Journal of Applied Electrochemistry

, Volume 44, Issue 7, pp 867–879 | Cite as

Effect of process parameters of plasma electrolytic oxidation on microstructure and corrosion properties of magnesium alloys

  • L. Pezzato
  • K. Brunelli
  • S. Gross
  • M. Magrini
  • M. Dabalà
Research Article


In this work, a plasma electrolytic oxidation process was applied to AZ91 and AM50 magnesium alloys and commercially pure magnesium to produce a protective surface layer. The plasma electrolytic oxidation process was carried out in an alkaline phosphate solution with a DC power supply, using relatively high current densities and short treatment times. The influence of some important process parameters such as current density, treatment time and voltage was studied. The layers were characterised by scansion electron microscopy, X-ray diffraction and X-ray photoelectron spectrometry, in order to investigate the effect of the process parameters on the microstructure and chemical composition. The corrosion resistance properties of the obtained layers were investigated by potentiodynamic anodic polarization and electrochemical impedance spectroscopy tests. The current density, applied during the treatment, influenced the morphology and the thickness of the coatings, and, consequently, the corrosion resistance. The corrosion tests evidenced that the layers obtained with plasma electrolytic process provided a good corrosion protection to the magnesium and magnesium alloys.


PEO Magnesium alloy Corrosion XPS EIS Plasma electrolytic oxidation 


  1. 1.
    Liang J, Bala-Srinivasan P, Blawert C, Störmer M, Dietzel W (2009) Electrochemical corrosion behaviour of plasma electrolytic oxidation coatings on AM50 magnesium alloy formed in silicate and phosphate based electrolytes. Electrochim Acta 54:3842–3850CrossRefGoogle Scholar
  2. 2.
    Mordike BL, Ebert T (2001) Magnesium properties—applications—potential. Mater Sci Eng 302:37–45CrossRefGoogle Scholar
  3. 3.
    Nemcovà A, Skeldon P, Thompson GE, Pacal B (2013) Effect of fluoride on plasma electrolytic oxidation of AZ61 magnesium alloy. Surf Coat Technol 232:827–838CrossRefGoogle Scholar
  4. 4.
    Wang L, Chen L, Yan ZC, Wang HL, Peng JZ (2009) Growth and corrosion characteristics of plasma electrolytic oxidation ceramic films formed on AZ31 magnesium alloy. The Chinese journal of Process Engineering 9:592–597Google Scholar
  5. 5.
    Song G, Atrens A (2003) Understanding magnesium corrosion—A framework for improved alloy performance. Adv Eng Mater 5:837–858CrossRefGoogle Scholar
  6. 6.
    Rama Krishna L, Somaraju KRC, Sundararajan G (2003) The tribological performance of ultra-hard ceramic composite coatings obtained through microarc oxidation. Surf Coat Technol 484:163–164Google Scholar
  7. 7.
    Nie X, Meletis EI, Jiang JC, Leyland A, Yerokhin AL, Matthews A (2002) Abrasive wear/corrosion properties and TEM analysis of Al2O3 coatings fabricated using plasma electrolysis. Surf Coat Technol 149:245–251CrossRefGoogle Scholar
  8. 8.
    Snizhko LO, Yerokhin AL, Pilkington A, Gurevina NL, Misnyankin DO, Leyland A, Matthews A (2004) Anodic processes in plasma electrolytic oxidation of aluminium in alkaline solutions. Electrochim Acta 49:2085–2095CrossRefGoogle Scholar
  9. 9.
    Cao FH, Lin LY, Zhang Z, Zhang JQ, Cao CN (2008) Environmental friendly plasma electrolytic oxidation of AM60 magnesium alloy and its corrosion re-sistance. Trans Nonferrous Met Soc China 18:240–247CrossRefGoogle Scholar
  10. 10.
    Martin J, Melhem A, Shchedrina I, Duchanoy T, Nominè A, Henrion G, Czerwiec T, Belmonte T (2013) Effects of electrical parameters on plasma electrolytic oxidation of aluminium. Surf Coat Technol 221:70–76CrossRefGoogle Scholar
  11. 11.
    Ma Y, Nie X, Northwood DO, Hu H (2006) Systematic study of the electrolytic plasma oxidation process on a mg alloy for corrosion protection. Thin Solid Films 494:296–301CrossRefGoogle Scholar
  12. 12.
    Guo HL, Huan C, Xing QW, Hua P, Gu LZ, Bin Z, Heon JL, Si ZY (2010) Effect of additives on structure and corrosion resistance of plasma electrolytic oxidation coatings on AZ91D magnesium alloy in phosphate based electrolyte. Surf Coat Technol 205:36–40CrossRefGoogle Scholar
