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Corrosion Behavior of Die-Cast and Friction Stir-Processed AZ91 Magnesium Alloys in 5% NaCl

  • Minal Sanjay DaniEmail author
  • Indravadan B. Dave
  • Bijal Parmar
Original Contribution
  • 29 Downloads

Abstract

Corrosion resistance and microstructure by optical microscopy of commercially available die-cast, friction stir-processed (without aluminum powder) and friction stir-processed (with aluminum powder) AZ91 magnesium (Mg) alloys (three conditions) were investigated. For corrosion study, salt spray and immersion tests in 5% NaCl solution were carried out. Corrosion behavior was analyzed by scanning electron microscopy for investigation of pits available after 48 h in specimens of all three conditions. This SEM investigation proved that AZ91 Mg alloy that is friction stir-processed with aluminum powder has the lowest pit size compared to the friction stir-processed AZ91 Mg alloy and commercially available die-cast AZ91 Mg alloy. This is because of more solubility of aluminum in α-phase and high fraction of β-phase (Mg17Al12) which improves corrosion resistance of friction stir-processed AZ91 Mg alloy with aluminum powder.

Keywords

Magnesium Corrosion Friction stir processing Salt spray test Immersion test 

Notes

Acknowledgements

The authors gratefully acknowledge the support of Mechanical department, School of Technology Pandit Deendayal Petroleum University (PDPU), Gandhinagar, Gujarat, India, for the guidance and utilization of universal milling machine for friction stir processing.

References

  1. 1.
    Avedesian, M.M., Baker, H., ASM specialty handbook: Magnesium and Magnesium alloys. (ASM International, Materials Park, OH, 1999), pp. 4–6Google Scholar
  2. 2.
    Shaw, B.A., in ASM handbook, Corrosion: Fundamentals, Testing, and Protection. vol 13A (ASM International, 2003)Google Scholar
  3. 3.
    A. Pardo, M.C. Merino, A.E. Coy, R. Arrabal, F. Viejo, E. Matykina, Corros. Sci. 50, 823–834 (2008)CrossRefGoogle Scholar
  4. 4.
    Y.X. Gan, D. Solomon, M. Reinbolt, Materials (2010).  https://doi.org/10.3390/ma3010329 Google Scholar
  5. 5.
    J.P. Lalith Gnannavel, S. Vijayan, J. Chem. Pharm. Sci. ISSN:0974-2115Google Scholar
  6. 6.
    R.S. Misra, Z.Y. Ma, I. Charit, Mater. Sci. Eng. A 341, 307–310 (2003)CrossRefGoogle Scholar
  7. 7.
    ASTM standard practice for operating salt spray (fog) allpuratus-B117-11Google Scholar
  8. 8.
    ASTM G31-72_Laboratory Immersion Corrosion Testing of MetalsGoogle Scholar
  9. 9.
    G. Faraji, P. Asadi, Mater. Sci. Eng. A 528, 2431–2440 (2011)CrossRefGoogle Scholar
  10. 10.
    L. Zhu, G. Song, Surf. Coat. Technol. 200, 2834–2840 (2006)CrossRefGoogle Scholar

Copyright information

© The Institution of Engineers (India) 2019

Authors and Affiliations

  • Minal Sanjay Dani
    • 1
    Email author
  • Indravadan B. Dave
    • 1
  • Bijal Parmar
    • 2
  1. 1.Department of Metallurgy EngineeringGovernment Engineering CollegeGandhinagarIndia
  2. 2.Unitech Metallurgical ServicesAhmedabadIndia

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