Method for preparing composite coating at surface of neodymium iron boron permanent magnet

A technology of surface compounding and permanent magnets, which is applied in the direction of coating, superimposed layer plating, metal material coating process, etc., can solve problems such as gaps, ion plating surface roughness, etc., to improve corrosion resistance and low production cost , The effect of simple preparation process

Inactive Publication Date: 2013-04-24
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surface of the ion plating layer is rough ...

Method used

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  • Method for preparing composite coating at surface of neodymium iron boron permanent magnet
  • Method for preparing composite coating at surface of neodymium iron boron permanent magnet
  • Method for preparing composite coating at surface of neodymium iron boron permanent magnet

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Embodiment 1

[0042] The preparation method of the composite coating on the surface of the NdFeB permanent magnet of this embodiment comprises the following steps:

[0043] Step 1. Surface pretreatment of NdFeB permanent magnets with a size of Φ15mm×3mm:

[0044] Step 101, using 400#, 600#, 800#, 1000# and 1200# sandpaper in sequence to polish the NdFeB permanent magnet;

[0045] Step 102, placing the polished NdFeB permanent magnet in step 101 in an ultrasonic cleaner filled with degreasing liquid for ultrasonic-assisted degreasing treatment; the temperature of the ultrasonic-assisted degreasing treatment is 75°C, and the The time for the ultrasonic-assisted degreasing treatment is 3min; the degreasing liquid is prepared by mixing sodium hydroxide, sodium carbonate, sodium pyrophosphate, OP-10 and deionized water, wherein the concentration of sodium hydroxide is 12g / L , the concentration of sodium carbonate is 45g / L, the concentration of sodium pyrophosphate is 55g / L, and the concentratio...

Embodiment 2

[0055] The preparation method of the composite coating on the surface of the NdFeB permanent magnet of this embodiment comprises the following steps:

[0056] Step 1. Surface pretreatment of NdFeB permanent magnets with a size of Φ20mm×3mm:

[0057] Step 101, using 400#, 600#, 800#, 1000# and 1200# sandpaper in sequence to polish the NdFeB permanent magnet;

[0058] Step 102, placing the polished NdFeB permanent magnet in step 101 in an ultrasonic cleaner filled with degreasing liquid for ultrasonic-assisted degreasing treatment; the temperature of the ultrasonic-assisted degreasing treatment is 70°C, and the The time for the ultrasonic-assisted degreasing treatment is 5min; the degreasing liquid is prepared by mixing sodium hydroxide, sodium carbonate, sodium pyrophosphate, OP-10 and deionized water, wherein the concentration of sodium hydroxide is 15g / L , the concentration of sodium carbonate is 50g / L, the concentration of sodium pyrophosphate is 60g / L, and the concentratio...

Embodiment 3

[0066] The preparation method of the composite coating on the surface of the NdFeB permanent magnet of this embodiment comprises the following steps:

[0067] Step 1. Surface pretreatment of NdFeB permanent magnets with a size of Φ20mm×5mm:

[0068] Step 101, using 400#, 600#, 800#, 1000# and 1200# sandpaper in sequence to polish the NdFeB permanent magnet;

[0069] Step 102, placing the polished NdFeB permanent magnet in step 101 in an ultrasonic cleaner filled with degreasing liquid for ultrasonic-assisted degreasing treatment; the temperature of the ultrasonic-assisted degreasing treatment is 70°C, and the The time for the ultrasonic-assisted degreasing treatment is 5min; the degreasing liquid is prepared by mixing sodium hydroxide, sodium carbonate, sodium pyrophosphate, OP-10 and deionized water, wherein the concentration of sodium hydroxide is 15g / L , the concentration of sodium carbonate is 48g / L, the concentration of sodium pyrophosphate is 62g / L, the concentration of...

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Abstract

The invention provides a method for preparing a composite coating at surface of a neodymium iron boron permanent magnet. The method comprises the following steps of 1, carrying out surface pretreatment on the neodymium iron boron permanent magnet; 2, putting the neodymium iron boron permanent magnet into conversion processing liquid to convert, thereby obtaining a yttrium conversion coating at the surface of the neodymium iron boron permanent magnet; 3, carrying out sealing treatment in hole sealing solution; 4, activating in activate fluid; 5, putting into electroless plating solution to carry out electroless plating treatment, thereby finally obtaining a yttrium/nickel yttrium phosphorus composite coating at the surface of the neodymium iron boron permanent magnet. The method is simple in preparation process, long in service life of the conversion processing fluid and the electroless plating solution, low in treatment cost, simple and convenient to maintain, convenient to produce and wide in application prospect, and technological parameter is easy to control. The bonding property of the yttrium/nickel yttrium phosphorus composite coating prepared by the method disclosed by the invention and the neodymium iron boron permanent magnet is excellent, and the decay resistance of the neodymium iron boron permanent magnet can be obviously improved.

Description

technical field [0001] The invention belongs to the technical field of metal material surface chemical treatment, and in particular relates to a method for preparing a composite coating on the surface of an NdFeB permanent magnet. Background technique [0002] Since the invention of NdFeB rare earth permanent magnet materials in 1983, its chemical composition and manufacturing process have been continuously improved and improved, which has led to the continuous development of NdFeB permanent magnet materials and devices. Compared with other permanent magnet materials, NdFeB permanent magnets have the characteristics of high remanence, high magnetic energy product, high coercive force, and low manufacturing cost, and are widely used in computer disk drives, voice coil motors (VCM), nuclear magnetic resonance imaging Instruments, maglev vehicle systems, magnetic separation technology, wind turbines, electroacoustic devices, battery-driven tools, mobile phones, water treatment ...

Claims

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Application Information

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IPC IPC(8): C23C28/00C23C22/05C23C18/36
Inventor 王志华
Owner XIAN UNIV OF SCI & TECH
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