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Effects of oxidation time on corrosion resistance of plasma electrolytic oxidation coatings on magnesium alloy

  • Junjie Zhuang , Renguo Song , Nan Xiang , Junpeng Lu and Ying Xiong
Published/Copyright: September 4, 2017
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 108 Issue 9

Abstract

The plasma electrolytic oxidation (PEO) technique was used to coat AZ31 magnesium alloy in a phosphate-based electrolyte. Effects of oxidation time on the morphology, phase structure, and corrosion resistance of the ceramic coatings were systematically investigated by scanning electron microscopy, X-ray diffraction, potentiodynamic polarization and electrochemical impedance spectroscopy testing. The main components of the resulting coatings were MgO, MgF2 and t-ZrO2. It was also found that there was a significant influence of the oxidation time on the corrosion resistance of the coatings. The coating obtained under the oxidation time of 10 min exhibited a corrosion current of 3.89 × 10−6 A cm−2 in 3.5 wt.% NaCl solution, which was a significant decrease compared with the uncoated magnesium alloy. The results of the corrosion tests indicated that the PEO coating formed at 10 min demonstrates a higher corrosion resistance compared to the samples formed at 5, 15 and 20 min.

Keywords: AZ31 magnesium alloy; Plasma electrolytic oxidation; Ceramic coating; Microstructure; Corrosion resistance
*Correspondence address, Dr. Renguo Song, School of Materials Science and Engineering, Changzhou University, Changzhou 213164, P.R. China, Tel: +86-519-86330069, Fax: +86-519-86330069, Email:

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Received: 2016-12-21
Accepted: 2017-06-13
Published Online: 2017-09-04
Published in Print: 2017-09-15

© 2017, Carl Hanser Verlag, München

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  1. Contents
  2. Contents
  3. Editorial
  4. Note from the Editor-in-Chief
  5. Original Contributions
  6. Application of the grey-based fuzzy logic approach for materials selection
  7. Study of phase transformation and crystal structure of Co nanowires
  8. Continuous cooling transformation behavior and the kinetics of bainite formation in a bainitic–martensitic steel
  9. The substructures and crystallographic features of martensite in high-carbon steel after cryogenic treatment
  10. Mechanical characterization of YBCO thin films using nanoindentation and finite element method
  11. Enhancing mechanical properties of wires by a novel continuous severe plastic deformation method
  12. Evolution of microstructure and mechanical properties of Mg-3Al-1Zn alloy through the corner of a deep cup-shaped forged part
  13. Effects of oxidation time on corrosion resistance of plasma electrolytic oxidation coatings on magnesium alloy
  14. Experimental investigation of phase equilibria in the Ni–Nb–V ternary system
  15. Short Communications
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  17. DGM News
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https://doi.org/10.3139/146.111541
Keywords for this article
AZ31 magnesium alloy; Plasma electrolytic oxidation; Ceramic coating; Microstructure; Corrosion resistance

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Note from the Editor-in-Chief
  5. Original Contributions
  6. Application of the grey-based fuzzy logic approach for materials selection
  7. Study of phase transformation and crystal structure of Co nanowires
  8. Continuous cooling transformation behavior and the kinetics of bainite formation in a bainitic–martensitic steel
  9. The substructures and crystallographic features of martensite in high-carbon steel after cryogenic treatment
  10. Mechanical characterization of YBCO thin films using nanoindentation and finite element method
  11. Enhancing mechanical properties of wires by a novel continuous severe plastic deformation method
  12. Evolution of microstructure and mechanical properties of Mg-3Al-1Zn alloy through the corner of a deep cup-shaped forged part
  13. Effects of oxidation time on corrosion resistance of plasma electrolytic oxidation coatings on magnesium alloy
  14. Experimental investigation of phase equilibria in the Ni–Nb–V ternary system
  15. Short Communications
  16. Thermal effects on electromagnetic properties of Cu1-xMgxFe2O4 ferrites
  17. DGM News
  18. DGM News
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