  13. 13.
    Sreekanth D, Rameshbabu N, Venkateswarlu K (2012) Effect of various additives on morphology and corrosion behavior of ceramic coatings developed on AZ31 magnesium alloy by plasma electrolytic oxidation. Ceram Int 38:4607–4615CrossRefGoogle Scholar
  14. 14.
    Duan H, Yan C, Wang F (2007) Effect of electrolyte additives on performance of plasma electrolytic oxidation films formed on magnesium alloy AZ91D. Electrochim Acta 52:3785–3793CrossRefGoogle Scholar
  15. 15.
    Junghoon L, Yonghwan K, Wonsub C (2012) Effect of Ar bubbling during plasma electrolytic oxidation of AZ31B magnesium alloy in silicate electrolyte. Appl Surf Sci 259:454–459CrossRefGoogle Scholar
  16. 16.
    Li W, Li C, Wen F (2011) Characterization of plasma electrolytic oxidation films formed on AZ31 magnesium alloys by different voltage parameters. Adv Mat Res 168–170:1203–1208CrossRefGoogle Scholar
  17. 17.
    Hussein RO, Northwood DO, Nie X (2012) The influence of pulse timing and current mode on the microstructure and corrosion behaviour of a plasma electrolytic oxidation (PEO) coated AM60B magnesium alloy. J Alloy Compd 541:41–48CrossRefGoogle Scholar
  18. 18.
    Bala Srinivasan P, Liang J, Blawert C, Störmer M, Dietzel W (2009) Effect of current density on the microstructure and corrosion behaviour of plasma electrolytic oxidation treated AM50 magnesium alloy. Appl Surf Sci 255:4212–4218CrossRefGoogle Scholar
  19. 19.
    Kazanski B, Kossenko A, Zinigrad M, Lugovskoy A (2013) Fluoride ions as modifiers of the oxide layer produced by plasma electrolytic oxidation on AZ91D magnesium alloy. Appl Surf Sci 287:461–466CrossRefGoogle Scholar
  20. 20.
    Ma C, Zhang M, Yuan Y, Jing X, Bai X (2012) Tribological behavior of plasma electrolytic oxidation coatings on the surface of Mg-8Li-1Al alloy. Tribol Int 47:62–68CrossRefGoogle Scholar
  21. 21.
    Gun KY, Seok LE, Hyuk SD (2014) Influence of voltage waveform on anodic film of AZ91 Mg alloy via plasma electrolytic oxidation: microstructural characteristics and electrochemical responses. J Alloy Compd 586:356–361Google Scholar
  22. 22.
    Ma C, Lu Y, Sun P, Yuan Y, Jing X, Zhang M (2011) Characterization of plasma electrolytic oxidation coatings formed on Mg–Li alloy in an alkaline polyphosphate electrolyte. Surf Coat Technol 206:287–294CrossRefGoogle Scholar
  23. 23.
    Seah MP, Briggs D, Seah J (1990) Practical surface analysis, auger and X-ray photoelectron spectroscopy. Wiley & Sons 1:543Google Scholar
  24. 24.
    Shirley DA (1972) High-resolution X-ray photoemission spectrum of the valence bands of gold. Phys Rev B 55:4709CrossRefGoogle Scholar
  25. 25.
    Moulder JF, Stickle WF, Sobol PE, Bomben KD, Chastain J (1992) Handbook of X-ray photoelectron spectroscopy. Perkin Elemer Corp, Eden PrairieGoogle Scholar
  26. 26.
    X-ray photoelectron spectroscopy database 20, Version 3.0, National Institute of Standards and Technology, GaithersburgGoogle Scholar
  27. 27.
  28. 28.
    Glisenti A, Frasson A, Galenda A, Natile MM (2010) Au/CeO2 supported nanocatalysts: interaction with methanol. Nanoscie Nanotechn Letters 2(3):213–219CrossRefGoogle Scholar
  29. 29.
    Natile MM, Tomaello F, Glisenti A (2006) WO3/CeO2 nanocomposite powders; synthesis, characterization, and reactivity. Chem Mater 18:3270–3280CrossRefGoogle Scholar
  30. 30.
    Teterin YA, Teterin AY, Lebedev AM, Utkin IO (1998) The XPS spectra of cerium compounds containing oxygen. J Electron Spectr Rel Phenom 88–91:275–279CrossRefGoogle Scholar
  31. 31.
    Wang S, Qiao Z, Wang W, Qian Y (2000) XPS studies of nanometer CeO2 thin films deposited by pulse ultrasonic spray pyrolysis. J Alloys Compd 305:121–124CrossRefGoogle Scholar
  32. 32.
    Felker DL, Sherwood PMA (2002) Magnesium phosphate (Mg3(PO4)2) by XPS. Surf Sci Spectra 9:83–90CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • L. Pezzato
    • 1
  • K. Brunelli
    • 1
  • S. Gross
    • 2
  • M. Magrini
    • 1
  • M. Dabalà
    • 1
  1. 1.DIIUniversity of PaduaPaduaItaly
  2. 2.Dipartimento di ChimicaIENI-CNRPaduaItaly

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