Nickel electroplating method for NdFeB magnets

A neodymium-iron-boron and nickel electroplating technology is applied in the field of nickel-plating of neodymium-iron-boron magnets, which can solve the problems such as the magnetic properties of neodymium-iron-boron magnets are greatly reduced, the uniform distribution of coating thickness is poor, and the magnetic properties are adversely affected, so as to improve the uniform distribution good magnetic properties, and the effect of eliminating the decline of magnetic properties
CN104120469BActive Publication Date: 2016-05-25NINGBO YUNSHENG +4
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NINGBO YUNSHENG
Publication Date
2016-05-25

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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.
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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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