Sintered Nd2Fe14B tends to be vulnerable to corrosion. In particular, corrosion along grain boundaries may cause deterioration of a sintered strong magnet. This problem is addressed in many commercial products by adding a protective coating. Nickel plating or two-layered copper-nickel plating is the standard methods, although plating with other metals or polymer and lacquer protective coatings is also in use.

 

­The biggest and most important component in an MRI system is the strong magnet...


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