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A corrosion-resistant multi-coated NdFeB and its preparation process

A preparation process, NdFeB technology, applied in metal material coating process, inductor/transformer/magnet manufacturing, coating and other directions, can solve the problems of poor corrosion resistance and oxidation resistance, and ensure uniformity and smoothness. degree, improve corrosion resistance, and ensure the effect of thickness

Active Publication Date: 2018-08-17
宁波元辰新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a corrosion-resistant multi-coated NdFeB and its preparation process, which aims at the problems of poor corrosion resistance and oxidation resistance of existing NdFeB sintered permanent magnets, and prepares a strong corrosion-resistant, A multi-coated NdFeB permanent magnet with good wear resistance, and a preparation process for the multi-coated NdFeB

Method used

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  • A corrosion-resistant multi-coated NdFeB and its preparation process

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Experimental program
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Effect test

Embodiment 1

[0026] A preparation process for corrosion-resistant multi-coated NdFeB, comprising the steps of:

[0027] (1) Pretreatment, add 500ml of dilute nitric acid with a concentration of 0.5mol / L and 500ml of 0.5g / L thiourea to prepare pickling solution, place the NdFeB permanent magnet in the acid solution for cleaning for 2-3min, and then place Ultrasonic cleaning in 500mL of absolute ethanol for 1-2min, after completion, place in 500ml of 20g / L sulfosalicylic acid and 500ml of 10g / L ammonium bifluoride mixture for activation, activation time 1min, activation temperature 25°C ;

[0028] (2) Electroless nickel plating, take by weighing the 26g / L nickel sulfate hexahydrate solution of 300ml, the sodium hypophosphite solution of the 30g / L of 300ml, the borax solution of the 30g / L of 100ml, the sodium citrate of the 30g / L of 100ml solution, 100ml of 30g / L ammonium fluoride solution, and 100ml of 3g / L succinic acid solution to prepare the chemical plating solution, place the pretreate...

Embodiment 2

[0032] A preparation process for corrosion-resistant multi-coated NdFeB, comprising the steps of:

[0033](1) Pretreatment, add 500ml of dilute nitric acid with a concentration of 1.0mol / L and 500ml of 0.5g / L thiourea to prepare pickling solution, place the NdFeB permanent magnet in the acid solution for cleaning for 2-3min, and then place Ultrasonic cleaning in 500mL of absolute ethanol for 1-2min, after completion, place in 500ml of 20g / L sulfosalicylic acid and 500ml of 10g / L ammonium bifluoride mixture for activation, activation time 1min, activation temperature 25°C ;

[0034] (2) Electroless nickel plating, take by weighing the 26g / L nickel sulfate hexahydrate solution of 300ml, the sodium hypophosphite solution of the 30g / L of 300ml, the borax solution of the 30g / L of 100ml, the sodium citrate of the 30g / L of 100ml solution, 100ml of 30g / L ammonium fluoride solution, and 100ml of 3g / L succinic acid solution to prepare the chemical plating solution, place the pretreated...

Embodiment 3

[0038] A preparation process for corrosion-resistant multi-coated NdFeB, comprising the steps of:

[0039] (1) Pretreatment, add 500ml of dilute nitric acid with a concentration of 0.8mol / L and 500ml of 0.5g / L thiourea to prepare pickling solution, place the NdFeB permanent magnet in the acid solution for cleaning for 2-3min, and then place Ultrasonic cleaning in 500mL of absolute ethanol for 1-2min, after completion, place in 500ml of 20g / L sulfosalicylic acid and 500ml of 10g / L ammonium bifluoride mixture for activation, activation time 1min, activation temperature 25°C ;

[0040] (2) Electroless nickel plating, take by weighing the 26g / L nickel sulfate hexahydrate solution of 300ml, the sodium hypophosphite solution of the 30g / L of 300ml, the borax solution of the 30g / L of 100ml, the sodium citrate of the 30g / L of 100ml solution, 100ml of 30g / L ammonium fluoride solution, and 100ml of 3g / L succinic acid solution to prepare the chemical plating solution, place the pretreate...

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Abstract

The invention provides corrosion-resistant multi-coating neodymium iron boron and a preparation process. The corrosion-resistant multi-coating neodymium iron boron is composed of a neodymium iron boron permanent magnet and multiple coatings arranged on the outer surface of the neodymium iron boron permanent magnet, the multiple coatings sequentially include a nickel-plated layer, a dysprosium-plated aluminum alloy thin film layer and a nickel-chromium composite coating, thickness of the nickel-plated layer is 10-15um, thickness of the dysprosium-plated aluminum alloy thin film layer is 10-20um, and thickness of the nickel-chromium composite coating is 6-10um; modification of the multiple coatings can be realized on the surface of the permanent magnet, binding strength between the coatings and a permanent magnet base is guaranteed, the defect that the coatings are thin and poor in corrosion resistance and wear resistance caused by single process is overcome, and the corrosion-resistant multi-coating neodymium iron boron prepared by the process has high corrosion resistance and wear resistance.

Description

technical field [0001] The invention relates to the field of permanent magnet materials, in particular to a corrosion-resistant multi-coated NdFeB permanent magnet material and a preparation process thereof. Background technique [0002] As the third-generation permanent magnet material, NdFeB has been widely used in microwave technology, audio-visual technology, electrical engineering, instrument technology, computer technology, magnetic separation technology, automobile industry and other fields due to its excellent magnetic properties and low price. With the thawing of sintered NdFeB patented technologies in Japan, Germany, and the European Union, and the concerted efforts of major sintering manufacturers in my country, the grade of sintered NdFeB products has also been greatly improved. At the same time, with the further promotion of NdFeB as a high-tech application field, the comprehensive performance requirements of its products are also continuously improved, especial...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02C23C28/02
CPCC23C28/021H01F1/057H01F41/026
Inventor 贝振军
Owner 宁波元辰新材料有限公司
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