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Magnet surface treatment method and nickel plating method

A surface treatment and magnet technology, applied in jewelry and other directions, can solve the problem that the bonding force between the surface of the magnet and the nickel coating needs to be improved, and achieve the effect of enhanced adhesion

Pending Publication Date: 2021-10-08
BAOTOU TIANHE MAGNETICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The bonding force between the surface of the magnet and the nickel coating after activation by this method needs to be improved

Method used

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  • Magnet surface treatment method and nickel plating method
  • Magnet surface treatment method and nickel plating method

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1～2 and preparation comparative example 1～5

[0058] (1) The room temperature degreasing agent is prepared into a degreasing solution with a concentration of 5 wt%. 3 kg of 17×13.5×2.8 mm sintered NdFeB permanent magnets were ultrasonically degreased for 45 s, and then washed three times with water for a total of 45 s to obtain a degreased magnet.

[0059] (2) Pickling the magnet after degreasing in 4vol% nitric acid for 25s, then performing a second washing with a total of 30s; the magnet after the second washing was ultrasonically washed for 50s to obtain degreasing and pickling the magnet.

[0060] (3) Put the degreased and pickled magnet into the activation solution, and treat it at 30° C. for 15 seconds to obtain a surface-treated magnet; ultrasonically wash the surface-treated magnet for 50 seconds to obtain a magnet to be coated. The activation solution uses water as the solvent, and the composition of the solute is shown in Table 1.

[0061] Table 1

[0062]

Embodiment 1～2 and comparative example 1～5

[0064] The magnet to be coated is nickel-plated by drum electroplating. The electroplating solution is composed of nickel chloride 50g / L, nickel sulfate 250g / L, boric acid 50g / L, sodium dodecylsulfonate 0.05g / L and water. The pH of the plating solution is 4.5, the temperature of the plating solution is 50°C, and the current density is 0.4A / dm 2 , Plating time is 2h. The coating thickness is 10 μm.

[0065] The properties of the obtained nickel-plated magnets are shown in Table 2.

[0066] Table 2

[0067]

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Abstract

The invention discloses a magnet surface treatment method. The magnet surface treatment method comprises the following steps that a magnet subjected to oil removal and acid pickling is treated in an activating solution, and the magnet subjected to surface treatment is obtained, wherein the activating solution comprises 2-20 g / L of ammonium bifluoride, 2-20 g / L of sulfamic acid, 1-10 g / L of sodium chloride and 5-60 g / L of soluble inorganic aluminum salt. By adopting the method to treat the surface of the magnet, the binding force of the magnet and a coating can be improved. The invention further discloses a nickel plating method which can improve the binding force between the magnet and the nickel coating.

Description

technical field [0001] The invention relates to a magnet surface treatment method and a nickel plating method, in particular to a sintered NdFeB magnet surface treatment method and a nickel plating method. Background technique [0002] NdFeB magnets are widely used in communication, computer, military, medical and other fields because of their excellent magnetic properties. However, the corrosion resistance of NdFeB magnets is poor, which greatly limits the application of NdFeB magnets. At present, the coating protection technology is mainly used to improve the corrosion resistance of NdFeB magnets. [0003] CN104805413A discloses a method for preparing a surface coating of an NdFeB permanent magnet material. The method comprises the following steps: treating the surface of the NdFeB sintered magnet to make the surface of the magnet smooth and flat; degreasing the surface-treated NdFeB sintered magnet in an aqueous solution of sodium silicate; Ultrasonic cleaning in nitri...

Claims

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Application Information

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IPC IPC(8): C25D7/00C25D3/12C25D5/34
CPCC25D7/001C25D5/34C25D3/12
Inventor 张明鑫刘延斌曾庆业王宏雪董义袁易陈雅袁文杰
Owner BAOTOU TIANHE MAGNETICS TECH CO LTD