| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Phase-field Modeling of Galvanic Corrosion in Magnesium-Aluminum Joints |
| Author(s) |
Kubra Karayagiz, Adam Powell, Qingli Ding, Brajendra Mishra |
| On-Site Speaker (Planned) |
Kubra Karayagiz |
| Abstract Scope |
Aluminum and magnesium alloys are shown to be amongst the best candidate materials for light-weighting purposes due to their superior properties. However, the joining of Al and Mg is challenging due to galvanic corrosion, a common issue in dissimilar metal joints. A quaternary phase-field model to study the galvanic corrosion in Al-Mg joints is presented in this work. The model accounts for the conservation of charge, transport of ions in the electrolyte, the electrochemical reactions at the metal-electrolyte interface, and the formation of hydroxide phases on the metal surface. Two-dimensional simulations are performed to predict the corrosion microstructure, corrosion rate, and galvanic current density in diffusion bonded Al-Mg couples immersed in an electrolyte solution. Galvanic corrosion experiments are conducted for validation purposes. The corrosion model formulation presented here is intended for later use with micro-galvanic corrosion between pure metal and intermetallic phases in complex friction stir welded magnesium-aluminum joint microstructures. |
| Proceedings Inclusion? |
Planned: |