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Method for electroplating zinc-nickel alloy on sintered neodymium-iron-boron material

A technology of electroplating zinc-nickel and neodymium-iron-boron, which is applied in liquid chemical plating, metal material coating process, coating, etc., can solve the problems of affecting corrosion resistance and poor bonding force of neodymium-iron-boron electroplating zinc-nickel alloy, etc. Achieve excellent corrosion resistance

Inactive Publication Date: 2010-06-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of poor bonding force and influence on corrosion resistance of NdFeB electroplating zinc-nickel alloy, the purpose of the present invention is to provide a method for sintering NdFeB electroplating zinc-nickel alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1 Material preparation: Grind NdFeB to 600#, degrease with ultrasonic acetone for 3 minutes.

[0038] 2 Pickling: nitric acid 60ml / L, thiourea 0.5g / L, temperature 25°C, time 30 seconds, then wash with water for 1 minute.

[0039] 3. Activation: sulfosalicylic acid 20g / L, ammonium hydrogen fluoride 10g / L, temperature 25°C, time 30 seconds. Then, ultrasonic cleaning was performed for 1 minute.

[0040] 4 Electroless nickel plating: NiSO 4 ·6H 2 O: 0.1mol / L, NaH 2 PO 2 ·H 2 O: 30g / L, borax: 30g / L, sodium citrate: 30g / L, ammonium fluoride: 3g / L, succinic acid: 5g / L, pH=7.5, temperature 80°C, electroless plating for 15 minutes. Wash with water for 1 minute and blow dry. The thickness of the electroless nickel plating is 5 microns.

[0041] 5 Copper plating: copper sulfate 60g / L, potassium pyrophosphate 300g / L, ammonium citrate 25g / L, pH=9, temperature 40°C, cathode current: 1.0A / dm 2 , electroplating for 20 minutes, rinse with water for 2 minutes. The thickness of ...

Embodiment 2

[0045] 1 Material preparation: Grind NdFeB to 600#, degrease with ultrasonic acetone for 3 minutes.

[0046] 2 Pickling: nitric acid 60ml / L, thiourea 0.5g / L, temperature 25°C, time 30 seconds, then wash with water for 1 minute.

[0047] 3. Activation: sulfosalicylic acid 20g / L, ammonium hydrogen fluoride 10g / L, temperature 25°C; time 30 seconds. Then, ultrasonic cleaning was performed for 1 minute.

[0048] 4 Electroless nickel plating: NiSO 4 ·6H 2 O: 0.1mol / L, NaH 2 PO 2 ·H 2 O: 30g / L, borax: 30g / L; sodium citrate: 30g / L, ammonium fluoride: 3g / L, succinic acid: 5g / L, pH=7.5, temperature 80°C, electroless plating for 15 minutes. Wash with water for 1 minute and blow dry. The thickness of the electroless nickel plating is 5 microns.

[0049] 5 Copper plating: copper sulfate 60g / L, potassium pyrophosphate 300g / L, ammonium citrate 25g / L, pH=9, temperature: 40°C, cathode current: 1.0A / dm 2 , electroplating for 20 minutes, rinse with water for 2 minutes. The thickness of...

Embodiment 3

[0053] 1 Material preparation: Grind NdFeB to 400#, degrease with ultrasonic acetone for 3 minutes.

[0054] 2 Pickling: nitric acid 60ml / L, thiourea 0.5g / L, temperature 25°C, time 30 seconds, then wash with water for 1 minute.

[0055]3. Activation: sulfosalicylic acid 20g / L, ammonium hydrogen fluoride 10g / L, temperature 25°C, time 30 seconds. Then, ultrasonic cleaning was performed for 1 minute.

[0056] 4 Electroless nickel plating: NiSO 4 ·6H 2 O: 0.1mol / L, NaH 2 PO 2 ·H 2 O: 30g / L, borax: 30g / L, sodium citrate: 30g / L, ammonium fluoride: 3g / L, succinic acid: 5g / L, pH=7.5, temperature 80°C, electroless plating for 15 minutes. Wash with water for 1 minute and blow dry. The thickness of the electroless nickel plating is 5 microns.

[0057] 5 Copper plating: copper sulfate 60g / L, potassium pyrophosphate 300g / L, ammonium citrate 25g / L, pH=9, temperature: 40°C, cathode current: 1.0A / dm 2 , electroplating for 20 minutes, rinse with water for 2 minutes. The thickness of ...

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Abstract

The invention relates to the field of surface treatment corrosion protection for a sintered neodymium-iron-boron material, in particular to a method for electroplating a zinc-nickel alloy on the surface of the sintered neodymium-iron-boron material. The method is mainly characterized by comprising the following steps of: firstly, performing treatment before plating on the sintered neodymium-iron-boron material; secondly, carrying out chemical nickel plating; thirdly, carrying out copper electroplating and zinc-nickel alloy electroplating; and finally, carrying out passivation treatment. The binding force between an adopted chemical nickel-plated layer and the neodymium-iron-boron material is excellent; a copper-plated layer can play a role in hydrogen blocking while electroplating the zinc-nickel alloy so as to reduce the hydrogen corrosion to the neodymium-iron-boron material; and a zinc-nickel alloy layer, as an anode coating, effectively protects the neodymium-iron-boron material. The coating obtained by the method is complete, compact, uniform and bright, and is firmly combined with a substrate; and the corrosion resistance of the coating is further improved after the passivation treatment. The method solves the problem that the neodymium-iron-boron electroplated zinc-nickel alloy has poor binding force and affects the corrosion resistance. The method realizes good binding force between the coating and the substrate, dense coating, uniform component and excellent corrosion resistance.

Description

Technical field: [0001] The invention relates to the field of surface treatment and anticorrosion of sintered NdFeB materials, in particular to a method for electroplating zinc-nickel alloys of sintered NdFeB materials. Background technique: [0002] As the third generation permanent magnet material, sintered NdFeB permanent magnet material has high magnetic properties, abundant resources and low price, and is widely used in automobiles, computers, nuclear magnetic resonance and other fields. However, since sintered NdFeB is composed of multiple phases, the potential difference of each phase is relatively large, especially the Nd-rich phase has a low potential, which is prone to intergranular corrosion, resulting in poor corrosion resistance of NdFeB itself, which seriously restricts Application of NdFeB. In order to solve this problem, a series of surface treatment technologies for NdFeB protection have been invented, mainly including electro-galvanizing, electro-nickel pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C23C18/32C25D3/38C25D3/56
Inventor 孙臣张伟严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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