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Method for electroplating zinc in neodymium iron boron magnet ionic liquid

An ionic liquid, NdFeB technology, applied in the field of electro-galvanizing in Nd-Fe-B magnet ionic liquid, Nd-Fe-B magnet electro-galvanizing

Inactive Publication Date: 2015-04-22
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 liquid to solve the following problems in the prior art NdFeB magnet electrogalvanizing process:

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for electroplating zinc in a neodymium iron boron magnet ionic liquid of the present invention is carried out according to the following process steps:

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

[0043] (2) Ionic liquid synthesis: molar ratio 79%: 19.5%: 1.5%. Weigh a certain amount of urea, sodium iodide, and potassium iodide, mix them in a dry beaker and seal them, and place them in a vacuum drying oven at 80°C. Heat for 5 hours, wait until all of it is dissolved, ...

Embodiment 2

[0048] Based on the method for electroplating zinc with neodymium-iron-boron ionic liquid in the above-mentioned embodiment 1, the method of the embodiment 2 adopts a pulsed electroplating power supply to implement electroplating with zinc.

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

Embodiment 3

[0051] A method for electroplating zinc in a neodymium iron boron magnet ionic liquid of the present invention is implemented, and the specific process steps of the method are as follows:

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

[0053] (2) Ionic liquid synthesis: 80% by molar ratio: 18%: 2%. Weigh a certain amount of urea, sodium bromide, and potassium bromide, mix them in a dry beaker and airtight them, and place them in a vacuum at 80°C. Heat in the box for 4 hours, wait until all of...

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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 provides a method for electroplating zinc on a neodymium iron boron magnet, in particular to a method for electroplating zinc in an ionic liquid of a neodymium iron boron magnet, and belongs to the technical field of surface anticorrosion and electrochemistry of metal materials. Background technique [0002] NdFeB is known as the "king of magnetism" because of its excellent magnetic properties. Since its inception in the 1980s, it has received extensive attention and has been used in communications, computers, military, medical and other fields. However, due to the existence of active neodymium in the neodymium iron boron 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 NdFeB protection mainly adopts electro-galvanized, electro-nickel or electroless nickel-plated. The traditional NdFeB zinc ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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