Electronickelling method for neodymium iron boron sheet magnetic steel product

A neodymium iron boron and nickel electroplating technology, applied in the field of nickel electroplating, can solve the problems affecting the overall assembly of the product, poor coating distribution uniformity, excessive size and thickness difference, etc., and achieves high uniformity, low porosity, and uniform dispersion. improved effect

Inactive Publication Date: 2016-01-06
NINGBO YUNSHENG MAGNET DEVICES TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing electroplating nickel method is applied to the treatment of neodymium with the characteristics of thin thickness (thickness ≤ 1mm), small chamfering angle (chamfering radius R ≤ 0.2) and narrow dimensional tolerance band (positive and negative tolerance ≤ 0.010mm). When using iron-boron thin-film magnet products, the power lines will be too concentrated on the e

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  • Electronickelling method for neodymium iron boron sheet magnetic steel product

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment one: a kind of electroplating nickel method of NdFeB sheet magnetic steel product, comprises the following steps:

[0027] ① Pre-treatment of NdFeB thin sheet magnet products;

[0028] ② Pre-nickel-plating treatment of NdFeB thin-sheet magnetic steel products: the pre-nickel plating solution is composed of nickel sulfate, boric acid, sodium isethionate, hydroxypropyl sodium thiosulfate and water, and the mass volume concentration of nickel sulfate is 220 grams per liter, the mass volume concentration of boric acid is 30 grams per liter, the mass volume concentration of sodium isethionate is 10 mg / liter, and the mass volume concentration of hydroxypropyl sodium thiosulfate is 2 mg / liter. Nickel plating treatment time is 3500 seconds, double pulse power supply is used in the process of pre-nickel plating, the forward current density is 0.2 ampere / dm2, the reverse current density is 0.1 ampere / dm2, and the forward conduction time is 10 seconds, the reverse cond...

Embodiment 2

[0043] Embodiment two: a kind of electroplating nickel method of NdFeB sheet magnetic steel product, comprises the following steps:

[0044] ① Pretreatment of NdFeB thin sheet magnet products;

[0045] ② Pre-nickel-plating treatment of NdFeB thin-sheet magnetic steel products: the pre-nickel plating solution is composed of nickel sulfate, boric acid, sodium isethionate, hydroxypropyl sodium thiosulfate and water, and the mass volume concentration of nickel sulfate is 300 grams / liter, the mass volume concentration of boric acid is 50 grams / liter, the mass volume concentration of sodium isethionate is 25 mg / liter, and the mass volume concentration of hydroxypropyl sodium thiosulfate is 8 mg / liter. The nickel plating treatment time is 6500 seconds, and the double pulse power supply is used in the pre-nickel plating process. The forward current density is 0.8 ampere / square decimeter, the reverse current density is 0.3 ampere / square decimeter, and the forward conduction time is 20 ...

Embodiment 3

[0061] Embodiment three: a kind of electroplating nickel method of neodymium-iron-boron sheet magnetic steel product, comprises the following steps:

[0062] ① Pretreatment of NdFeB thin sheet magnet products;

[0063] ② Pre-nickel-plating treatment of NdFeB thin-sheet magnetic steel products: the pre-nickel plating solution is composed of nickel sulfate, boric acid, sodium isethionate, hydroxypropyl sodium thiosulfate and water, and the mass volume concentration of nickel sulfate is 250 grams per liter, the mass volume concentration of boric acid is 40 grams per liter, the mass volume concentration of sodium isethionate is 20 mg / liter, and the mass volume concentration of hydroxypropyl sodium thiosulfate is 5 mg / liter. Nickel plating treatment time is 5000 seconds, double pulse power supply is used in the process of pre-nickel plating treatment, its forward current density is 0.6 ampere / square decimeter, reverse current density is 0.2 ampere / square decimeter, forward conducti...

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Abstract

The invention discloses an electronickelling method for a neodymium iron boron sheet magnetic steel product. Nickel preplating, semi-bright nickel plating and bright nickel plating are sequentially conducted, a double-pulse power supply is adopted in the nickel preplating process, high current density is used by the double-pulse power supply, and therefore a nickel preplated coating large in density, high in hardness, low in porosity and high in uniformity is formed on the surface of the neodymium iron boron sheet magnetic steel product where nickel preplating is conducted. In the subsequent semi-bright nickel plating process, a semi-bright nickel solution is composed of nickel sulfate, nickel chloride, boric acid, sodium potassium tartrate tetrahydrate, triethanolamine, ammonium sulfate, ammonium hydroxide and water according to a specific ratio, sodium potassium tartrate tetrahydrate serves as a coordination agent in the semi-bright nickel solution, ammonium sulfate serves as conducting salt, uniformity of a semi-bright nickel coating is improved, and finally a bright nickel layer high in uniformity is generated on the semi-bright nickel coating. The electronickelling method has the beneficial effects that a nickel-plated layer is composed of the nickel preplated layer, the semi-bright nickel layer and the bright nickel layer which are high in uniformity, and the coating distribution uniformity of the neodymium iron boron sheet magnetic steel product is greatly improved.

Description

technical field [0001] The invention relates to a nickel electroplating method, in particular to a nickel electroplating method for neodymium-iron-boron thin-slice magnetic steel products. Background technique [0002] NdFeB permanent magnet material is a powder material with strong chemical activity. Its characteristics are hard and brittle, and it is easy to be oxidized and corroded. The corrosion resistance of NdFeB magnet products made of NdFeB permanent magnet materials poor. At present, the most effective anti-corrosion method adopted by NdFeB magnet products is to use surface treatment methods to form a protective layer on the surface of NdFeB magnet products. Since the surface of NdFeB magnet products has a deteriorated layer produced during grinding, voids and oxidation caused by incomplete densification, the surface treatment process usually includes necessary pre-treatment and appropriate electroplating process. Electroplated nickel crystals are extremely small ...

Claims

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Application Information

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IPC IPC(8): C25D5/14C25D5/18C25D3/12C25D5/36
Inventor 陈久扬许式袍杨江华黄昌菊孙王杰
Owner NINGBO YUNSHENG MAGNET DEVICES TECH
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