with the addition of sodium silicate (Na2SiO3), sodium aluminate (NaAlO2) and potassium fluorozirconate (K2ZrF6) as additives. The microstructure, phase composition and element composition as well as surface profile of the PEO coatings were analyzed by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), and threedimensional (3D) optical profilometry. The corrosion and wear properties were evaluated by electrochemical potentiodynamic polarization in 3.5 wt% NaCl solution and ball-on-disc wear tests, respectively. The results showed that the anions of the additives effectively participated in the coating formation influencing its microstructural features, chemical composition, corrosion resistance and tribological behaviour. It was observed that the sample treated by PEO in the electrolyte solution containing K2ZrF6 as an additive showed better corrosion and abrasive resistance.

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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) & Nan Xiang

  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) & Nan Xiang

  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) & Nan Xiang

  4. College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China

    Hongxia Li

Authors
  1. Junjie Zhuang  (庄俊杰)
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  2. Renguo Song  (宋仁国)
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  3. Hongxia Li
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  4. Nan Xiang
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Corresponding author

Correspondence to Renguo Song  (宋仁国).

Additional information

Funded by National Natural Science Foundation of China (No.51371039), Zhejiang Provincial Natural Science Foundation of China (No. LGG18E020004), Open Foundation of Zhejiang Provincial Top Key Discipline of Mechanical Engineering, and Science and Technology Project of Zhejiang Province (No.2015C37037)

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Zhuang, J., Song, R., Li, H. et al. Effect of Various Additives on Performance of Plasma Electrolytic Oxidation Coatings Formed on AZ31 Magnesium Alloy in the Phosphate Electrolytes. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 33, 703–709 (2018). https://doi.org/10.1007/s11595-018-1881-1

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  • DOI: https://doi.org/10.1007/s11595-018-1881-1

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