|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Effect of CO2 Annealing Treatments on Corrosion Behavior of AZ91D Mg Alloy
||Gyoung Gug Jang, Jiheon Jun, Michael Brady
|On-Site Speaker (Planned)
||Gyoung Gug Jang
Application of Mg alloys as structural components of vehicle can improve the energy efficiency. However, the poor corrosion resistance of Mg alloy is one of the major bottlenecks to limit wide vehicle application including vehicle frames. An electrically-insulating layer can be formed from Mg alloy surface to mitigate corrosion. To achieve such an insulating surface, AZ91D Mg alloy was treated by an exploratory treatment method, CO2 annealing with pre-loaded salts to grow carbonate crystalline insulation layers providing corrosion protection for the underlaying AZ91D. The engineered MgO layer on Mg surfaces can absorb CO2 via salt facilitation to form an insulting MgCO3 layer. Currently, systematic surface treatments are underway on AZ91D coupons to facilitate the corrosion protective layer formation. The surface-treated AZ91D samples will be characterized by electrochemical corrosion evaluation. Also, the chemical compositions and microstructure in the surface and sub-surface regions will be characterized, and the results will be reported.
||Magnesium, Characterization, Environmental Effects