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Numerical Investigation of Micro-Galvanic Corrosion in Mg Alloys: Role of the Cathodic Intermetallic Phase Size and Spatial Distributions

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Magnesium Technology 2020

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

Abstract

Magnesium alloys are of increasing interest in structural applications due to their low-density, moderate specific strength and stiffness, recyclability, and high damping among other properties. However, the wide-scale applicability of magnesium alloys in structural applications has been limited due to many factors including its poor corrosion resistance . In this work, a numerical investigation to simulate the micro-galvanic corrosion behavior was performed to examine the influence of the size and distribution of cathodic intermetallic phase (β–Mg17Al12) in a Mg matrix. The ratio of cathodic to anodic surface area was kept constant in each simulation condition to understand the effect of size and spacing distributions. In general, fragmentation of a larger intermetallic particle into smaller ones was determined to enhance the localized current density. However, the uniform distribution rather than clustered or non-uniform distribution of this small intermetallic phase throughout the matrix was found to reduce the overall dissolution current density and hence, pitting corrosion severity.

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Acknowledgements

The authors would like to thank Pacific Northwest National Laboratory and the Office of Naval Research (N000141110793) for their financial assistance.

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Authors and Affiliations

  1. School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ, 85287, USA

    V. K. Beura, P. Garg & K. N. Solanki

  2. Pacific Northwest National Laboratory, Energy and Environment Directorate, 902 Battelle Boulevard, Richland, WA, 99354, USA

    V. V. Joshi

Authors
  1. V. K. Beura
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  2. P. Garg
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  3. V. V. Joshi
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  4. K. N. Solanki
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Corresponding author

Correspondence to K. N. Solanki .

Editor information

Editors and Affiliations

  1. Tuscaloosa, AL, USA

    J. Brian Jordon

  2. University of Florida, Gainesville, FL, USA

    Victoria Miller

  3. Pacific Northwest National Laboratory, Richland, WA, USA

    Vineet V. Joshi

  4. IND LLC, South Jordan, UT, USA

    Neale R. Neelameggham

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Beura, V.K., Garg, P., Joshi, V.V., Solanki, K.N. (2020). Numerical Investigation of Micro-Galvanic Corrosion in Mg Alloys: Role of the Cathodic Intermetallic Phase Size and Spatial Distributions. In: Jordon, J., Miller, V., Joshi, V., Neelameggham, N. (eds) Magnesium Technology 2020. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-36647-6_34

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