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Method for electroplating zinc-nickel alloy, magnet, electroplating solution and purpose of potassium chloride

A technology for electroplating zinc-nickel and zinc-nickel alloys, applied in jewelry and other directions, can solve problems such as poor deep plating ability, and achieve the effect of high current efficiency and improved deep plating ability

Active Publication Date: 2020-04-10
BAOTOU TIANHE MAGNETICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method uses ammonium chloride as an important component of the electroplating solution, and the sealing treatment is performed, so the deep plating ability is poor

Method used

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  • Method for electroplating zinc-nickel alloy, magnet, electroplating solution and purpose of potassium chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] (1) Manually chamfer the NdFeB magnet, the C angle is 0.3, and then perform vibration chamfering, the R angle is 0.6. Place the chamfered NdFeB magnet in a degreasing agent at 45°C, and perform degreasing treatment under ultrasonic conditions for 45s. The degreasing agent is composed of 13g / L sodium fluoride, 20g / L sodium phosphate, 30g / L cocoate diethanolamine, 20g / L sodium pyrophosphate, 20g / L fatty alcohol polyoxyethylene ether and water. The degreased NdFeB magnet was placed in an aqueous nitric acid solution with a concentration of 10 wt%, and pickled under ultrasonic conditions for 30s. The pickled NdFeB magnet was placed in a citric acid solution with a pH of 3 at 25° C. for 30 seconds for activation treatment to obtain the first magnet.

[0099] (2) The first magnet is placed in an electroplating solution at 35° C. for electroplating to obtain a second magnet. Cathode moving mode is adopted, and the cathode current density is 1.5A / dm -2 . The electroplating ...

Embodiment 2

[0102](1) Manually chamfer the NdFeB magnet, the C angle is 0.5, and then perform vibration chamfering, the R angle is 0.7. Place the chamfered NdFeB magnet in a degreasing agent at 50°C, and perform degreasing treatment under ultrasonic conditions for 30s. The degreasing agent is composed of 15g / L sodium fluoride, 40g / L sodium phosphate, 30g / L cocoate diethanolamine, 25g / L sodium pyrophosphate, 35g / L fatty alcohol polyoxyethylene ether and water. Then, the degreased NdFeB magnet was placed in an aqueous nitric acid solution with a concentration of 10 wt%, and pickled under ultrasonic conditions for 45s. The pickled NdFeB magnet was placed in a citric acid solution with a pH of 3 at 25° C. for 40 seconds for activation treatment to obtain the first magnet.

[0103] (2) The first magnet is placed in an electroplating solution at 35° C. for electroplating to obtain a second magnet. Cathode moving mode is adopted, and the cathode current density is 0.75A / dm -2 . Electroplatin...

Embodiment 3

[0106] (1) Manually chamfer the NdFeB magnet, the C angle is 0.4; then perform vibration chamfering, the R angle is 0.7. Place the chamfered NdFeB magnet in a degreasing agent at 55°C, and perform degreasing treatment under ultrasonic conditions for 30s. The degreasing agent is composed of 10g / L sodium fluoride, 20g / L sodium phosphate, 25g / L cocoate diethanolamine, 20g / L sodium pyrophosphate, 20g / L fatty alcohol polyoxyethylene ether and water. Then, the degreased NdFeB magnet was placed in an aqueous solution of nitric acid with a concentration of 10 wt%, and pickled under ultrasonic conditions for 30 s. The pickled NdFeB magnet was placed in a citric acid solution with a pH value of 2.3 at 25° C. for 40 seconds for activation treatment to obtain the first magnet.

[0107] (2) The first magnet is placed in an electroplating solution at 35° C. for electroplating to obtain a second magnet. Cathode moving mode is adopted, and the cathode current density is 0.75A / dm -2 . The ...

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Abstract

The invention discloses a method for electroplating a zinc-nickel alloy, a magnet, an electroplating solution and a purpose of potassium chloride. The method comprises the following steps of performing pretreatment on a sintered neodymium-iron-boron magnet, to obtain a first magnet; putting the first magnet into the electroplating solution to perform electroplating, to obtain a second magnet, wherein the electroplating solution is prepared from zinc chloride, nickel chloride, potassium chloride, boric acid and water; and performing post treatment on the second magnet, to obtain a sintered neodymium-iron-boron magnet with zinc-nickel alloy plating, wherein the zinc-nickel alloy plating is directly in contact with the surface of the sintered neodymium-iron-boron magnet. By using the method provided in the invention, the hole sealing treatment is not needed to be performed on the magnet; and the current efficiency is high.

Description

technical field [0001] The invention relates to a method for electroplating a zinc-nickel alloy, a magnet, an electroplating solution and applications of potassium chloride. Specifically, the present invention relates to a method for directly electroplating a zinc-nickel alloy on the surface of a sintered NdFeB magnet. Background technique [0002] Sintered NdFeB magnets, as the third-generation rare earth permanent magnet materials, have been widely used and developed in the fields of electronics, home appliances, and automobiles due to their excellent magnetic properties and high cost performance. The structure of sintered NdFeB magnets is loose and the surface is porous, resulting in poor corrosion resistance, so it is necessary to coat the surface of sintered NdFeB magnets with a metal layer. The metal layer includes a zinc-nickel layer, a zinc-copper-nickel layer, a nickel-copper-nickel layer, and the like. Plating a metal layer on the surface of a sintered NdFeB magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/56C25D7/00C25D5/36
CPCC25D3/562C25D3/565C25D5/36C25D7/001
Inventor 张明鑫曾庆业刘延斌董义王宏雪袁易陈雅袁文杰
Owner BAOTOU TIANHE MAGNETICS TECH CO LTD
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