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Preparation method for corrosion-resistant protective coating on surface of sintered neodymium-iron-boron magnet

A kind of protective coating, NdFeB technology, applied in the direction of coating, metal material coating process, melting spray plating, etc., can solve the problem of waste water heavy metal harming the environment and operators, the electroplating process energy consumption is large, the performance of the magnet is reduced, etc. , to achieve the effect of rapid cleaning in the preparation process, long-lasting corrosion resistance and wear resistance, and improved roughness

Active Publication Date: 2021-05-14
天津京磁电子元件制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The magnet is usually protected by adjusting the alloy composition of the magnet or by spraying and electroplating, but the adjustment of the composition brings about a decrease in the performance of the magnet. The electroplating process is also prone to corrosion in extreme environments due to the pores between the coatings, or due to the coating. There are potential safety hazards in the phenomenon of peeling and peeling due to weak bonding with the substrate, and the electroplating process consumes a lot of energy, and the heavy metals in the generated wastewater endanger the environment and operators. Corrosion Resistance of Sintered NdFeB

Method used

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  • Preparation method for corrosion-resistant protective coating on surface of sintered neodymium-iron-boron magnet

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Effect test

Embodiment 1

[0026] A method for preparing a corrosion-resistant protective coating on the surface of a sintered NdFeB magnet, comprising:

[0027] Step 1. Pretreatment of NdFeB magnets: select thin-sheet NdFeB magnets with specifications of 62mm×52mm×45mm for testing, place NdFeB magnets in distilled water, add metal cleaning solution, and then ultrasonically clean them for 10 minutes to remove the surface Oily dirt, then take out the NdFeB magnet and wash it with distilled water, then pickle the NdFeB magnet to remove the surface scale, the pickling solution used for pickling is nitric acid, its concentration is 5wt%, and the pickling time is 10s. After pickling, take it out and put it in clean water for ultrasonic cleaning, then wash it with distilled water and then soak it in ethanol. The purity of ethanol is 95%, and the ethanol soaking time is 30s. Finally, take it out and dry it, and sandblast it. The sandblasting material is corundum sand , sandblasting air pressure 0.5MPa, sandbla...

Embodiment 2

[0031] A method for preparing a corrosion-resistant protective coating on the surface of a sintered NdFeB magnet, comprising:

[0032] Step 1. Pretreatment of NdFeB magnets: select thin-sheet NdFeB magnets with specifications of 62mm×52mm×45mm for testing, place NdFeB magnets in distilled water, add metal cleaning solution, and then ultrasonically clean them for 10 minutes to remove the surface Oily dirt, then take out the NdFeB magnet and wash it with distilled water, then pickle the NdFeB magnet to remove the surface scale, the pickling solution used for pickling is nitric acid, its concentration is 5wt%, and the pickling time is 15s. After pickling, take it out and put it in clean water for ultrasonic cleaning, then wash it with distilled water and then soak it in ethanol. The purity of ethanol is 95%, and the ethanol soaking time is 30s. Finally, take it out and dry it, and sandblast it. The sandblasting material is corundum sand , sandblasting air pressure 0.6MPa, sandbla...

Embodiment 3

[0047] The corrosion-resistant protective coating was prepared by the method of Example 2, and a thin-sheet NdFeB magnet with a specification of 62mm × 52mm × 45mm was selected for testing, and the weight of the magnet was weighed in advance. The coating is weighed again, and then the different spraying material consumptions used for the coating are calculated respectively, and the thickness of each layer of coating is the same as in Example 2 here.

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Abstract

The invention discloses a preparation method for a corrosion-resistant protective coating on the surface of a sintered neodymium-iron-boron magnet. The preparation method comprises the following steps: a first step of ultrasonically cleaning the neodymium-iron-boron magnet and performing acid-pickling pretreatment to remove oil strains and oxide skin on the surface, and performing sand-blasting treatment on the neodymium-iron-boron magnet; a second step of spraying Ni-based composite powder and Cu-based composite powder to the surface of the neodymium-iron-boron magnet through a supersonic-speed flame spraying method. The preparation method adopts the Ni-based composite powder and the Cu-based composite powder as a spraying material, and is combined with a multilayer spraying process to achieve better corrosion resistance effect.

Description

technical field [0001] The invention relates to surface corrosion and protection of rare earth permanent magnet materials. More specifically, the invention relates to a method for preparing a corrosion-resistant protective coating on the surface of a sintered NdFeB magnet. Background technique [0002] Sintered NdFeB is a kind of rare earth permanent magnet material manufactured by powder metallurgy process principle. Because of its high remanence, high coercive force, high magnetic energy product, small size, light weight and other advantages, it has high industrial application value and is widely used. And wind power, rail transit, automobiles and ships, aerospace, consumer electronics, drones and other industrial manufacturing and equipment fields. However, due to the particularity of NdFeB rare earth materials that are easy to oxidize and the limitations of their preparation process, the magnet structure is loose and porous, and electrochemical corrosion or intergranula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/129C23C4/08C23C4/02
CPCC23C4/129C23C4/08C23C4/02
Inventor 孙浩马明国王松何昌龙
Owner 天津京磁电子元件制造有限公司
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