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Special surface treating agent for neodymium iron boron and application method of special surface treating agent

A surface treatment agent, NdFeB technology, applied in the coating process of metal materials, etc., can solve the problems of complex process, affecting the performance and life of NdFeB magnetic materials, poor corrosion resistance, etc.

Inactive Publication Date: 2015-03-25
泰伦特生物工程股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NdFeB magnetic materials contain a large amount of neodymium and iron. The chemical properties of the material are extremely active, and they are easily oxidized in a humid environment. Fluffy red powdery corrosion products appear on the surface, which damages the quality and appearance of the product and affects the neodymium. Performance and life of iron boron magnetic materials
[0003] At present, in order to improve the corrosion resistance of NdFeB magnetic materials at home and abroad, a lot of research has been done, such as the common pickling-passivation, pickling-phosphating, sealing holes after passivation with inorganic salts and other processes, among which the acid Dilute nitric acid is used for washing, and the cleaning time must be short, otherwise the dilute nitric acid will corrode the NdFeB magnetic material, resulting in excessive weight loss of the product, and phosphating can only play a temporary anti-rust and complicated process. In short, the existing anti-rust treatment The process has the disadvantages of high product weight loss and poor corrosion resistance after treatment

Method used

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  • Special surface treating agent for neodymium iron boron and application method of special surface treating agent
  • Special surface treating agent for neodymium iron boron and application method of special surface treating agent
  • Special surface treating agent for neodymium iron boron and application method of special surface treating agent

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preparation example Construction

[0043] The preparation method of the above-mentioned NdFeB special surface treatment agent comprises the following steps:

[0044] (1) Add zinc dihydrogen phosphate and manganese dihydrogen phosphate into water, heat to 50°C, and stir to dissolve;

[0045] (2) Continue to add nickel nitrate, sodium fluoride, and sodium nitrate, stir and dissolve, and keep the temperature at 50°C for 0.5h;

[0046] (3) After the above liquid is cooled to normal temperature, phosphoric acid, citric acid, phosphotungstic acid and sodium molybdate are added to it, stirred evenly and completely dissolved, and then the preparation is completed.

[0047] The method of using the above-mentioned special surface treatment agent for NdFeB comprises the following steps:

[0048] (1) Use an alkaline degreasing machine to degrease the surface of the NdFeB magnetic material, and then clean the excess residual alkaline degreasing machine with clean water;

[0049] (2) Treat the NdFeB surface with a colloida...

Embodiment 1

[0055]

[0056]

[0057] The units of the above components are grams.

[0058] The preparation method comprises the following steps:

[0059] (4) Add zinc dihydrogen phosphate and manganese dihydrogen phosphate into water, heat to 50°C, and stir to dissolve;

[0060] (5) Continue to add nickel nitrate, sodium fluoride, and sodium nitrate, stir and dissolve, and keep the temperature at 50°C for 0.5h;

[0061] After the above liquid is cooled to normal temperature, phosphoric acid, citric acid, phosphotungstic acid and sodium molybdate are added to it, stirred evenly and completely dissolved, and then the preparation is completed.

[0062] Surface treatment of NdFeB magnetic materials:

[0063] The material to be processed is the permanent magnet in the motor, and the equipment is soaked by an ultrasonic roller

[0064] The total acid point of the deionized solution of NdFeB special surface treatment agent is 40.2, and the free acid point is 7.1

[0065] (1) Use an alk...

Embodiment 2

[0071]

[0072] The units of the above components are grams. The preparation method is the same as in Example 1. Surface treatment of NdFeB magnetic materials:

[0073] The material to be processed is the permanent magnet in the motor, and the equipment is soaked by an ultrasonic roller

[0074] The total acid point of the deionized solution of NdFeB special surface treatment agent is 44.5, and the free acid point is 7.8

[0075] (1) Use an alkaline degreasing machine to degrease the surface of the NdFeB magnetic material, and then clean the excess residual alkaline degreasing machine with clean water;

[0076] (2) Treat the NdFeB surface with a colloidal titanium salt surface conditioner to form crystallization nuclei on the surface, laying a solid foundation for the next step to form a uniform and dense crystallization film on the surface;

[0077] (3) Dilute the NdFeB special surface treatment agent with deionized water to a 10% solution, then treat it at a temperatur...

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Abstract

The invention relates to a special surface treating agent for neodymium iron boron. The special surface treating agent is prepared from raw materials including zinc dihydrogen phosphate, manganese dihydrogen phosphate, nickel nitrate, sodium fluoride, sodium nitrate, phosphoric acid, citric acid, phosphotungstic acid and sodium molybdate. According to the special surface treating agent disclosed by the invention, all components are mixed with deionized water to obtain a finished product. When the special surface treating agent is in use, a neodymium iron boron magnetic material is put into an ultrasonic roller and is sequentially subjected to oil removal, washing, surface conditioning, treatment by the special surface treating agent for the neodymium iron boron, sealing and drying, wherein micro-rust on the surface is firstly removed; a uniform and compact protective film is formed on the surface; the treated neodymium iron boron magnetic material is small in weight loss; a saline soaking test proves that the treated neodymium iron boron magnetic material is better in corrosion resistance, and harms caused by acid pickling of a strong acid to the environment and operators are reduced.

Description

technical field [0001] The invention belongs to the technical field of NdFeB rust prevention, in particular to a special surface treatment agent for NdFeB and its application method. Background technique [0002] NdFeB magnetic material is an alloy of neodymium, iron oxide, etc., also known as magnetic steel, which has extremely high magnetic energy product and coercive force, and also has the characteristics of high energy density, making instruments, electroacoustic motors, Magnetic separation and magnetization and other equipment are miniaturized and lightweight, and are widely used in modern industries and electronic technologies such as energy, transportation, machinery, medical treatment, IT, and home appliance industries. NdFeB magnetic materials contain a large amount of neodymium and iron. The chemical properties of the material are extremely active, and they are easily oxidized in a humid environment. Fluffy red powdery corrosion products appear on the surface, whi...

Claims

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Application Information

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IPC IPC(8): C23C22/42
CPCC23C22/42
Inventor 李兰芳安同艳
Owner 泰伦特生物工程股份有限公司
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