Corrosion Behaviour of Injection- and Compression-Moulded Nd–Fe–B and Sm–Fe–N Magnets with Different Polymer Binders.
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| Title: | Corrosion Behaviour of Injection- and Compression-Moulded Nd–Fe–B and Sm–Fe–N Magnets with Different Polymer Binders. |
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| Authors: | Lešić, Nikolina1,2 (AUTHOR), Kovačević, Nataša2,3 (AUTHOR), Milošev, Ingrid1,2,3 (AUTHOR) ingrid.milosev@ijs.si |
| Source: | Polymers (20734360). May2026, Vol. 18 Issue 9, p1123. 21p. |
| Subjects: | Injection molding, Compression molding, Polymeric composites, Thermal stability, Corrosion engineering, Magnetic particles, Permanent magnets |
| Abstract: | The corrosion behaviour and environmental durability of injection- and compression-moulded Nd–Fe–B and Sm–Fe–N magnets were investigated. For injection-moulded magnets, the effects of magnetic powder type (Nd–Fe–B and Sm–Fe–N), magnetic powder particle size (100 µm and 400 µm), and polymer binder (PPS and PA12) on corrosion resistance were studied. For compression-moulded magnets with an epoxy binder, the effects of powder type and size were examined. Corrosion resistance was investigated using potentiodynamic polarisation in electrolytes of varying pH (1.8–12.8). The Sm–Fe–N magnets exhibited slightly better corrosion resistance than the Nd–Fe–B magnets, irrespective of the polymer binder. The finer magnetic powders (100 µm) showed lower corrosion resistance due to their larger specific surface area, with a more pronounced effect in the compression-moulded magnets. The type of polymer binder had only a minor effect. The hygrothermal corrosion resistance and thermal stability were evaluated using bulk corrosion (BCT) and thermal shock tests, respectively. Surface corrosion was observed in all magnets after the BCT, with the compression-moulded magnets exhibiting a greater irreversible loss of magnetic properties. The thermal shock test caused a temporary reduction in magnetic properties, with recovery after remagnetisation, demonstrating the good thermal stability of both magnet types. [ABSTRACT FROM AUTHOR] |
| Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 193716258 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Corrosion Behaviour of Injection- and Compression-Moulded Nd–Fe–B and Sm–Fe–N Magnets with Different Polymer Binders. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Lešić%2C+Nikolina%22">Lešić, Nikolina</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kovačević%2C+Nataša%22">Kovačević, Nataša</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Milošev%2C+Ingrid%22">Milošev, Ingrid</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<i> ingrid.milosev@ijs.si</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Polymers+%2820734360%29%22">Polymers (20734360)</searchLink>. May2026, Vol. 18 Issue 9, p1123. 21p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Injection+molding%22">Injection molding</searchLink><br /><searchLink fieldCode="DE" term="%22Compression+molding%22">Compression molding</searchLink><br /><searchLink fieldCode="DE" term="%22Polymeric+composites%22">Polymeric composites</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+stability%22">Thermal stability</searchLink><br /><searchLink fieldCode="DE" term="%22Corrosion+engineering%22">Corrosion engineering</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+particles%22">Magnetic particles</searchLink><br /><searchLink fieldCode="DE" term="%22Permanent+magnets%22">Permanent magnets</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The corrosion behaviour and environmental durability of injection- and compression-moulded Nd–Fe–B and Sm–Fe–N magnets were investigated. For injection-moulded magnets, the effects of magnetic powder type (Nd–Fe–B and Sm–Fe–N), magnetic powder particle size (100 µm and 400 µm), and polymer binder (PPS and PA12) on corrosion resistance were studied. For compression-moulded magnets with an epoxy binder, the effects of powder type and size were examined. Corrosion resistance was investigated using potentiodynamic polarisation in electrolytes of varying pH (1.8–12.8). The Sm–Fe–N magnets exhibited slightly better corrosion resistance than the Nd–Fe–B magnets, irrespective of the polymer binder. The finer magnetic powders (100 µm) showed lower corrosion resistance due to their larger specific surface area, with a more pronounced effect in the compression-moulded magnets. The type of polymer binder had only a minor effect. The hygrothermal corrosion resistance and thermal stability were evaluated using bulk corrosion (BCT) and thermal shock tests, respectively. Surface corrosion was observed in all magnets after the BCT, with the compression-moulded magnets exhibiting a greater irreversible loss of magnetic properties. The thermal shock test caused a temporary reduction in magnetic properties, with recovery after remagnetisation, demonstrating the good thermal stability of both magnet types. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Polymers (20734360) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3390/polym18091123 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 21 StartPage: 1123 Subjects: – SubjectFull: Injection molding Type: general – SubjectFull: Compression molding Type: general – SubjectFull: Polymeric composites Type: general – SubjectFull: Thermal stability Type: general – SubjectFull: Corrosion engineering Type: general – SubjectFull: Magnetic particles Type: general – SubjectFull: Permanent magnets Type: general Titles: – TitleFull: Corrosion Behaviour of Injection- and Compression-Moulded Nd–Fe–B and Sm–Fe–N Magnets with Different Polymer Binders. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Lešić, Nikolina – PersonEntity: Name: NameFull: Kovačević, Nataša – PersonEntity: Name: NameFull: Milošev, Ingrid IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 05 Text: May2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 20734360 Numbering: – Type: volume Value: 18 – Type: issue Value: 9 Titles: – TitleFull: Polymers (20734360) Type: main |
| ResultId | 1 |
