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Electrodeposited Metallic Coatings as a Manufacturing Route to Enhance the Durability of NdFeB Magnets

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Abstract:

Fe-Nd-B Rare earth magnets are widely used in high performance applications but suffer from poor corrosion resistance due to their multiphase microstructure and the preferential dissolution of rare earth rich intergranular phases. In this study, the corrosion behaviour of Fe-Nd-B magnets was investigated and the effectiveness of electroless nickel coatings as a protective solution was evaluated. Microstructural and compositional analyses were combined with potentiodynamic polarisation tests, comparing bare and coated magnets with low alloy steel. Coating adhesion was assessed by pull off testing according to ASTM D4541. The results show that Fe-Nd-B magnets are significantly more susceptible to corrosion than steel, while nickel exhibits a passive behaviour in the investigated environment. Electroless nickel coatings provide effective protection and display adhesion comparable to that measured on steel substrates, demonstrating their suitability for corrosion protection of Fe-Nd-B magnets.

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Periodical:

Solid State Phenomena (Volume 391)

Pages:

89-94

DOI:

https://doi.org/10.4028/p-1gR22Z

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Online since:

April 2026

Authors:

Fabio Scherillo*, Alessia Serena Perna, Antonio Viscusi

Keywords:

Corrosion Protection, Electrodeposition, Metallic Coatings, Rare-Earth Magnets

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Creative Commons CC BY 4.0

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* - Corresponding Author

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