Method for electroplating zinc in neodymium iron boron magnet ionic liquid

An ionic liquid, NdFeB technology, applied in the field of electrogalvanizing in NdFeB magnet ionic liquid, NdFeB magnet electrogalvanizing field

Inactive Publication Date: 2012-12-19
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for electrogalvanizing an NdFeB magnet in an ionic liq

Method used

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  • Method for electroplating zinc in neodymium iron boron magnet ionic liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Implement the method for electroplating zinc in a kind of neodymium-iron-boron magnet ionic liquid of the present invention, this method is to carry out according to the following processing steps:

[0042] (1) Pre-treatment of NdFeB plating: Baking and degreasing at 300°C in muffle furnace for 2 hours; sealing with zinc stearate at 140°C for 30 minutes; ultrasonic degreasing in 30g / L room temperature degreaser solution for 10 minutes; 30g / L Nitric acid, 1.0g / L thiourea, acid cleaning at room temperature for 60s; 25g / L alkyl salicylic acid, 10g / L ammonium bifluoride, activation at room temperature for 30s; ultrasonic washing; 35g / L zinc sulfate, 120g / L sodium pyrophosphate , 8g / L hydrofluoric acid, 8 / L sodium carbonate, zinc dipping at 80°C for 30s.

[0043] (2) Synthesis of ionic liquid: Weigh a certain amount of urea, sodium iodide, and potassium iodide in a molar ratio of 79%: 19.5%: 1.5%, respectively, mix them in a dry beaker and seal them, and place them in a vacu...

Embodiment 2

[0048] On the basis of the electrogalvanizing method of a neodymium iron boron ionic liquid based on the above-mentioned embodiment 1, the method of example 2 adopts the pulse electroplating power supply to implement electrogalvanizing.

[0049] The thickness of the galvanized layer obtained by this method is 18 μm. The coating is obviously brighter than Example 1 before the light is emitted, almost mirror bright. After passivation, the coating is iridescent, and the bonding strength meets the first-class standard. The neutral salt spray test does not appear after 48 hours. rust.

Embodiment 3

[0051] Implement the method for electrogalvanizing in a kind of neodymium-iron-boron magnet ionic liquid of the present invention, the concrete process step of this method is as follows:

[0052] (1) Pre-treatment of NdFeB plating: Baking and degreasing at 250°C in muffle furnace for 2.5 hours; sealing with zinc stearate at 130°C for 25 minutes; ultrasonic degreasing in 25g / L room temperature degreaser solution for 10min; 25g / L Nitric acid, 0.8g / L thiourea, acid cleaning at room temperature for 40s; 20g / L alkyl salicylic acid, 10g / L ammonium bifluoride, activation at room temperature for 30s; ultrasonic washing; 30g / L zinc sulfate, 100g / L sodium pyrophosphate , 10g / L hydrofluoric acid, 10 / L sodium carbonate, zinc dipping at 70°C for 30s.

[0053] (2) Synthesis of ionic liquids: Weigh a certain amount of urea, sodium bromide, and potassium bromide in a molar ratio of 80%: 18%: 2%, respectively, and disperse them in a dry beaker, seal them, and place them in a vacuum oven at 80°...

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Abstract

The invention relates to a method for electroplating zinc in neodymium iron boron magnet ionic liquid. According to the method, a neodymium iron boron magnet treated before plating is used as a cathode, a zinc sheet is used as an anode, the ionic liquid is adopted as electroplating liquid, under the magnetic stirring condition, a power supply is conducted, the temperature, the current intensity and the electroplating time are controlled for electroplating, and then, bright dipping, passivation and aging treatment are carried out. The method is applied to the neodymium iron boron magnet electroplating, the process is simple, the price of medicine is low, the operation temperature is low, more importantly, the hydrogen evolution reaction is avoided, the obtained plating layer is bright and compact, the combination of the plating layer and a base body is firm, and the corrosion resistance performance is good.

Description

technical field [0001] The invention relates to a method for electrogalvanizing an NdFeB magnet, in particular to a method for electrogalvanizing an NdFeB magnet in an ionic liquid, and belongs to the technical field of metal material surface anticorrosion and electrochemistry. Background technique [0002] NdFeB is known as the "king of magnetism" because of its excellent magnetic properties. It has been widely concerned by people since it came out in the 1980s, and is used in communications, computers, military, medical and other fields. However, due to the presence of active neodymium in the NdFeB magnet, its corrosion resistance is poor, which greatly limits the application of the magnet. Therefore, improving the surface protection technology of NdFeB has become a key issue. [0003] The existing protection of NdFeB mainly adopts electro-galvanizing, electro-nickel plating or electroless nickel plating. The traditional NdFeB electrogalvanizing process is mainly carried...

Claims

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Application Information

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IPC IPC(8): C25D3/22
Inventor 梁镇海闫瑞景杨志郝晓刚樊彩梅
Owner TAIYUAN UNIV OF TECH
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