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2020 | OriginalPaper | Chapter

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

Authors : V. K. Beura, P. Garg, V. V. Joshi, K. N. Solanki

Published in: Magnesium Technology 2020

Publisher: Springer International Publishing

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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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Title: Numerical Investigation of Micro-Galvanic Corrosion in Mg Alloys: Role of the Cathodic Intermetallic Phase Size and Spatial Distributions
Authors: V. K. Beura
P. Garg
V. V. Joshi
K. N. Solanki
Publisher: Springer International Publishing
Book: Magnesium Technology 2020
Print ISBN: 978-3-030-36646-9

Electronic ISBN: 978-3-030-36647-6

Copyright Year: 2020
DOI: https://doi.org/10.1007/978-3-030-36647-6_34

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