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Surface anticorrosion method of multifunctional neodymium-iron-boron permanent magnet

A NdFeB, multi-functional technology, applied in the field of NdFeB permanent magnet multi-layer nickel anti-corrosion, NdFeB permanent magnet material surface treatment field, can solve the problem of affecting the service life of NdFeB permanent magnet and reduce product stability and reliability, poor corrosion resistance of NdFeB alloys, etc., to achieve excellent deep plating ability, excellent throwing ability, and the effect of saving precious metal nickel

Active Publication Date: 2016-07-27
TIANJIN SANHUAN LUCKY NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rare earth element neodymium in the NdFeB powder alloy is active in nature, which makes the corrosion resistance of the entire NdFeB alloy very poor. It is easy to rust and corrode in a hot and humid environment, and the magnetic properties will be reduced or damaged due to corrosion failure. , which seriously affects the service life of NdFeB permanent magnets and reduces the stability and reliability of the product

Method used

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  • Surface anticorrosion method of multifunctional neodymium-iron-boron permanent magnet
  • Surface anticorrosion method of multifunctional neodymium-iron-boron permanent magnet

Examples

Experimental program
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Effect test

Embodiment 1

[0019] 3 kg of D12*4 sintered NdFeB permanent magnet materials were polished in a vibration mill for 3 hours. Use 10L degreasing agent, which is composed of 30g / liter sodium phosphate, 8g / liter sodium carbonate and 8g / liter sodium hydroxide. After degreasing and degreasing NdFeB permanent magnet materials, pickle them with 5% nitric acid solution The oxide on the surface of the NdFeB permanent magnet material is then washed with water for 3 times. Then use 5% sulfuric acid solution to activate the NdFeB permanent magnet material, and then perform electroplating.

[0020] Put the above-mentioned pretreated NdFeB permanent magnet material into the nickel-iron alloy plating solution, the composition of the nickel-iron alloy plating solution is: nickel sulfate 200 g / liter, nickel chloride hexahydrate 10 g / liter, ferrous sulfate 8 gram / liter, neodymium chloride hexahydrate 1 gram / liter, boric acid 30g / L, stabilizer sodium citrate 30 grams / liter, gluconic acid 5 grams / liter, adopt ...

Embodiment 2

[0024] 3 kg of D12*4 sintered NdFeB permanent magnet materials were polished in a vibration mill for 3 hours. Use 10L degreasing agent, which is composed of 30g / liter sodium phosphate, 8g / liter sodium carbonate and 8g / liter sodium hydroxide. After degreasing and degreasing NdFeB permanent magnet materials, pickle them with 5% nitric acid solution The oxide on the surface of the NdFeB permanent magnet material is then washed with water for 3 times. Then use 5% sulfuric acid solution to activate the NdFeB permanent magnet material, and then perform electroplating.

[0025]Put the above-mentioned pretreated NdFeB permanent magnet material into the nickel-iron alloy plating solution, the composition of the nickel-iron alloy plating solution is: nickel sulfate 250 grams / liter, nickel chloride hexahydrate 15 grams / liter, ferrous sulfate 8 gram / liter, neodymium chloride hexahydrate 2 grams / liter, boric acid 50g / L, stabilizer sodium citrate 25 grams / liter, gluconic acid 15 grams / lite...

Embodiment 3

[0029] 3 kg of D12*4 sintered NdFeB permanent magnet materials were polished in a vibration mill for 3 hours. Use 10L degreasing agent, which is composed of 30g / liter sodium phosphate, 8g / liter sodium carbonate and 8g / liter sodium hydroxide. After degreasing and degreasing NdFeB permanent magnet materials, pickle them with 5% nitric acid solution The oxide on the surface of the NdFeB permanent magnet material is then washed with water for 3 times. Then use 5% sulfuric acid solution to activate the NdFeB permanent magnet material, and then perform electroplating.

[0030] The above-mentioned pretreated NdFeB permanent magnet material is put into the nickel-iron alloy plating solution, the composition of the nickel-iron alloy plating solution is: nickel sulfate 270 grams / liter, nickel chloride hexahydrate 20 grams / liter, ferrous sulfate 7 gram / liter, neodymium chloride hexahydrate 0.5 gram / liter, boric acid 45g / L, stabilizer sodium citrate 35 grams / liter, gluconic acid 15 grams...

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Abstract

The invention provides an anticorrosion method of a multifunctional neodymium-iron-boron permanent magnet. The surface treatment method comprises the following steps: (1) chamfering and polishing: conventional polishing is carried out for a neodymium-iron-boron permanent magnet material by using a mechanical vibrational milling method and a barreling chamfering method; (2) degreasing and oil removing: sodium phosphate, sodium carbonate or sodium hydroxide are added for carrying out conventional degreasing and oil removing; (3) pickling and rust removal: a nitric acid solution is added for carrying out conventional pickling and rust removal, and washing; (4) Ni-Fe alloy is electroplated in order to form a Ni-Fe alloy membrane bottom layer; (5) bright nickel is electroplated in order to form a Ni-Fe alloy film formation outer layer. A layer with uniform surface and high corrosion resistance is formed in order to prevent the permanent magnet material from further corrosion due to various harmful gases.

Description

technical field [0001] The invention relates to the field of surface treatment of materials, in particular to the surface treatment technology of NdFeB permanent magnet materials. Specifically, the invention relates to a multilayer nickel anticorrosion method for NdFeB permanent magnets. Background technique [0002] In recent years, the application and development of neodymium iron boron (NdFeB) permanent magnet materials is very rapid, and the success of the protection of NdFeB permanent magnet materials is related to one of the key technologies whether the material can be popularized and applied. The material is mainly made of rare earth metals such as neodymium Nd, iron and boron through powder metallurgy process. As the strongest magnetic material at present, it has been widely used in electroplating devices, machinery, medical treatment, automobiles and other fields, and its application prospects are very broad. [0003] The premise of the application of NdFeB permane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56C25D3/12C25D5/12C25D5/34
Inventor 白晓刚潘广麾李大军
Owner TIANJIN SANHUAN LUCKY NEW MATERIAL CO LTD