Improved corrosion resistance of Nd-Fe-B magnets View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1991-09

AUTHORS

A. S. Kim, F. E. Camp

ABSTRACT

Corrosion of Nd-Fe-B magnets has been an ongoing problem to be resolved. Although various corrosion protection methods have been proposed, the corrosion problem still remains. Therefore, the factors affecting the corrosion resistance of uncoated Nd-Fe-B magnets are discussed. The corrosion resistance of the Nd-Fe-B magnet is closely related to the microstructure which is determined by controlling the minor elements such as C, O, and N. The corrosion rate rapidly decreases as the carbon content increases up to about 0.06%. This may be due to the stabilization of the Nd-rich phase by dissolution of carbon in that phase. When carbon content exceeds the saturation limit (∼0.15%) in the Nd-rich phase, the corrosion rate starts to increase. The corrosion rate also rapidly decreases with increasing oxygen content up to about 0.6%. When oxygen content is low, the alloy forms a thick Nd-rich phase on both grain boundaries and triple junctions of the grain boundary. As the oxygen content increases, the Nd-rich coating on the grain boundaries becomes thinner and agglomerates into the triple junction by changing Nd-rich phase from α-Nd to NdOx. A small increase in N content further improves the corrosion resistance by changing NdOx to stable Nd2O3. This microstructural change and stabilization of the Nd-rich phase may be responsible for improving the corrosion resistance. The maximum corrosion resistance is obtained when O = 0.6% minimum, C = 0.06 to 0.14%, and N = 0.04 to 0.08%. More... »

PAGES

175-182

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02834176

DOI

http://dx.doi.org/10.1007/bf02834176

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1030231536


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