Zinc impregnation agent for hot zincizing anticorrosion treatment of magnet powder
A technology of anti-corrosion treatment and powder, which is applied in the direction of solid-state diffusion coating, coating, metal material coating process, etc., can solve the problems of high rare earth content, complicated operation, low anti-corrosion ability of sherardizing layer, etc., and achieve the reduction of sherardizing Temperature, improve efficiency, improve the effect of anti-corrosion ability
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[0018] The preparation method of the above-mentioned zinc infiltration agent is to mix zinc, nickel, aluminum, rare earth (or rare earth alloy) with different components, put the mixed powder into a medium frequency induction furnace, melt at 380-800 ℃ and cast it into an alloy. , and then put the alloy into an organic solvent (preferably anhydrous ethanol or n-butanol) by ball milling or rod milling to make granular, and then use a sand mill to prepare it into a zinc alloy powder with a D50 of 0.02~1.8 microns for later use .
[0019] Fill the above-prepared sherardizing agent and the magnet whose surface roughness reaches the standard into the sherardizing device, and then place the filled sherardizing device in the heating device to heat up and carry out the sherardizing treatment. The specific conditions are: the temperature reaches When the temperature is 340~380℃, keep the temperature for 15~60 minutes to form a zinc-iron intermetallic compound on the surface of the magn...
Embodiment 1
[0024] First, put zinc, nickel, aluminum, and dysprosium according to weight percentages: nickel 0.05, aluminum, 0.01, dysprosium 0.02, and the rest are zinc, put them into an intermediate frequency induction furnace at 420 ° C, melt and cast into an alloy, and then put the alloy into anhydrous ethanol The ball mill or rod mill is used to make the powder into granules, and then it is prepared into powder with a D50 of 0.15 micron by a sand mill.
[0025] Polish 3.5kg of ¢24*¢15*18mm NdFeB permanent magnet material in a vibrating mill for 2 hours. After degreasing and degreasing by sodium phosphate 20g / liter, sodium carbonate 10g / liter, and sodium hydroxide 10g / liter, use 60-mesh white corundum, sandblasting and rust removal, and then surface cleaning (ultrasonic washing method) and rust-proof drying to obtain the surface For the permanent magnet material with roughness RA=0.6μm, mix the zinc alloy powder evenly, put it together with the magnet, heat it up to 380℃, keep it for ...
Embodiment 2
[0027] First, put zinc, nickel, aluminum, and dysprosium according to weight percentages: nickel 0.25, aluminum 0.05, dysprosium 0.01, and the rest are zinc, put them in an intermediate frequency induction furnace at 800 ° C, melt and cast into an alloy, and then put the alloy into anhydrous ethanol By ball milling or rod milling, it is made into granules, and then it is prepared into powder with D50 of 0.5 microns by a sand mill for later use.
[0028] Polish 3.5 kg of NdFeB permanent magnet material of ¢24*¢15*18mm for 2 hours according to the method of Example 1, use 60-mesh emery, nitric acid to remove rust, and then after surface cleaning (ultrasonic washing method) and rust-proof drying The permanent magnetic material with surface roughness RA=0.35μm is obtained, the zinc powder is mixed evenly and put together with the magnet, the temperature is raised to 350°C, kept for 60 minutes, taken out, removed, and passivated in a vibrating mill to obtain anti-corrosion The prop...
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