Investigation on the Interfacial Bonding Strength between Ni-P-W/Al<sub>2</sub>O<sub>3</sub> Composite Coatings and NdFeB Matrix

¹̄The Ni-P-W/Al 2 O 3 composite coatings were deposited on the NdFeB magnetic materials surface by electroless plating method. The morphology of Ni-P-W/Al 2 O 3 coatings was investigated using scanning electron microscopy. And the X-ray diffraction was used to identify the phase constituents. The interfacial bonding strength between Ni-P-W/Al 2 O 3 composite coatings and NdFeB matrix was also tested. The results indicated that the interfacial bonding strength is prone to be increased while the Al 2 O 3 powders co-deposited with Ni-P-W coatings. And the interfacial bonding strength would reach the highest value when the Al 2 O 3 concentration is in rang of 5gL -1 to 10gL -1 .