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NdFeB antirust paper and preparation method thereof

A neodymium iron boron and anti-rust paper technology, applied in papermaking, paper coatings, textiles and papermaking, etc., can solve the problems of poor temperature characteristics, drug residues of anti-rust agents, easy corrosion, etc., and achieve the effect of prolonging the anti-rust time

Inactive Publication Date: 2017-03-22
SHANGHAI SANTAI WRAPPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the Curie temperature point is low, the temperature characteristics are poor, the material contains a large amount of neodymium and iron, and it is easy to powder, easy to corrode, and easy to oxidize and rust. It must be improved by adjusting its chemical composition and adopting surface treatment methods. , in order to meet the requirements of practical application
[0003] In the prior art, in order to prevent oxidation and corrosion of NdFeB high-magnetization metals, surface phosphating and passivation treatment are usually carried out on the surface first, the purpose is to form an oxidation protective film on the metal surface, which will cause damage to NdFeB Primary protective effect, but because the protective layer is not airtight, when the storage environment temperature and humidity are high or the storage time is prolonged, the moisture in the space will still penetrate into the gap of the protective layer, which will also cause corrosion and oxidation of NdFeB. The protection period of the method is usually 1-2 months
Moreover, metal oxidation and rust is an electrochemical reaction caused by moisture. NdFeB metal has undergone high magnetization treatment, and the potential reaction on the surface is more intense. Therefore, although the use of conventional anti-rust paper does not produce oxidation and corrosion, it will cause it due to excessive reaction. Drug residues that will form rust inhibitors on the surface of NdFeB metal
[0004] In the prior art, the usual anti-rust packaging materials cannot play the role of anti-rust and anti-oxidation for the storage of NdFeB highly magnetized metals. Conventional anti-rust packaging materials are nothing more than anti-rust film and anti-rust paper, but due to NdFeB metal has high magnetization, and the use of anti-rust film will cause dangerous operation due to the smoothness of plastic

Method used

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  • NdFeB antirust paper and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 A kind of NdFeB antirust paper and its preparation method

[0029] A kind of neodymium-iron-boron antirust paper, the neodymium iron boron antirust agent that it uses comprises the raw material of following parts by weight: capric acid 12g, cyclohexylamine 10g, methyl alcohol 25g, benzotriazole 3g, ammonium benzoate 30g, sodium benzoate 24g.

[0030] Wherein, the ratio of parts by weight of capric acid to cyclohexylamine is 1.2:1.

[0031] The method for the above-mentioned NdFeB antirust paper, it is carried out according to the following sequence of steps:

[0032] (1) capric acid and cyclohexylamine are mixed to prepare solution a for use;

[0033] (2) Using methanol as a solvent, the solution a is prepared as a solution b with a concentration of 35%;

[0034] (3) Add benzotriazole to solution b, configure solution c with a concentration of 40%, and set aside;

[0035] (4) adding ammonium benzoate into deionized water at 60°C, dissolving and preparing a...

Embodiment 2-6

[0040] Example 2-6 NdFeB antirust paper and its preparation method

[0041] Examples 2-6 are respectively a kind of NdFeB antirust paper and its preparation method, which are similar to the raw materials and preparation method of Example 1, except that the technical parameters in the amount used are different, as shown in the following table :

[0042]

[0043] The products prepared in Examples 2-6 can be used at -10-65° C. and relative humidity below 95%, and the anti-rust effect can be maintained for 3-6 months.

Embodiment 7

[0044] Embodiment 7 The experiment of high temperature resistance and high humidity of the product obtained in embodiment 1-6

[0045] Since the NdFeB magnet is oxidized to potential oxidation and rust, the iron ions on the metal surface are combined with oxygen to cause the rust oxidation reaction through the potential flow generated by the moisture in the air.

[0046] Adopt the product obtained in embodiment 1-6 to carry out high humidity, high and low temperature thermal shock test experiment, the surface of neodymium boron ferromagnet is packed with the antirust paper obtained in embodiment 1-6, after It is placed in a test environment with a temperature of 50°C and a humidity of 95% for 8 hours, and then cooled to 0°C and a test environment with a humidity of 95% for 4 hours. This process is 12 hours as a cycle, and one day is two cycles. Cycle for 15 days, then test. Open the antirust wrapping paper on the surface of the NdFeB magnet, and no rust, oxidation and defects...

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PUM

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Abstract

The invention discloses a neodymium-iron-boron antirust paper and a preparation method thereof. According to the invention, by using combined synergistic effect of benzotriazole, additives and the like, neodymium-iron-boron metal surface can be prevented from rusting; and ammonium benzoate can form an ammonia adhesive layer on the neodymium-iron-boron metal surface, so the contact of neodymium-iron-boron metals and air is blocked, and antirust effect can be exerted on the neodymium-iron-boron metals under double actions. Meanwhile, the prepared neodymium-iron-boron antirust paper in the invention can be used at the temperature of minus 10 to 65 DEG C and in relative humidity of lower than 95%, and has antirust effect capable of maintaining for 3 to 6 months, so compared with a conventional antirust method, antirust time is greatly prolonged. The invention is suitable for rust prevention of the neodymium-iron-boron metals.

Description

technical field [0001] The invention belongs to the field of rust prevention, and relates to a rust-proof paper and a preparation method thereof, in particular to a neodymium-iron-boron rust-proof paper and a preparation method thereof. Background technique [0002] NdFeB permanent magnet is a high-tech material of the national 863 project plan. What it can produce is a biomagnetic field that simulates the characteristics of the human body's magnetic field, and is a stable iron-boron magnetic material. NdFeB magnetic material is an alloy composed of neodymium, iron oxide, etc., also known as magnetic steel. NdFeB has extremely high magnetic energy product and coercive force. The advantages of NdFeB are high cost performance and good mechanical properties. Magnetic separator, motor generator and audio equipment are three aspects, among which generator and motor are It will be the most widely used in the future, including electric vehicles, wind turbines, elevators, cranes a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/38D21H19/14
Inventor 吴炳璋
Owner SHANGHAI SANTAI WRAPPER