| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Magnesium Technology 2020
|
| Presentation Title |
Numerical Investigation of Micro-galvanic Corrosion in Mg Alloys: Role of the Cathodic Intermetallic Phase Size and Spatial Distributions |
| Author(s) |
Vikrant Kumar Beura, Pulkit Garg, Vineet Joshi, Kiran N. Solanki |
| On-Site Speaker (Planned) |
Vikrant Kumar Beura |
| Abstract Scope |
Magnesium alloys are of increasing interest 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 have been limited due to many factors including its poor corrosion resistance. In this work, a numerical investigation examining the influence of cathodic intermetallic phase (β-Mg17Al12) size and spacing distributions in a Mg matrix was carried out to simulate the micro-galvanic corrosion behavior. The ratio of cathodic to anodic surface area was kept constant in each run to understand the effect of size and spacing distributions. In general, fragmentation of a larger intermetallic into smaller ones was found to enhance the localized current density. However, the uniform distribution of this small intermetallic phase throughout the matrix was found to reduce the overall dissolution current density and hence pitting corrosion severity. |
| Proceedings Inclusion? |
Planned: |