Vacuum aluminizing/cathode electrophoresis composite protective technique for NdFeB magnet and NdFeB magnet with composite protective layer

A technology of cathodic electrophoresis and vacuum aluminum plating, used in vacuum evaporation plating, electrophoresis plating, magnetic objects, etc. Focus on improving and meeting the effect of market requirements

Inactive Publication Date: 2011-06-29
YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The advantages of the vacuum aluminum plating method are no pollution, no corner effect on the coating, and rich aluminum resources. The disadvantage is that the adhesion and corrosion resistance are poor. At the same time, because aluminum is an amphoteric metal, it has poor acid and alkali resistance.

Method used

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  • Vacuum aluminizing/cathode electrophoresis composite protective technique for NdFeB magnet and NdFeB magnet with composite protective layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Degreasing: put the NdFeB magnet with a size of 10×10×10mm into the alkaline degreasing liquid, and degrease at a temperature of 65°C for 10 minutes to remove the oil stain on the surface of the magnet. The formula of the degreasing liquid used is:

[0037] Sodium carbonate (Na 2 CO 3 ) 25g / l sodium phosphate (Na 3 PO 4 .12H 2 O) 10g / l

[0038] Sodium silicate (Na 2 SiO 3 ) 5g / l Surfactant 1~2ml / l pH: 9~10

[0039] (2) Rust removal: Put the magnet in the rust removal solution and soak it at room temperature for 25s to remove the oxide film on the surface of the magnet. The formula of the rust removal solution used is:

[0040] Nitric acid (65%) 70~80ml / l Corrosion inhibitor 0.5~1%

[0041] (3) Vacuum aluminum plating: put the magnet into the vacuum coating chamber, start the vacuum pump to evacuate the coating chamber, and heat the NdFeB magnet to keep the temperature at 280°C. When the vacuum degree reaches 5×10 -3 At the same time, the magnet is aluminum-...

Embodiment 2

[0050] (1) Degreasing: put the NdFeB magnet with a size of 10×10×10mm into the alkaline degreasing liquid, and degreasing at a temperature of 50°C for 15 minutes to remove the oil on the surface of the magnet. The formula of the degreasing liquid used is:

[0051] Sodium carbonate (Na 2 CO 3 ) 25g / l sodium phosphate (Na 3 PO 4 .12H 2 O) 10g / l

[0052] Sodium silicate (Na 2 SiO 3 ) 5g / l Surfactant 1~2ml / l pH: 9~10

[0053] (2) Rust removal: Put the magnet in the rust removal solution and soak it at room temperature for 20s to remove the oxide film on the surface of the magnet. The formula of the rust removal solution used is:

[0054] Nitric acid (65%) 70~80ml / l Corrosion inhibitor 0.5~1%

[0055] (3) Vacuum aluminum plating: Put the magnet into the vacuum coating chamber, start the vacuum pump to evacuate the coating chamber, and heat the NdFeB magnet to keep the temperature at 260 °C. When the vacuum degree reaches 4×10 -3At the same time, the magnet is aluminum-coat...

Embodiment 3

[0064] (1) Degreasing: put the NdFeB magnet with the size of 10×10×10mm into the alkaline degreasing liquid, and degreasing at a temperature of 65°C for 5 minutes to remove the oil on the surface of the magnet. The formula of the degreasing liquid used is:

[0065] Sodium carbonate (Na 2 CO 3 ) 25g / l sodium phosphate (Na 3 PO 4 .12H 2 O) 10g / l

[0066] Sodium silicate (Na 2 SiO 3 ) 5g / l Surfactant 1~2ml / l pH: 9~10

[0067] (2) Rust removal: Put the magnet in the rust removal solution and soak it at room temperature for 20s to remove the oxide film on the surface of the magnet. The formula of the rust removal solution used is:

[0068] Nitric acid (65%) 70~80ml / l Corrosion inhibitor 0.5~1%

[0069] (3) Vacuum aluminum plating: Put the magnet into the vacuum coating chamber, start the vacuum pump to evacuate the coating chamber, and heat the NdFeB magnet to keep the temperature at 280°C. When the vacuum degree reaches 6×10 -3 At the same time, the magnet is aluminum-coa...

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Abstract

The invention discloses a vacuum aluminizing/cathode electrophoresis composite protective technique for an NdFeB magnet, which relates to a surface treatment protective technique for an NdFeB magnet and an NdFeB magnet with a composite protective layer. The invention aims to provide a vacuum aluminizing/cathode electrophoresis composite protective technique for an NdFeB magnet, which has the advantages of high production efficiency and high corrosion resistance, and an NdFeB magnet with a composite protective layer composed of a vacuum aluminizing film and an electrophoresis epoxy resin paint film. The vacuum aluminizing/cathode electrophoresis composite protective technique for an NdFeB magnet comprises the following steps: (1) removing oil and rust from an NdFeB magnet; (2) carrying out vacuum aluminizing on the NdFeB magnet; (3) carrying out surface finish and passivation on the NdFeB magnet subjected to the vacuum aluminizing; (4) carrying out cathode electrophoresis on the NdFeB magnet, wherein the cathode electrophoresis liquid is single-component epoxy resin paint or double-component epoxy resin paint; and (5) drying and curing the NdFeB magnet subjected to the cathode electrophoresis.

Description

technical field [0001] The invention relates to a surface treatment and protection process for NdFeB magnets, in particular to a composite protection process that combines vacuum aluminum plating and cathodic electrophoresis, and a composite coating with vacuum aluminum plating film and cathodic electrophoresis epoxy resin paint film. NdFeB magnets with protective layer. Background technique [0002] As the third-generation rare earth permanent magnet material, NdFeB magnets have extremely high magnetic energy product and coercive force, and the advantages of high energy density make them not only widely used in information technology, automobiles, nuclear magnetic resonance and motors, but also in wind power The application of environmentally friendly new energy fields such as power generation and hybrid vehicles is also increasing. The high magnetic energy of NdFeB stems from its special chemical composition and metallographic structure: NdFeB magnets are composed of Nd-r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C23C14/16C25D13/06H01F1/057H01F7/02
Inventor 于永江尼洪香邵梅竹李岩耿国强杨晓静
Owner YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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