Method for preparing anti-corrosion wear-resisting sintered Nd-Fe-B magnets

An anti-corrosion and wear-resistant, NdFeB technology, applied in magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem of high surface energy, fatigue resistance, poor heat resistance and impact resistance, epoxy resin coating Layer brittleness and other problems, to achieve the effect of enhanced scratch resistance, corrosion resistance and wear resistance

Inactive Publication Date: 2014-08-20
EARTH PANDA ADVANCE MAGNETIC MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after EP curing, the crosslinking density is high, showing a three-dimensional network structure, large internal stress, brittle texture, poor fatigue resistance, heat resistance, and impact resistance, as well as low peel strength, low cracking strain capacity, and poor hea

Method used

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  • Method for preparing anti-corrosion wear-resisting sintered Nd-Fe-B magnets
  • Method for preparing anti-corrosion wear-resisting sintered Nd-Fe-B magnets

Examples

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Example Embodiment

[0024] Example 1

[0025] (1) Place the 42M sintered neodymium iron boron magnet blank in the degreasing liquid for surface degreasing, and the degreasing time is 15 minutes; the composition of the degreasing liquid is: sodium silicate 6g / L, sodium carbonate 12 g / L, Trisodium Phosphate·12H 2 O 16 g / L, OP emulsifier 2 g / L, sodium hydroxide 6 g / L, solvent is water.

[0026] (2) Put the degreasing product into a sandblasting machine for sandblasting. Select 150 mesh glass beads as the sandblasting material, the pressure is 0.3MPa, and the time is 20min;

[0027] (3) Put the blasted product into pure water for ultrasonic cleaning for 2 minutes;

[0028] (4) Phosphate the product after ultrasonic cleaning in a phosphating solution, the phosphating time is 15min; the composition of the phosphating solution is: manganese dihydrogen phosphate 20 g / L, zinc dihydrogen phosphate 40 g / L, zinc nitrate 50 g / L, sodium chloride 3 g / L, zinc oxide 3 g / L, and the solvent is water.

[0029] (5) After 5...

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Abstract

The invention discloses a method for preparing anti-corrosion wear-resisting sintered Nd-Fe-B magnets. The method includes the following steps that first, sintered Nd-Fe-B magnet blanks are placed in an oil removing solution so that oil on the surfaces of the sintered Nd-Fe-B magnet blanks can be removed, and sand blasting and ultrasonic cleaning are performed on the sintered Nd-Fe-B magnet blanks; second, phosphating is performed on the sintered Nd-Fe-B magnet blanks; third, the products subjected to phosphating and bottoming are immersed into an electrophoresis solution to be subjected to cathode electrophoresis; fourth, primary water washing, spraying and secondary water washing are performed sequentially, and dehydration is performed; fifth, softening braking, curing baking and cooling are sequentially performed. Through the method for preparing the novel sintered Nd-Fe-B magnets, a surface cathode electrophoresis epoxy resin/nano-SiO2 composite coating subjected to phosphating and bottoming is prepared. The corrosion resistance and the wear resistance of the composite coating are greatly improved compared with a traditional epoxy resin coating, and the scratch resistance of the coating can also be correspondingly enhanced.

Description

technical field [0001] The invention relates to the field of surface treatment of sintered NdFeB permanent magnet materials, in particular to the preparation of an anti-corrosion and wear-resistant coating for sintered NdFeB magnets. Background technique [0002] Sintered Nd-Fe-B (Nd-Fe-B) permanent magnets (a typical representative of rare earth Nd-Fe-B permanent magnets) permanent magnets are currently the best permanent magnet materials, and have been widely used in many fields such as motors, automobiles, and wind power generation. . However, this type of magnet has an obvious disadvantage, that is, the magnet has poor corrosion resistance, which seriously affects the further application of NdFeB permanent magnet materials. At present, there are two main methods for anti-corrosion treatment of NdFeB magnets: one is to add Al, Co, Cu, Ga and other alloying elements to improve the corrosion resistance of the material matrix, and the other is to use metal coatings, organic...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057
Inventor 张鹏杰吴玉程时宗华衣晓飞黄秀莲刘家琴熊永飞
Owner EARTH PANDA ADVANCE MAGNETIC MATERIAL
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