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Corrosion Behaviour of Injection- and Compression-Moulded Nd-Fe-B and Sm-Fe-N Magnets with Different Polymer Binders
Nikolina Lešić1,2, Nataša Kovačević3, Ingrid Milošev1,2
1Department of Physical and Organic Chemistry, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia.
Sm-Fe-N and Nd-Fe-B magnets show varying corrosion resistance based on processing and particle size. Finer powders and specific molding methods impact durability, though both magnet types demonstrate good thermal stability.
Area of Science:
- Materials Science
- Corrosion Engineering
Background:
- Neodymium-iron-boron (Nd-Fe-B) and Samarium-iron-nitrogen (Sm-Fe-N) magnets are critical for modern technologies.
- Understanding their environmental durability is essential for reliable performance.
Purpose of the Study:
- To investigate the corrosion behavior and environmental durability of injection- and compression-molded Nd-Fe-B and Sm-Fe-N magnets.
- To evaluate the effects of magnetic powder type, particle size, and polymer binder on corrosion resistance.
Main Methods:
- Potentiodynamic polarization in electrolytes across a wide pH range (1.8-12.8).
- Bulk corrosion testing (BCT) for hygrothermal resistance.
- Thermal shock tests for thermal stability assessment.
Main Results:
- Sm-Fe-N magnets showed slightly superior corrosion resistance compared to Nd-Fe-B magnets.
- Finer magnetic powders (100 µm) exhibited lower corrosion resistance due to increased surface area.
- Compression-molded magnets showed greater irreversible magnetic property loss after BCT.
- All magnets demonstrated good thermal stability with temporary magnetic property reduction after thermal shock.
Conclusions:
- Processing method and particle size significantly influence magnet corrosion resistance.
- Sm-Fe-N magnets offer a slight advantage in corrosion resistance over Nd-Fe-B.
- Despite surface corrosion, both magnet types exhibit robust thermal stability.
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