Corrosion resistance of AZ31 magnesium alloy treated by plasma electrolytic oxidation

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Abstract

The coating prepared by plasma electrolytic oxidation (PEO) was created on AZ31 magnesium alloy surface with the aim to evaluate its effect on corrosion resistance. The DC current was applied on the sample in solution consisted of 10 g/l Na3PO4·12H2O and 1 g/l KOH. Additional samples were prepared with 2 and 4 minutes of preparation to observe evolution of the PEO coating. Morphology of the coatings was evaluated by scanning electron microscopy and chemical composition was examined by EDX analysis. Electrochemical characteristic were measured by potentiodynamic polarization tests and electrochemical impedance spectroscopy in 0.1 M NaCl at the laboratory temperature. Obtained data were presented in form of potentiodynamic curves and Nyquist diagrams. Results of analysis showed that plasma electrolytic oxidation coating positively influence corrosion resistance of AZ31 magnesium alloy in chosen corrosive environment.

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  • 1. Antonova O. A. et al. Microstructure and texture of pure magnesium after room-temperature lateral extrusion Materials Science and Engineering A 2017 26 319-329.

  • 2. Nový F. et al. Very high cycle fatigue behaviour of as-extruded AZ31 AZ80 and ZK60 magnesium alloys International Journal of Materials and Research 2009 100 288-291.

  • 3. Homma T. Kunito N. Kamado S. Fabrication of extraordinary high-strength magnesium alloy by hot extrusion Scripta Materialia 2009 61 644-647.

  • 4. Fintová S. et al. Improvement of electrochemical corrosion characteristics of AZ61 magnesium alloy with unconventional fluoride conversion coatings Surface and Coatings technology 2019 357 638-650.

  • 5. Curioni M. The behaviour of magnesium during free corrosion andpotentiodynamic polarization investigated by real-time hydrogenmeasurement and optical imaging Electrochimica Acta 2014 120 284-292.

  • 6. Atrens A. Dietzel W. The Negative Difference Effect and Unipositive Mg+. In Advanced Engineering Materials Advanced Engineering Materials 2007 9 292-297.

  • 7. Birbilis N. et al. Evidence for enhanced catalytic activity of magnesium arising from anodic activity Electrochimica Acta 2014 132 277-283.

  • 8. Esmaily M. et al. Fundamentals and advances in magnesium alloy corrosion Progress in Materials Science 2017 89 92-193.

  • 9. Mhaede M. Pastorek F. Hadzima B. Influence of shot peening on corrosion properties of biocompatible magnesium alloy AZ31 coated by dicalcium phosphate dihydrate (DCPD) Materials Science and Engineering C 2014 39 330-335.

  • 10. Darband G.B. et al. Plasma electrolytic oxidation of magnesium and its alloys: Mechanism properties and applications Journal of Magnesium and Alloys 2017 5 74-132.

  • 11. Chang L. et al. Growth regularity of ceramic coating on magnesium alloy by plasma electrolytic oxidation Journal of Alloys and Compounds 2009 468 462-465.

  • 12. Gu Y. et al. Effect of oxidation time on the corrosion behavior of micro-arc oxidation produced AZ31 magnesium alloys in simulated body fluid Journal of Alloys and Compounds 2012 543 109-117.

  • 13. Hussein R.O. Northwood D.O. Nie X. The effect of processing parameters and substrate composition on the corrosion resistance of plasma electrolytic oxidation (PEO) coated magnesium alloys Surface and Coatings Technology 2013 237 357-368.

  • 14. Kajánek D. Hadzima B. Pastorek F. Electrochemical characterization of AZ31 magnesium alloy treated by ultrasonic impact peening Komunikácie / Communications – Scientiffic Letters of the University of Žilina 2018 20 24-29.

  • 15. Raj X.J. Nishimura T. Studies on galvanic corrosion of iron-magnesium couple by scanning electrochemical microscopy in 0.1 M NaCl solution Journal of Industrial and Engineering Chemistry 2016 41 141-150.

  • 16. Kajánek D. et al. Study of Corrosion Behavior of Dicalcium Phosphate-dihydrate (DCPD) Coating Prepared by Large Amplitude Sinusoidal Voltammetry (LASV) Technique on ZW3 Proceedia Engineering 2017 192 399-403.

  • 17. Kajánek D. et al. Electrochemical impedance spectroscopy characterization of ZW3 magnesium alloy coated by DCPD using LASV deposition technique Acta Metallurgica Slovaca 2017 23 147-154.

  • 18. Amirudin A. Thierry D. Application of electrochemical impedance spectroscopy to study the degradation of polymer-coated metals Progress in Organic Coatings 1995 26 1-28.

  • 19. Song G.L. Recent progress in corrosion and protection of magnesiu alloys Advanced Engineering Materials 2005 7 563-586.

  • 20. Liu C. et al. Characterization and corrosion behavior of plasma electrolytic oxidation coated AZ91-T6 magnesium alloy Surface and Coatings Technology 2016 304 179-187.

  • 21. Zhou J. et al. Accelerated Degradation Behavior and Cytocompatibility of Pure Iron Treated with Sandblasting Applied Materials and Interfaces 2016 8 26482-26492.

  • 22. Hadzima B. et al. Cathodic anticorrosive protection of magnesium alloy AZ91 Kovové materiály 2003 41 257-269.

  • 23. Bagherifard S. et al. Effects of nanofeatures induced by severe shot peening (SSP) on mechanical corrosion and cytocompatibility properties of magnesium alloy AZ31 Acta Biomaterialia 2018 66 93-108.

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