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

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

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.

Original languageEnglish (US)
Title of host publicationMagnesium Technology 2020
EditorsJ. Brian Jordon, Victoria Miller, Vineet V. Joshi, Neale R. Neelameggham
PublisherSpringer
Pages217-223
Number of pages7
ISBN (Print)9783030366469
DOIs
StatePublished - 2020
EventMagnesium Technology Symposium held at the 149th Annual Meeting and Exhibition, TMS 2020 - San Diego, United States
Duration: Feb 23 2020Feb 27 2020

Publication series

NameMinerals, Metals and Materials Series
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696

Conference

ConferenceMagnesium Technology Symposium held at the 149th Annual Meeting and Exhibition, TMS 2020
CountryUnited States
CitySan Diego
Period2/23/202/27/20

Keywords

  • Cathodic particles
  • Fragmentation
  • Localized corrosion
  • Numerical simulation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy Engineering and Power Technology
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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