Method for carrying out electronickelling on neodymium-iron-boron magnet

A technology of NdFeB and nickel electroplating, which is applied in the field of NdFeB magnet electroplating nickel, can solve the problems of NdFeB magnets, such as a large drop in magnetic properties, poor uniformity of coating thickness, and adverse effects on magnetic properties, to achieve improved uniform distribution. Sex, good magnetic performance, and the effect of eliminating the decline of magnetic performance

Active Publication Date: 2014-10-29
NINGBO YUNSHENG +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the electroplating nickel process of existing NdFeB magnet has the following problems: one, on the one hand, the electrode in the pre-nickeling process has a bad influence on the magnetic properties of the NdFeB magnet, and on the other hand, due to the electroplating solution used in the pre-nickeling process Chloride ions exist, and NdFeB magnets are in direct contact with chloride ions in the pre-nickeling process, and the NdFeB magnet substrate is corroded by chloride ions, which leads to a large decline in the magnetic properties of the NdFeB magnets after electroplating. Second, for products with small end angles (that is, products with tip parts), due to the tip discharge effect, more electrons will gather at the tip of the NdFeB magnet during the electroplating process, causing a large amount of nickel ion discharge deposition , resulting in poor uniformity of coating thickness distribution

Method used

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  • Method for carrying out electronickelling on neodymium-iron-boron magnet
  • Method for carrying out electronickelling on neodymium-iron-boron magnet
  • Method for carrying out electronickelling on neodymium-iron-boron magnet

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Embodiment 1

[0021] Embodiment one: a kind of NdFeB magnet electroplating nickel method, comprises the following steps:

[0022] ① Pretreatment of NdFeB magnets;

[0023] ②Nickel pre-plating: put the pre-treated NdFeB magnet into the first nickel electroplating solution for pre-nickel plating for 3500 seconds, in which the first nickel electroplating solution is composed of nickel sulfate, boric acid, and sodium succinate , sodium carboxyethylsulfonate and water, the mass volume concentration of nickel sulfate is 250 g / L, the mass volume concentration of boric acid is 40 g / L, the mass volume concentration of succinate sodium salt is 5 mg / L, carboxylate The mass volume concentration of sodium ethyl sulfonate is 5 milligrams per liter, and the current density is 0.2 ampere / square decimeter in the pre-nickeling treatment process, and the temperature of the first electroplating nickel solution is 45 degrees Celsius, and the pH value is 4.1;

[0024] ③ Use deionized water to clean the pre-nick...

Embodiment 2

[0036] Embodiment two: a kind of NdFeB magnet electroplating nickel method, comprises the following steps:

[0037] ① Pretreatment of NdFeB magnets;

[0038] ②Nickel pre-plating: put the pre-treated NdFeB magnet into the first nickel electroplating solution for pre-nickel plating for 3500 seconds, in which the first nickel electroplating solution is composed of nickel sulfate, boric acid, and sodium succinate , sodium carboxyethylsulfonate and water, the mass volume concentration of nickel sulfate is 250 g / L, the mass volume concentration of boric acid is 40 g / L, the mass volume concentration of succinate sodium salt is 5 mg / L, carboxylate The mass volume concentration of sodium ethyl sulfonate is 5 milligrams per liter, and the current density is 0.2 ampere / square decimeter in the pre-nickeling treatment process, and the temperature of the first electroplating nickel solution is 45 degrees Celsius, and the pH value is 4.1;

[0039] ③ Use deionized water to clean the pre-nick...

Embodiment 3

[0058] Embodiment three: this embodiment is basically the same as embodiment two, and the difference is only that in this embodiment, the pretreatment process includes the following steps:

[0059] ①-1 Pickling: use dilute nitric acid solution as the pickling solution to pickle the NdFeB magnet;

[0060] ①-2 Washing: Use deionized water to clean the pickled NdFeB magnet several times. During the cleaning process, ultrasonic cleaning is provided. The ultrasonic power is 2000W and the frequency is 60KHz;

[0061] ①-3 Put the washed NdFeB magnet into the electrolytic tank for electrolytic treatment. The electrolytic treatment time is 450 seconds. The electrolyte is composed of sodium hydroxide, sodium carbonate and water, and the mass volume concentration of sodium hydroxide is 60 grams. / liter, the mass volume concentration of sodium carbonate is 40 grams per liter, and the current density is 0.7 amperes / square decimeter in the electrolytic treatment process, and the electrolyt...

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Abstract

The invention discloses a method for carrying out electronickelling on a neodymium-iron-boron magnet. The method particularly comprises the following steps of: carrying out a pretreatment process, a nickel preplating process, a water washing process, a semi-bright nickel plating process, the washing process, a bright nickel plating process and a water washing process on the neodymium-iron-boron magnet, wherein a first electronickelling solution which comprises nickel sulfate, boric acid, sodium succinate, sodium carboxyethyl sulfonate and water is adopted for the nickel preplating process; a second electronickelling solution which comprises nickel sulfate, diammonium hydrogen citrate, the boric acid, ammonia water and water is adopted for the semi-bright nickel plating process; the first electronickelling solution is free of chloride ions, and the first electronickelling solution contains the sodium succinate and the sodium carboxyethyl sulfonate; the second electronickelling solution contains a proper amount of diammonium hydrogen citrate. The method disclosed by the invention can ensure that the neodymium-iron-boron magnet has better magnetic property by reducing the influence of an electroplating process on the magnetic property of the neodymium-iron-boron magnet and achieves uniform distribution of coating thickness when a product with a smaller end part angle is electroplated.

Description

technical field [0001] The invention relates to an electroplating method, in particular to a nickel electroplating method for an NdFeB magnet. Background technique [0002] The electroplating process can effectively protect and decorate the magnet, and has been widely used in the surface protection treatment of NdFeB magnets. There are many types of electroplating processes, such as nickel electroplating, copper electroplating and tin electroplating. Among them, the electroplating nickel layer formed on the surface of the NdFeB magnet by the electroplating nickel process has fine crystals and high stability in the air. It is currently a widely used electroplating process. The existing nickel electroplating process for NdFeB magnets mainly includes pre-nickel plating, semi-bright nickel and bright nickel. The electroplating solution composed of nickel sulfate, nickel chloride, boric acid and semi-brightener is used in the process, and the electroplating solution composed of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/14C25D5/36C25D3/12
Inventor 陈久扬杨庆忠许式袍翁浩洲
Owner NINGBO YUNSHENG
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