Surface processing agent for neodymium-iron-boron permanent magnet as well as preparation method and processing method thereof

A surface treatment agent, permanent magnet technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve problems affecting the application range of NdFeB permanent magnets, poor coating adhesion, and weak scratch resistance. and other problems, to achieve the effects of good appearance quality, improved film forming effect, and strong scratch resistance.

Active Publication Date: 2011-04-27
合肥华清高科表面技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many deficiencies in the existing surface treatment technology, which affect the application range of NdFeB permanent magnets, such as poor bonding force of the coating, high price, poor corrosion resistance, weak scratch resistance, etc.

Method used

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  • Surface processing agent for neodymium-iron-boron permanent magnet as well as preparation method and processing method thereof
  • Surface processing agent for neodymium-iron-boron permanent magnet as well as preparation method and processing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Take by weighing 10g sodium molybdate, 7g sodium permanganate, 3g sodium fluoride, 1.5g sodium metasilicate, 0.2g cerium nitrate, 0.1g carboxyethylthiourea;

[0033] (2) the sodium molybdate, sodium permanganate, sodium fluoride that are weighed are added in 200ml water respectively, fully stir to make semi-finished product processing solution after it dissolves completely;

[0034] (3) The sodium metasilicate, cerium nitrate, carboxyethylthiourea that weighed are added respectively in 200ml water, stir fully and mix with the semi-finished product processing liquid that step (2) makes after fully dissolving, fully stir to make it completely dissolved;

[0035] (4) Adding an appropriate amount of water to the volume of the treatment agent in the semi-finished treatment liquid obtained in step (3) is 1L, and adjusts the pH value to 1.5-2.5 with 98% sulfuric acid, so that the required treatment agent of the present invention can be obtained .

Embodiment 2

[0037] (1) Take by weighing 5g sodium molybdate and 6g potassium molybdate, 8g sodium permanganate, 3g sodium fluoride, 1g sodium metasilicate, 0.3g cerium nitrate, 0.2g carboxyethylthiourea;

[0038] (2) the sodium molybdate taken by weighing and potassium molybdate, sodium permanganate, sodium fluoride are added in 200ml water respectively, fully stir to make the semi-finished product treatment liquid after it dissolves completely for subsequent use;

[0039] (3) The sodium metasilicate, cerium nitrate, and carboxyethylthiourea that have been weighed are added in 200ml water respectively, fully stir and mix with the semi-finished product treatment liquid that step (2) makes after it is fully dissolved, fully stir to make its complete dissolution;

[0040] (4) Adding an appropriate amount of water to the volume of the treatment agent in the semi-finished treatment liquid obtained in step (3) is 1L, and adjusts the pH value to 1.5-2.5 with 98% sulfuric acid, so that the requir...

Embodiment 3

[0042] (1) Take by weighing 12g sodium molybdate, 4g sodium permanganate and 5g potassium permanganate, 4g sodium fluoride, 2g sodium metasilicate, 0.4g cerium nitrate, 0.3g carboxyethylthiourea;

[0043] (2) sodium molybdate, sodium permanganate and potassium permanganate, sodium fluoride being weighed are added in 200ml water respectively, fully stir and treat that it dissolves completely and make the semi-finished product treatment liquid for subsequent use;

[0044] (3) The sodium metasilicate, cerium nitrate, carboxyethylthiourea that weighed are added respectively in 200ml water, stir fully and mix with the semi-finished product treatment liquid that step (2) makes after it dissolves, fully stir to make it completely dissolved;

[0045] (4) Adding an appropriate amount of water to the volume of the treatment agent in the semi-finished treatment liquid obtained in step (3) is 1L, and adjusts the pH value to 1.5-2.5 with 98% sulfuric acid, so that the required treatment ag...

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Abstract

The invention discloses a surface processing agent for a neodymium-iron-boron permanent magnet as well as a preparation method and a processing method thereof. The surface processing agent for the neodymium-iron-boron permanent magnet of the invention comprises the following raw materials in proportion by weight (calculated by 1 liter in volume): 10-12g/L of molybdate, 7-9g/L of hypermanganate, 3-4g/L of sodium fluoride, 1-2g/L of auxiliary film-forming agent, 0.2-.04g/L of cerate, 0.1-0.3g/L of additive, a trace amount of pH regulator and the balance of water. The surface processing agent of the invention can be used for surface processing at normal temperature, the processing time is short, the permanent magnet obtained after processing has high surface corrosion-resisting property, good passivation-layer adhesive force and high scratch-resisting capability, and the invention is simple in processing process and convenient for practical operation.

Description

technical field [0001] The invention relates to a metal surface treatment agent, in particular to a surface treatment agent for NdFeB permanent magnets and a preparation method and treatment method thereof. Background technique [0002] NdFeB rare earth permanent magnet material is the third-generation permanent magnet material developed in the early 1980s. It is a permanent magnet material with the highest magnetic performance known so far. Functional materials have the advantages of high permanent magnetism, low price, high strength, and rich resource reserves. Once they came out, they quickly realized industrial scale production in just a few years. They have been widely used in microwave, audio, instrument, electrical engineering, Computers, magnetic separation, medical equipment and other fields have been widely used. Although NdFeB rare earth permanent magnet materials have the above advantages, due to the relatively high chemical activity of neodymium contained in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/44H01F1/057H01F41/00
Inventor 刘万青饶丹
Owner 合肥华清高科表面技术股份有限公司
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