Corrosion-resistant coating on surface of sintered neodymium-iron-boron magnet and preparation method of surface corrosion-resistant coating
A technology of NdFeB and corrosion resistance, which is applied in the field of corrosion resistance coating on the surface of sintered NdFeB magnets and its preparation, can solve the problems of corrosion resistance, brittleness resistance and insulation effects, and achieve excellent bonding performance, Uniform structure distribution and improved surface corrosion resistance
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[0026] Example 1
[0027] The sintered NdFeB magnet with surface micro-arc oxidation obtained in Comparative Example 1 was put into a pulse plasma explosion treatment device, and the sintered NdFeB magnet was surface treated by a pulse plasma explosion treatment process and then dried naturally to obtain a surface containing Sintered neodymium iron boron magnets with dense micro-arc oxidation ceramic coating; the plasma explosion treatment device adopts pure tungsten electrodes, the power supply voltage is 5 KV, the working capacitance value is 800 μF, and the number of pulses is 3; the pulse plasma explosion treatment device The mixture of propane, oxygen and compressed air is used as the explosive gas, and the ratio of propane, oxygen and compressed air is 1: 4: 3.5; pure tungsten material is used as the electrode to detonate, and the explosive gas is sprayed from the spray gun Perform surface treatment on the test piece. The distance between the spray gun outlet and the surfac...
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[0032] Example 2
[0033] The sintered NdFeB magnet with surface micro-arc oxidation obtained in Comparative Example 1 was put into a pulse plasma explosion treatment device, and the sintered NdFeB magnet was surface treated by a pulse plasma explosion treatment process and then dried naturally to obtain a surface containing Sintered neodymium iron boron magnets with dense micro-arc oxidation ceramic coating; the plasma explosion treatment device adopts pure tungsten electrodes, the power supply voltage is 5 KV, the working capacitance value is 800 μF, and the number of pulses is 3; the pulse plasma explosion treatment device The mixture of propane, oxygen and compressed air is used as the explosive gas, and the ratio of propane, oxygen and compressed air is 1: 4: 3.5; pure tungsten material is used as the electrode to detonate, and the explosive gas is sprayed from the spray gun Perform surface treatment on the test piece. The distance between the spray gun outlet and the surfac...
Example Embodiment
[0038] Example 3
[0039] The sintered NdFeB magnet with surface micro-arc oxidation obtained in Comparative Example 1 was put into a pulse plasma explosion treatment device, and the sintered NdFeB magnet was surface treated by a pulse plasma explosion treatment process and then dried naturally to obtain a surface containing Sintered neodymium iron boron magnets with dense micro-arc oxidation ceramic coating; the plasma explosion treatment device adopts pure tungsten electrodes, the power supply voltage is 5 KV, the working capacitance value is 1000 μF, and the number of pulses is 2; the pulse plasma explosion treatment device The mixture of propane, oxygen and compressed air is used as the explosive gas, and the ratio of propane, oxygen and compressed air is 1: 4: 3.5; pure tungsten material is used as the electrode to detonate, and the explosive gas is sprayed from the spray gun Perform surface treatment on the test piece. The distance between the spray gun outlet and the surfa...
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