| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Magnesium Technology 2023
|
| Presentation Title |
E-19: Formation of CO2 Absorption Induced Corrosion Resistant Magnesium Carbonate Layer Formation on Various Magnesium Alloys |
| Author(s) |
Gyoung Gug Jang, Jiheon Jun, Yi-Feng Su |
| On-Site Speaker (Planned) |
Gyoung Gug Jang |
| Abstract Scope |
We demonstrated that intermediate thermal CO2 treatment forms a highly corrosion-resistant magnesium carbonate layer on two Mg alloys (i.e., AM60 and AZ91D) via molten salt facilitated CO2 absorption to MgO layer. The corrosion mitigation performance from this treatment for each alloy was fully evaluated by electrochemical measurements and hydrogen collection using flat and curved surface specimens. Particularly, a dip coating applied on Mg alloy samples with curved surfaces and holes, to demonstrate the feasibility of this treatment to achieve corrosion resistance of Mg alloy parts with more complex geometries. CO2 thermal treated Mg alloy specimens exhibited the long-term corrosion resistance, compared to the untreated specimens. High resolution microscopic analysis and XRD measurement were employed to investigate the chemical composition of carbonate layer and define the formation mechanism. The results from SEM, TEM-EDS, STEM-EELS and XRD indicated that the porous MgO was reconstructed to a dense and protective Mg-O-C-Li layer. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnesium, Surface Modification and Coatings, Characterization |