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Method for electroplating zinc-nickel alloy through neodymium iron boron magnet ionic liquid

An ionic liquid and zinc-nickel electroplating technology, which is applied in the field of electroplating zinc-nickel alloys in NdFeB magnet ionic liquids and electroplating zinc-nickel alloys for NdFeB magnets, can solve the problems of hydrogen evolution reaction coatings, complex procedures, and high costs. The effect of low operating temperature, avoiding hydrogen evolution reaction, and improving conductivity

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

[0006] On the basis of the prior art, the present invention overcomes the problems of complex procedures, high cost, and easy occurrence of hydrogen evolution reaction during electroplating in aqueous solution to cause the coating to fall off in the process of electroplating zinc-nickel alloy for NdFeB magnets, and provides a NdFeB magnet Method for electroplating zinc-nickel alloy with ionic liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Pre-treatment of NdFeB magnet plating: baking in a muffle furnace at 300°C for 2 hours; sealing with zinc stearate at 140°C for 30min; 30g / L normal temperature degreasing agent solution ultrasonic degreasing for 10min; 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 pyrophosphate Sodium, 8g / L hydrofluoric acid, 8 / L sodium carbonate, zinc dip at 80℃ for 30s.

[0038] (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, add an equal volume of formamide, magnetically stir to make it fully mixed, and filter through a funnel to obtain a colorless and transparent liquid. Add 60g / L of anhydrous Zn...

Embodiment 2

[0043] Based on the method of the first embodiment, the second embodiment adopts a pulsed power supply to electroplating the neodymium iron boron in the ionic liquid of the zinc nickel alloy.

[0044] The thickness of the coating obtained by this method is 19 μm. The coating before light emission is obviously brighter than that of Example 1. After passivation, the coating is rainbow-colored, and the bonding strength meets the first-class standard. There is no rust in the neutral salt spray test for 200 hours.

Embodiment 3

[0046] (1) Pretreatment for NdFeB magnet 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 pyrophosphate Sodium, 10g / L hydrofluoric acid, 10 / L sodium carbonate, zinc dip at 70℃ for 30s.

[0047] (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 it is dissolved, add an equal volume of acetamide, magnetically stir to make it fully mixed, and filter through a funnel to obtain a colorless and transparent liquid. Add 75g / L of anhy...

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Abstract

The invention relates to a method for electroplating zinc-nickel alloy through neodymium iron boron magnet ionic liquid. According to the method, a neodymium iron boron magnet treated before electroplating is used as a cathode, zinc is used as an anode, the ionic liquid containing additives is used as electroplating liquid, under the magnetic stirring condition, the temperature, the current intensity and the electroplating time are controlled for implementing the zinc-nickel alloy electroplating process on the neodymium iron boron magnet, and then, bright dipping, passivation and aging treatment are carried out. The method has the advantages that the plating liquid cost is low, the synthesis is simple, the operation temperature is low, the hydrogen evolution reaction is avoided, the obtained plating layer is bright and compact, the combination of a base body and the plating layer subjected to passivation treatment after plating is firm, and the corrosion resistance performance is good.

Description

technical field [0001] The invention relates to a method for electroplating a zinc-nickel alloy on a neodymium-iron-boron magnet, in particular to a method for electroplating a zinc-nickel alloy in an ionic liquid of an neodymium-iron-boron magnet, belonging 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. W...

Claims

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Application Information

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IPC IPC(8): C25D3/66C25D3/56
Inventor 梁镇海赵煜杨志闫瑞景
Owner TAIYUAN UNIV OF TECH
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