Method for electroplating surface of permanent magnet neodymium-iron-boron magnetic steel with copper-nickel alloy plating

A technology of neodymium iron boron and copper electroplating, which is applied in the direction of superimposed layer plating, metal material coating process, coating, etc., can solve the problems of poor aging of neodymium iron boron magnets, achieve optimized appearance, save costs, Does not affect the effect of anti-corrosion effect

Inactive Publication Date: 2016-11-16
YANTAI DONGXING MAGNETIC MATERIALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a method for electroplating copper-nickel coating on the surface of permanent magnet NdFeB magnets; mainly to solve the problem of poor aging of existing NdFeB magnets

Method used

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  • Method for electroplating surface of permanent magnet neodymium-iron-boron magnetic steel with copper-nickel alloy plating

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1, adopt the method for nickel plating in electroplating tank again after multi-arc ion plating copper plating in the present invention, step is as follows:

[0034] a. After degreasing and degreasing the surface of the permanent magnet NdFeB magnets, wash them in the overflowing pure water washing tank for 40 seconds to ensure that they are clean, then wash them with nitric acid with a mass fraction of 5%, and then wash them with pure water, and then ultrasonically remove the dust. , washed with water, washed with ultrasonic pure water, then dehydrated with alcohol with a mass fraction of more than 98%, and dried;

[0035] b. Dry the permanent NdFeB magnets dehydrated by alcohol in an oven at 60°C for 1 hour, and then put the permanent NdFeB magnets into a multi-arc ion coating machine;

[0036] c Vacuumize the vacuum chamber of the multi-arc ion coating machine to 7×10 -3 pa, close the grating valve, then pass in argon gas at 100L / min, and adjust the vacuu...

Embodiment 2

[0042] Example 2, the same as Example, the difference is that the mass fraction of nitric acid in step a is 4%; the oven temperature in step b is 80°C, and it is dried for 0.5h; the bias power supply in step c is 1200V; step d is more The vacuum in the arc ion coating machine is maintained at 8×10 - 1 pa, the current is maintained at 90A, electroplating for 0.5 hours; step e, the surface temperature of the part is lowered to 80°C, and the furnace door is opened; step f, sandblasting with 60-mesh glass beads for 20 minutes; step g, the nickel sulfate content in the bath is 400g / L, nickel chloride 40g / L, boric acid 40g / L, pH 5.0, current 50A.

Embodiment 3

[0043] Embodiment 3, with embodiment 1, difference is, the mass fraction of the nitric acid of a step is 4.5%; The oven temperature of b step is 50 ℃, dry 3.0h; The bias power supply of c step is 1000V; d step The vacuum in the multi-arc ion coating machine is maintained at 2×10 -1 pa, the current is maintained at 60A, electroplating for 2 hours; step e, the surface temperature of the part is lowered to 20°C and the furnace door is opened; step f, sandblasting with 300 mesh glass beads for 2 minutes; step g, the content of nickel sulfate in the bath is 250g / L, nickel chloride 50g / L, boric acid 50g / L, pH 3.5, current 20A.

[0044] By controlling the coating time to obtain coatings of different thicknesses, the NdFeB magnets with different thicknesses of coatings were subjected to neutral salt spray test, aging test and binding force test for comparison.

[0045] Table 1 Comparison results Thickness unit: μm

[0046]

[0047] The neutral salt spray test adopts the ISO 9227-...

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Abstract

The invention discloses a method for electroplating the surface of permanent magnet neodymium-iron-boron magnetic steel with copper-nickel alloy plating. The method is characterized in that the surface of the permanent magnet neodymium-iron-boron magnetic steel is plated with copper through a multi-arc ion plating device, wherein the purity of copper is 99.9% or above, and in the copper plating process, the current range is controlled to be 40 A to 90 A and the copper plating with the thickness being 1 micrometer to 20 micrometers is obtained; then, the abrasive blasting operation is conducted on the surface, and particles of the surface are reduced; copper-based electronickelling is conducted on the part subjected to abrasive blasting in a bright nickel tank, and therefore the copper-nickel alloy plating of the permanent magnet neodymium-iron-boron magnetic steel is obtained; and copper plating is conducted through multi-arc ion plating, the bottom nickel procedure is omitted, the anti-corrosion effect is not influenced while cost is saved, the ageing property is improved, and meanwhile the wear resistance of the part is improved and the appearance of the neodymium-iron-boron magnetic steel is optimized.

Description

Technical field: [0001] The invention relates to the technical field of surface anticorrosion of permanent magnet NdFeB magnets, in particular to a method for electroplating a copper-nickel alloy coating on the surface of permanent magnet NdFeB magnets. Background technique: [0002] The chemical properties of permanent NdFeB magnets are extremely active, and the Nd-rich phase in the grain boundaries is prone to grain boundary corrosion. In addition, sintered NdFeB magnets have high porosity, loose materials, and poor surface conditions, so the requirements for anti-corrosion are extremely high. [0003] The traditional nickel-plating of NdFeB magnets generally adopts nickel-copper-nickel process. Due to the large gap of nickel, a dense copper layer is plated before the outer nickel to improve anti-corrosion performance; due to the potential difference of NdFeB material and copper The difference is not big, and it is difficult to directly plate copper on the parts, so a laye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/02C23C14/02C23C14/16C23C14/32C23C14/58C25D3/12
CPCC23C28/023C23C14/022C23C14/16C23C14/32C23C14/5886C25D3/12
Inventor 王洪杰陈德金谢长波
Owner YANTAI DONGXING MAGNETIC MATERIALS INC
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