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Effect of Aluminum Content on the Crevice Corrosion Behavior of Magnesium Alloys

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Abstract

In this work, the effect of aluminum content on the crevice corrosion behavior of the magnesium alloys has been investigated. The as-cast AZ31, AM60B and AZ80 alloys were subjected to the crevice corrosion in a freely aerated 3.5 wt.% NaCl solution, and the extent of the damage was quantified using weight loss measurement and 3D surface topography using an optical profilometer. The as-cast AM60B and AZ31 alloys exhibited the lowest and highest crevice corrosion resistances, respectively. The surface investigation using a scanning electron microscopy (SEM)/energy-dispersive spectroscopy (EDS) and analysis of the corrosion products by Raman spectroscopy, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) suggested that the corrosion damage predominantly was primarily a function of the volume fraction and distribution of the Mg17Al12 precipitates. The lower corrosion resistance of the as-cast AM60B alloy (corrosion rate ~ 240 mpy) as compared to the as-cast AZ80 alloys (corrosion rate ~ 60 mpy) was attributed to the combined effect of the reduction in the barrier effect of the Mg17Al12 precipitates due to their discontinuous distribution and increase in the extent of the micro-galvanic effect due to the lower aluminum content in the α-Mg matrix in the AM60B alloy.

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Acknowledgements

The authors would like to thank Prof. Warren Poole at the University of British Colombia for providing as-cast AZ31 and AZ80 alloys. Authors acknowledge the financial support received from Indian Institute of Technology Kanpur. Authors also acknowledge the facilities at the Advanced Centre for Materials Science (ACMS), IIT Kanpur.

Funding

Financial support was provided by Indian Institute of Technology Kanpur.

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Author notes

  1. Neetu and Nikhila Ireddy have contributed equally as a first author.

Authors and Affiliations

  1. Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, UP, 208016, India

    Neetu, Nikhila Ireddy, Subha Sanket Panda, Uttam Reddy, K. Mondal & Sudhanshu S. Singh

  2. Department of Materials Science and Engineering, Indian Institute of Technology Delhi, Delhi, 110016, India

    Jayant Jain

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  1. Neetu
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  2. Nikhila Ireddy
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  3. Subha Sanket Panda
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  6. K. Mondal
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Correspondence to K. Mondal or Sudhanshu S. Singh.

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Neetu, Ireddy, N., Panda, S.S. et al. Effect of Aluminum Content on the Crevice Corrosion Behavior of Magnesium Alloys. Trans Indian Inst Met 77, 1265–1274 (2024). https://doi.org/10.1007/s12666-023-03175-x

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