Composite surface protecting method for neodymium-iron-boron magnet

A surface composite and NdFeB technology, which is applied in the manufacture of inductors/transformers/magnets, liquid chemical plating, coatings, etc., can solve the problem of shortening the corrosion protection period of the surface coating of NdFeB magnets and limiting the use of NdFeB magnets Life and application fields, corrosion of NdFeB magnets and other issues, to achieve long service life, reduce emissions, and improve corrosion resistance

Active Publication Date: 2012-03-07
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 N

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: a surface composite protection method of an NdFeB magnet, comprising the following steps:

[0024] (1) Pre-treat the NdFeB magnet with a round hole structure: degreasing → derusting → sealing;

[0025] (2) Phosphating the pretreated NdFeB magnet: immerse the pretreated NdFeB magnet in the phosphating solution, and form a phosphating film layer on the surface of the pretreated NdFeB magnet;

[0026] (3) Spray the corrosion-resistant coating on the surface of the phosphating NdFeB magnet: the thickness of the corrosion-resistant coating is 10-40 μm, and the composition and proportion (volume ratio) of the corrosion-resistant coating are: corrosion-resistant coating: The diluent is 1:8, and the diluent is butanone;

[0027] (4) Pre-curing the sprayed NdFeB magnet: drying at a temperature of 100°C for 30 minutes;

[0028] (5) Curing the pre-cured NdFeB magnet: drying at a temperature of 180°C for 60 minutes;

[0029] (6) Perform physical vapor deposition tr...

Embodiment 2

[0031] Embodiment 2: A surface composite protection method of an NdFeB magnet, comprising the following steps:

[0032] (1) Pre-treat the NdFeB magnet with a round hole structure: degreasing → derusting → sealing;

[0033] (2) Phosphating the pretreated NdFeB magnet: immerse the pretreated NdFeB magnet in the phosphating solution, and form a phosphating film layer on the surface of the pretreated NdFeB magnet;

[0034] (3) Spray the corrosion-resistant coating on the surface of the phosphating NdFeB magnet: the thickness of the corrosion-resistant coating is 10-40 μm, and the composition and proportion (volume ratio) of the corrosion-resistant coating are: corrosion-resistant coating: The diluent is 1:8, and the diluent is butanone;

[0035] (4) Pre-curing the sprayed NdFeB magnet: drying at a temperature of 150°C for 20 minutes;

[0036] (5) Curing the pre-cured NdFeB magnet: drying at 220°C for 20 minutes;

[0037] (6) Perform physical vapor deposition treatment on the cu...

Embodiment 3

[0039] Embodiment three: a surface composite protection method of an NdFeB magnet, comprising the following steps:

[0040] (1) Pre-treat the NdFeB magnet with a round hole structure: degreasing → derusting → sealing;

[0041] (2) Electroplating the pretreated NdFeB magnets: nickel is electroplated on the surface of NdFeB magnets, the thickness of the electroplating coating is 5-25 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, boric acid with a concentration of 40g / l, sodium lauryl sulfate with a concentration of 0.08g / l and water. The nickel sulfate solution The pH is 3.8;

[0042] (3) Spray the corrosion-resistant coating on the surface of the electroplated NdFeB magnet: the thickness of the corrosion-resistant coating is 5-20 μm, and the composition and proportion (volume ...

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Abstract

The invention discloses a composite surface protecting method for a neodymium-iron-boron magnet, comprising the following steps of: pretreating a neodymium-iron-boron magnet, electroplating or phosphating the pretreated neodymium-iron-boron magnet, spraying a corrosion-resistant coating on the surface of the electroplated neodymium-iron-boron magnet, pre-curing the sprayed neodymium-iron-boron magnet, curing the pre-cured neodymium-iron-boron magnet and performing vapour phase deposition on the cured neodymium-iron-boron magnet. The composite surface protecting method for the neodymium-iron-boron magnet has the following advantages that: the combining stability between the plating and the neodymium-iron-boron magnet and the corrosion-resistant property of the plating are improved by meansof the corrosion-resistant coating; the electroplating treatment and the spraying treatment are further enhanced by the vapour phase deposition; meanwhile, a circular hole structure of the neodymium-iron-boron magnet is further plated so that the integrated plating on the surface of the neodymium-iron-boron magnet is uniform; and the endurance time of the neutral salt spray test of the compoundedneodymium-iron-boron magnet can reach more than 300 hours.

Description

technical field [0001] The invention relates to a protection method for NdFeB magnets, in particular to a surface composite protection method for NdFeB magnets. 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, there are more or less pores in th...

Claims

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Application Information

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IPC IPC(8): H01F41/02C23C18/00
Inventor 胡依群郑国芳沈国迪欧阳习科
Owner NINGBO YUNSHENG HIGH TECH MAGNETICS
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