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Electroplating and spraying composite protection method of neodymium iron boron magnet

A neodymium-iron-boron and magnet technology, which is applied to magnetic objects, devices that coat the surface with liquid, circuits, etc. Iron boron magnets, etc., to achieve the effect of long service life, reduced emissions, and improved corrosion resistance

Inactive Publication Date: 2012-03-21
NINGBO YUNSHENG HIGH TECH MAGNETICS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] NdFeB magnets have excellent magnetic properties and high cost performance, and are widely used in technical fields such as electronics, motors and communications; however, NdFeB magnets are very active and are easily corroded, resulting in rust, pulverization or Problems such as loss of magnetism greatly limit the service life and application fields of NdFeB magnets; at present, the electroplating treatment on the surface of NdFeB magnets is mainly used to improve its anti-corrosion performance, although the electroplating layer isolates NdFeB magnets to a certain extent. The contact between the boron magnet and the external environment improves the corrosion resistance of the NdFeB magnet. However, due to the limitations of the electroplating process, there are more or less pores in the electroplating coating, and the external environment can contact the NdFeB magnet through these pores. , so as to corrode the NdFeB magnets; and the NdFeB magnets after electroplating can generally only withstand the neutral salt spray test for less than 96 hours, and cannot be used in hot and humid, highly corrosive working environments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: An electroplating and spraying composite protection method for NdFeB magnets, comprising the following steps:

[0019] (1) Pre-treat the NdFeB magnets for degreasing, derusting and activation. The process is as follows: alkaline degreasing (T=70°C, t=7min) → pure water washing → pure water washing → nitric acid pickling (concentration 5% , room temperature, t=1min)→pure water washing→pure water washing→ultrasonic water washing→pure water washing→ammonium bifluoride activation (concentration 15g / L, room temperature, t=30s)→pure water washing;

[0020] (2) Electroplating the pretreated NdFeB magnets: nickel is electroplated on the surface of NdFeB magnets, the thickness of the electroplating coating is 10-25 μm, and the electroplating temperature is 55 ° C. The nickel electroplating uses nickel sulfate solution, nickel sulfate The solution is mainly composed of nickel sulfate with a concentration of 330g / l, nickel chloride with a concentration of 50g / l, bori...

Embodiment 2

[0025] Embodiment 2: An electroplating and spraying composite protection method for NdFeB magnets, comprising the following steps:

[0026] (1) Pre-treat the NdFeB magnets for degreasing, derusting and activation. The process is as follows: alkaline degreasing (T=70°C, t=7min) → pure water washing → pure water washing → nitric acid pickling (concentration 5% , room temperature, t=1min)→pure water washing→pure water washing→ultrasonic water washing→pure water washing→ammonium bifluoride activation (concentration 15g / L, room temperature, t=30s)→pure water washing;

[0027] (2) Electroplating the pretreated NdFeB magnets: nickel is electroplated on the surface of NdFeB magnets, the thickness of the electroplating coating is 15-30 μm, and the electroplating temperature is 60 ° C. The nickel electroplating uses nickel sulfate solution, nickel sulfate The solution is mainly composed of nickel sulfate with a concentration of 330g / l, nickel chloride with a concentration of 50g / l, bori...

Embodiment 3

[0032] Embodiment 3: An electroplating and spraying composite protection method for NdFeB magnets, comprising the following steps:

[0033] (1) Pre-treat the NdFeB magnets for degreasing, derusting and activation. The process is as follows: alkaline degreasing (T=70°C, t=7min) → pure water washing → pure water washing → nitric acid pickling (concentration 5% , room temperature, t=1min)→pure water washing→pure water washing→ultrasonic water washing→pure water washing→ammonium bifluoride activation (concentration 15g / L, room temperature, t=30s)→pure water washing;

[0034] (2) Electroplating the pretreated NdFeB magnets: nickel is electroplated on the surface of NdFeB magnets, the thickness of the electroplating coating is 15-30 μm, and the electroplating temperature is 45 ° C. Nickel electroplating uses nickel sulfate solution, nickel sulfate The solution is mainly composed of nickel sulfate with a concentration of 330g / l, nickel chloride with a concentration of 50g / l, boric ac...

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Abstract

The invention discloses an electroplating and spraying composite protection method of a neodymium iron boron magnet, which comprises the following steps of: pretreatment of a neodymium iron boron magnet, electroplating treatment of the pretreated neodymium iron boron magnet, surface spraying of a corrosion-resistant coating on the electroplated neodymium iron boron magnet, procuring of the sprayed neodymium iron boron magnet, and curing of the procured neodymium iron boron magnet; the advantages are that the corrosion-resistant coating overcomes the pore defects of the electroplated layer; a new protective layer is formed outside the electroplated layer; dual protection of the neodymium iron boron magnet is formed by the corrosion-resistant coating and the electroplated layer; the corrosion resistance of the neodymium iron boron magnet is improved; compared with a neodymium iron boron magnet which is only treated by electroplating, the neodymium iron boron magnet which is compositely protected by electroplating and corrosion-resistant coating spraying has tolerance time in a neutral salt spray test that is increased by 2-6 times, long service life, high running reliability, and wide application fields.

Description

technical field [0001] The invention relates to a surface protection method of an NdFeB magnet, in particular to a composite protection method of electroplating and spraying for an NdFeB magnet. Background technique [0002] NdFeB magnets have excellent magnetic properties and high cost performance, and are widely used in technical fields such as electronics, motors and communications; however, NdFeB magnets are very active and are easily corroded, resulting in rust, pulverization or Problems such as loss of magnetism greatly limit the service life and application fields of NdFeB magnets; at present, the electroplating treatment on the surface of NdFeB magnets is mainly used to improve its anti-corrosion performance, although the electroplating layer isolates NdFeB magnets to a certain extent. The contact between the boron magnet and the external environment improves the corrosion resistance of the NdFeB magnet. However, due to the limitations of the electroplating process, ...

Claims

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Application Information

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IPC IPC(8): C25D5/00C25D3/12C25D3/22B05D7/14H01F41/00H01F1/057
Inventor 胡依群郑国芳曹立斌沈国迪
Owner NINGBO YUNSHENG HIGH TECH MAGNETICS
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