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NdFeB magnetic steel surface plating method

A technology of NdFeB and magnetic steel, which is applied in the field of electroplating on the surface of NdFeB magnetic steel, which can solve the problems of large loss of magnetic properties and poor anti-corrosion ability, and achieve the effects of strong anti-corrosion ability, improved quality, and reduced porosity

Inactive Publication Date: 2017-07-21
陈治
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of poor anti-corrosion ability and large loss of magnetic properties under the nickel-copper-nickel electroplating process conditions of the existing NdFeB magnets, the present invention provides a NdFeB magnet with high bonding strength, strong anti-corrosion ability and small magnetic loss. steel surface coating method

Method used

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  • NdFeB magnetic steel surface plating method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Pre-treatment: After degreasing 1.5KG of rough black chips, put them into the grinding drum together with 8KG of corundum abrasives, add appropriate amount of water, chamfer and grind for 2 hours. Pickling with nitric acid for 1 to 2 minutes, after ultrasonic cleaning, put it into hydrofluoric acid with a concentration of about 1% to activate for 30 seconds, rinse it clean, and put it into an electroplating barrel plating machine;

[0033] (2) Pre-galvanizing: Put the barrel plating machine into the galvanizing tank, electroplate for 80 minutes at a current of 10 amperes, and transfer it to the zinc-nickel alloy tank after cleaning.

[0034] The composition of the pre-galvanized electroplating solution is: 180 g / L zinc sulfate, 20 g / L boric acid, 50 g / L sodium sulfate, 4 ml BK-38 brightener, pH 5, operating temperature 15°C.

[0035] (3) Zinc-nickel alloy plating: electroplating in a zinc-nickel alloy tank, first electroplating at a current of 15A for 10 minutes, th...

Embodiment 2

[0049] (1) Pre-treatment: After degreasing 1.5KG of rough black chips, put them into the grinding drum together with 8KG of corundum abrasives, add appropriate amount of water, chamfer and grind for 2 hours. Pickling with nitric acid for 1 to 2 minutes, after ultrasonic cleaning, put it into hydrofluoric acid with a concentration of about 1% to activate for 30 seconds, rinse it clean, and put it into an electroplating barrel plating machine;

[0050] (2) Pre-galvanizing: Put the barrel plating machine into the galvanizing tank, electroplate for 80 minutes at a current of 10 amperes, and transfer it to the zinc-nickel alloy tank after cleaning.

[0051]The composition of the pre-galvanized electroplating solution is as follows: 250 g / L zinc sulfate, 28 g / L boric acid, 110 g / L sodium sulfate, 8 ml BK-38 brightener, pH 4.5, operating temperature 25°C.

[0052] (3) Zinc-nickel alloy plating: electroplating in a zinc-nickel alloy tank, first electroplating at a current of 15A for 1...

Embodiment 3

[0067] (1) Pre-treatment: After degreasing 1.5KG of rough black chips, put them into the grinding drum together with 8KG of corundum abrasives, add appropriate amount of water, chamfer and grind for 2 hours. Pickling with nitric acid for 1 to 2 minutes, after ultrasonic cleaning, put it into hydrofluoric acid with a concentration of about 1% to activate for 30 seconds, rinse it clean, and put it into an electroplating barrel plating machine;

[0068] (2) Pre-galvanizing: Put the barrel plating machine into the galvanizing tank, electroplate for 80 minutes at a current of 10 amperes, and transfer it to the zinc-nickel alloy tank after cleaning.

[0069] The composition of the pre-galvanizing electroplating solution is: 300 g / L zinc sulfate, 35 g / L boric acid, 160 g / L sodium sulfate, 10 ml BK-38 brightener, pH 4, operating temperature 40°C.

[0070] (3) Zinc-nickel alloy plating: electroplating in a zinc-nickel alloy tank, first electroplating at a current of 15A for 10 minutes,...

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Abstract

The invention discloses an NdFeB magnetic steel surface plating method. The method includes the steps that plating is conducted on an NdFeB magnetic steel surface, and a pre-galvanizing layer, a strong complexing copper or zinc alloy plating layer, a neutral nickel plating layer, a non-cyanide copper plating layer and a nickel plating layer are sequentially arranged from inside to outside; the galvanizing layer serves as a bottom layer, and then the strong complexing copper or zinc alloy plating layer is added, so that an NdFeB magnetic steel plating layer is high in bonding strength, high in preservative activity and small in magnetic loss. Through improvement, the binding force is increased by 10%-20% on average compared with a conventional process, and the average magnetic loss rate is lowered to 1%-5% from 5%-10% in the conventional process; and the quality of a magnetic steel surface electroplated layer is greatly improved, and the product percent of pass is increased.

Description

technical field [0001] The invention belongs to the technical field of surface electroplating of neodymium-iron-boron magnets, in particular to a surface coating method of neodymium-iron-boron magnets. Background technique [0002] In recent years, the development and application of rare earth neodymium-iron-boron (NdFeB) magnets has been very rapid. NdFeB is known as the "king of magnets" because of its excellent magnetic properties, and is widely used in communications, computers, military, medical, etc. field. However, due to the presence of active neodymium in the NdFeB magnet, its corrosion resistance is poor. When the NdFeB magnet is corroded, its magnetic properties will decline, which will lead to a decrease in the reliability and stability of the product. Large limit the application of the magnetic steel. Higher requirements are put forward for the anti-corrosion work of NdFeB. [0003] Because electroplating has the advantages of strong protection ability, stabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/14C25D3/22C25D3/56C25D3/12C25D3/38
CPCC25D3/12C25D3/22C25D3/38C25D3/56C25D5/14
Inventor 陈治
Owner 陈治
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