Electroplating and vapor deposition composite protection method for neodymium-iron-boron magnet

A vapor deposition, NdFeB technology, applied in the manufacture of permanent magnets, superimposed layer plating, sputtering and other directions, can solve the problems of NdFeB magnet damage, corrosion NdFeB magnet, magnetic performance decline and other problems, Achieve the effect of improving corrosion resistance, reducing emissions, and long service life

Inactive Publication Date: 2013-06-26
NINGBO YUNSHENG +3
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Although the electroplating coating isolates the contact between the NdFeB magnet and the external environment to a certain extent, and improves the corrosion resistance of the NdFeB magnet, but due to the limitations of the electroplating process, there are the following problems: 1. The electroplating coating is more or less There are pores, and the external environment can contact the NdFeB magnets through these pores, thereby corroding the NdFeB magnets; 2. The surface of the NdFeB magnet itself has a microporous structure. When the NdFeB magnets are directly electroplated, the electroplating The liquid medicine will penetrate into the NdFeB magnet through the microporous structure and cause damage to the NdFeB magnet, causing a decline in magnetic properties
As a result, my country's precious heavy rare earth metals such as dysprosium and terbium or strategic metal cobalt were consumed, resulting in a waste of resources

Method used

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  • Electroplating and vapor deposition composite protection method for neodymium-iron-boron magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: A composite protection method of electroplating and vapor deposition for NdFeB magnets, comprising the following steps:

[0018] ① Pretreatment of NdFeB magnets, including degreasing, rust removal and activation, the specific process is as follows:

[0019] ①-1 Alkaline degreasing (degreasing) of NdFeB magnets at a temperature of 50-70 °C for 5-15 minutes;

[0020] ①-2 Wash the degreased NdFeB magnet twice with pure water;

[0021] ①-3 Pickling with 5% nitric acid pickling solution at room temperature for 1 to 3 minutes (rust removal);

[0022] ①-4 wash with pure water twice;

[0023] ①-5 for ultrasonic washing;

[0024] ①-6 for pure water washing;

[0025] ①-7 Use ammonium bifluoride solution with a concentration of 15g / L for activation treatment, wherein the temperature is room temperature and the time is 30 seconds;

[0026] ①-8 is washed with pure water, and the pretreatment is completed;

[0027] ②The pretreated NdFeB magnet is subjected to vapo...

Embodiment 2

[0030] Embodiment 2: A composite protection method of electroplating and vapor deposition for NdFeB magnets, comprising the following steps:

[0031] ① Pretreatment of NdFeB magnets, including degreasing, rust removal and activation, the specific process is as follows:

[0032] ①-1 Alkaline degreasing (degreasing) of NdFeB magnets at a temperature of 50-70 °C for 5-15 minutes;

[0033] ①-2 Wash the degreased NdFeB magnet twice with pure water;

[0034] ①-3 Pickling with 5% nitric acid pickling solution at room temperature for 1 to 3 minutes (rust removal);

[0035] ①-4 wash with pure water twice;

[0036] ①-5 for ultrasonic washing;

[0037] ①-6 for pure water washing;

[0038] ①-7 Use ammonium bifluoride solution with a concentration of 15g / L for activation treatment, wherein the temperature is room temperature and the time is 30 seconds;

[0039] ①-8 is washed with pure water, and the pretreatment is completed;

[0040] ②The pretreated NdFeB magnet is subjected to vapo...

Embodiment 3

[0043] Embodiment 3: A composite protection method of electroplating and vapor deposition for NdFeB magnets, comprising the following steps:

[0044] ① Pretreatment of NdFeB magnets, including degreasing, rust removal and activation, the specific process is as follows:

[0045] ①-1 Alkaline degreasing (degreasing) of NdFeB magnets at a temperature of 50-70 °C for 5-15 minutes;

[0046] ①-2 Wash the degreased NdFeB magnet twice with pure water;

[0047] ①-3 Pickling with 5% nitric acid pickling solution at room temperature for 1 to 3 minutes (rust removal);

[0048] ①-4 wash with pure water twice;

[0049] ①-5 for ultrasonic washing;

[0050] ①-6 for pure water washing;

[0051] ①-7 Use ammonium bifluoride solution with a concentration of 15g / L for activation treatment, wherein the temperature is room temperature and the time is 30 seconds;

[0052] ①-8 is washed with pure water, and the pretreatment is completed;

[0053] ②The pretreated NdFeB magnet is subjected to vapo...

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Abstract

The invention discloses an electroplating and vapor deposition composite protection method for a neodymium-iron-boron magnet. The method comprises the steps of: pretreating the neodymium-iron-boron magnet, carrying out vapor deposition treatment on the pretreated neodymium-iron-boron magnet, and carrying out surface electroplating treatment on the neodymium-iron-boron magnet obtained from the vapor deposition treatment. The protection method disclosed by the invention has the advantages that the vapor deposition film layer formed beforehand closes the cellular structure on the surface of the neodymium-iron-boron magnet and does not cause damage on the neodymium-iron-boron magnet to lead magnetic performance reduction, and therefore, heavy rare earth metals such as dysprosium and terbium or the strategic metal cobalt can be rarely added or not added in the material formulation of the neodymium-iron-boron magnet, so that scarce resources are saved, simultaneously, the vapor deposition film layer can block the subsequent corrosion path on the neodymium-iron-boron magnet caused by an electroplating solution, and can also overcome the pore defect of an electroplated coating so that an external environment cannot contact with the neodymium-iron-boron magnet through the pores of the electroplated coating, and the corrosion resistance of the neodymium-iron-boron magnet is improved through the double protection of the vapor deposition film layer and the electroplated coating.

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 vapor deposition 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. [0003] At present, the anti-corrosion performance of NdFeB magnets is mainly improved by electroplating the surface. Although the electroplating coating isolates the contact between the NdFeB magnet and the external environment to a certain extent, and improves the corrosion resistance of the NdFeB magnet, but due to the limitations of the electroplating process, there are the fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00
CPCC23C14/021C23C14/16C23C14/58C23C28/021C23C28/023C23C28/025C25D5/34C25D7/001H01F41/026
Inventor 胡依群郑国芳鲍盈王应发徐治伟
Owner NINGBO YUNSHENG
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