NdFeB magnetic powders surface modification by a fluid-bed electrodeposition
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Permanent magnets based on Nd2Fe14B compound are widely used in many applications, e.g. motors, electric and computer peripherals[1, 2, 3]. The main problems related with these and others applications are low temperature coefficients of remanence and coercivity as well as low corrosion resistance. The unacceptable corrosion behavior of NdFeB magnets derives from high Nd content and Nd-riched phase . Two methods are commonly applied to improve the magnets corrosion resistance: (1) coating of the bulk magnet and (2) alloy modifications. NdFeB magnets surface coated with Zn, Sn, Al, Ni, Cr, or Cu have good corrosion resistance [1, 4, 5]. In general, chemical or electronic deposition was widely applied for magnetic powders metallic surface coating. The chemical deposition layer was relatively loose and the thickness cannot be controlled effectively; most of all, it cannot deposit those metals whose electrode potential was negative than NdFeB substrate . The normally applied...
KeywordsCompressive Strength Coercive Force Coated Sample Metallic Layer Magnetic Powder
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