Distinct Responses of Corrosion Behavior to the Intermetallic/Impurity Redistribution During Hot Processing in Micro-Alloyed Mg Alloys
By tuning the extrusion parameters, the corrosion performances of as-extruded Mg-0.5Zn(-0.2X) alloys (X: Ca/Sr/Ag/In/Cu, denoted as Z05, Z0502-Ca, Z0502-Sr, Z0502-Ag, Z0502-In and Z0502-Cu, respectively) with similar grain sizes were investigated and compared with their as-cast counterparts. The formed Fe-Si precipitates after hot processing significantly accelerate the corrosion rates of Z05, Z0502-Ag and Z0502-In, whereas the driving force from the Fe-encapsulated MgCaSi(Fe) and MgSrSi(Fe) precipitates are not as strong in Z0502-Ca and Z0502-Sr. Impacts from Fe impurity in Z0502-Cu are masked in the fast corrosion due to the noble Mg2Cu intermetallics. Fe precipitation during hot processing is critical for micro-alloyed systems, as the changes in intermetallic/impurity distributions impact the corrosion performances profoundly. The enthalpy of formation and the potential difference are the key factors that influence the distribution of precipitate during hot processing.
Authors
- Hong Sun Yang (ORCID: https://orcid.org/0000-0003-0169-6479)
- Jan Bohlen (ORCID: https://orcid.org/0009-0008-9382-4805)
- Björn Wiese (ORCID: https://orcid.org/0000-0003-3094-3803)
- Yan Su (ORCID: https://orcid.org/0000-0001-6085-6853)
- Y. Jin (ORCID: https://orcid.org/0000-0003-1282-9521)
Institutions
- Chongqing University (CN)
- Helmholtz-Zentrum Hereon (DE)
Publication Details
- Journal
- Materials
- Published
- 2025-12-04
- DOI
- https://doi.org/10.3390/ma18235473
- Primary Topic
- Magnesium Alloys: Properties and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Natural Science Foundation of China
- Centre Scientifique et Technique du Bâtiment