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Electrophoresis method of neodymium-iron-boron magnet

A technology of NdFeB magnets, applied in electrophoretic plating, electrolytic coating, metal material coating technology, etc., can solve the problems of low anti-corrosion performance, large porosity of phosphating film layer, corrosion of NdFeB magnets, etc. , to achieve the effect of improved corrosion resistance, small grain size and small porosity

Active Publication Date: 2018-05-18
NINGBO YUNSHENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The phosphating solution used in the current phosphating process is usually composed of zinc dihydrogen phosphate, zinc oxide, sodium molybdate, sodium nitrate, sodium nitrite, phosphoric acid and water. The phosphating solution formed on the surface of the NdFeB magnet The grain size of the film layer is large, which leads to a large porosity of the phosphating film layer, and the corrosive substances contained in the air can easily infiltrate from the gap of the phosphating film layer through the electrophoretic film layer, thereby corroding the NdFeB magnet. The anti-corrosion performance of this existing NdFeB magnet electrophoresis method is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: An electrophoresis method for an NdFeB magnet, comprising the following steps: ① pretreatment process, ② phosphating process, ③ electrophoresis process and ④ curing process, and the phosphating process specifically includes the following steps:

[0028]②-1Put the pre-treated NdFeB magnet into a phosphating tank filled with phosphating solution for phosphating treatment. The phosphating treatment time is 600 seconds. The phosphating solution is composed of zinc dihydrogen phosphate, zinc oxide, molybdenum sodium nitrate, sodium nitrite, phosphoric acid, diammonium hydrogen citrate, nickel ammonium sulfate, copper sulfate and water, the mass volume concentration of zinc dihydrogen phosphate is 100 g / L, and the mass volume concentration of zinc oxide is 60 g / L, the mass volume concentration of sodium molybdate is 5 g / L, the mass volume concentration of sodium nitrate is 10 g / L, the mass volume concentration of sodium nitrite is 5 g / L, and the mass volume conce...

Embodiment 2

[0033] Embodiment 2: An electrophoresis method for an NdFeB magnet, comprising the following steps: ① pretreatment process, ② phosphating process, ③ electrophoresis process and ④ curing process, and the phosphating process specifically includes the following steps:

[0034] ②-1Put the pre-treated NdFeB magnet into a phosphating tank filled with phosphating solution for phosphating treatment. The phosphating treatment time is 900 seconds. The phosphating solution is composed of zinc dihydrogen phosphate, zinc oxide, molybdenum Sodium acid, sodium nitrate, sodium nitrite, phosphoric acid, diammonium hydrogen citrate, nickel ammonium sulfate, copper sulfate and water, the mass volume concentration of zinc dihydrogen phosphate is 150 g / L, and the mass volume concentration of zinc oxide is 100 g / L, the mass volume concentration of sodium molybdate is 15 g / L, the mass volume concentration of sodium nitrate is 25 g / L, the mass volume concentration of sodium nitrite is 20 g / L, and the ...

Embodiment 3

[0039] Embodiment 3: An electrophoresis method for an NdFeB magnet, comprising the following steps: ① pretreatment process, ② phosphating process, ③ electrophoresis process and ④ curing process, and the phosphating process specifically includes the following steps:

[0040] ②-1Put the pre-treated NdFeB magnet into a phosphating tank filled with phosphating solution for phosphating treatment. The phosphating treatment time is 600 seconds. The phosphating solution is composed of zinc dihydrogen phosphate, zinc oxide, molybdenum sodium nitrate, sodium nitrite, phosphoric acid, diammonium hydrogen citrate, nickel ammonium sulfate, copper sulfate and water, the mass volume concentration of zinc dihydrogen phosphate is 100 g / L, and the mass volume concentration of zinc oxide is 60 g / L, the mass volume concentration of sodium molybdate is 5 g / L, the mass volume concentration of sodium nitrate is 10 g / L, the mass volume concentration of sodium nitrite is 5 g / L, and the mass volume conc...

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PUM

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Abstract

The invention discloses an electrophoresis method of a neodymium-iron-boron magnet. The electrophoresis method comprises the steps of pretreatment procedure, phosphating procedure, sealing procedure,electrophoresis procedure and curing procedure, wherein a phosphating solution adopted in the phosphating procedure comprises zinc dihydrogen phosphate, zinc oxide, sodium molybdate, sodium nitrate, sodium nitrite, phosphoric acid, diammonium hydrogen citrate, ammonium nickel sulfate, copper sulfate and water; and a sealing solution adopted in the sealing procedure comprises phosphoric acid, zincoxide, ammonium citrate, ammonium fluoride and water. The electrophoresis method has the advantage that the corrosion resistant performance of the neodymium-iron-boron magnet is relatively high.

Description

technical field [0001] The invention relates to an electrophoresis method, in particular to an electrophoresis method for an NdFeB magnet. Background technique [0002] The material of NdFeB magnets is easy to be corroded. At present, in order to protect NdFeB magnets and improve their anti-corrosion performance, surface treatment methods are usually used to form a protective layer on the surface for protection. As a surface treatment method to improve the protective performance, electrophoresis not only smoothes the coating film, but also has better water resistance and chemical resistance, and reduces pollution, which can save energy and resources. It has been widely used in anti-corrosion treatment. [0003] The existing electrophoresis method for NdFeB magnets mainly includes pretreatment, phosphating, electrophoresis and curing processes. The phosphating solution used in the current phosphating process is usually composed of zinc dihydrogen phosphate, zinc oxide, sodiu...

Claims

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Application Information

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IPC IPC(8): C23C22/42C23C22/83C25D13/20C25D13/06
CPCC23C22/42C23C22/83C25D13/04C25D13/20
Inventor 陈久扬杨江华江康健王其跃郑亮
Owner NINGBO YUNSHENG
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