Anti-corrosion treatment method for sintered NdFeB permanent magnet
A processing method and technology of permanent magnets, which are applied in the manufacture of permanent magnets, inductors/transformers/magnets, solid-state diffusion coatings, etc., to achieve the effects of easy popularization and application, simple operation process, and good corrosion resistance.
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Embodiment 1
[0024] Grind 3.5kg of ¢24*¢15*18mm NdFeB permanent magnet material in a vibration mill for 2 hours. After degreasing and degreasing with sodium phosphate 20g / liter, sodium carbonate 10g / liter and sodium hydroxide 10g / liter, use 60-mesh white corundum, sandblasting and derusting, and then surface cleaning (ultrasonic washing method) and antirust drying to obtain the surface For permanent magnet materials with roughness RA=0.6μm, 96 parts of zinc powder (weight ratio) and 4 parts of rare earth powder dysprosium are processed by high-energy ball milling, and D50 is 0.15 microns. After mixing evenly, put it together with the magnet, raise the temperature to 380°C, keep it for 15 minutes, take it out, remove the light in a vibration mill, and passivate it. The properties of the anti-corrosion NdFeB permanent magnet material are shown in Table 1.
Embodiment 2
[0026] Polish 3.5 kg of ¢24*¢15*18mm NdFeB permanent magnet material according to the method of Example 1 for 2 hours, use 60 mesh corundum, derust with nitric acid, and then clean the surface (ultrasonic water washing method) and dry for antirust 5微米。 To obtain a permanent magnet material with a surface roughness RA=0.35μm, zinc powder (weight ratio) 99 parts, rare earth powder terbium 1 part, through high-energy ball milling, wherein D50 is 0.5 microns. After mixing evenly, put it together with the magnet, raise the temperature to 350°C, keep it for 60 minutes, take it out, remove the light in a vibration mill, and passivate it. The properties of the anti-corrosion NdFeB permanent magnet material are shown in Table 1.
Embodiment 3
[0028] Polish 3.5 kg of ¢24*¢15*18mm NdFeB permanent magnet material according to the method of Example 1, sand blast and derust, use 80 mesh brown corundum, and then clean the surface (ultrasonic water washing method) and rust-proof and dry To obtain a permanent magnet material with a surface roughness RA=0.4 μm, 98 parts of zinc powder (weight ratio), 1 part of rare earth powder dysprosium, and 1 part of metal terbium are processed by high-energy ball milling, wherein D50 is 3 microns. After mixing evenly, put it together with the magnet, raise the temperature to 380°C, keep it for 45 minutes, take it out, remove the light in a vibration mill, and passivate it. The properties of the anti-corrosion NdFeB permanent magnet material are shown in Table 1.
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