Nd-added nd-fe-b permanent-magnetic material chemical plating fluid and method of use thereof

A permanent magnet material and chemical plating solution technology, which is applied in liquid chemical plating, metal material coating process, coating, etc., can solve the problems of prone to peeling, poor bonding force of the coating, and rough surface, so as to reduce the surface Energy, strong adsorption capacity, and the effect of increasing the nucleation rate

Active Publication Date: 2008-09-03
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the limitation of the preparation process of NdFeB material, its surface is rough and porous, resulting in poor bonding force of the coating, and it is easy to appear peeling and peeling.
The traditional electroless plating process still cannot fully meet the requirements of the bonding force of the coating, so it is of great significance to improve the bonding force between the coating and the substrate for its engineering application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1- Embodiment 10

[0023] Example 1-Example 10: The NdFeB magnets after pickling and activation were plated in alkaline plating solution for 1 hour.

Embodiment 1

[0025] Nickel Sulfate (NiSO 4 ·6H 2 O) 25g / l

[0026] Sodium hypophosphite (NaH 2 PO 2 ·H 2 O) 25g / l

[0027] Trisodium Citrate 30g / l

[0028] Malic acid 20g / l

[0029] Sodium acetate 20g / l

[0030] Neodymium sulfate 0.2g / l

[0031] Potassium iodate 8mg / l

[0032] water balance

[0033] The temperature of the plating solution is 83°C, and the pH value is adjusted to 9.3 with 5% sodium hydroxide solution. The solution passed the stability test, and the plating speed was 19.5 μm / h.

Embodiment 2

[0035] Nickel Sulfate (NiSO 4 ·6H 2 O) 30g / l

[0036] Sodium hypophosphite (NaH 2 PO 2 ·H 2 O) 30g / l

[0037] Trisodium Citrate 30g / l

[0038] Malic acid 20g / l

[0039] Sodium acetate 20g / l

[0040] Neodymium sulfate 0.4g / l

[0041] Potassium iodate 8mg / l

[0042] water balance

[0043] The temperature of the plating solution is 85° C., and the pH value is adjusted to 9 with ammonia water. The solution passed the stability test, and the plating speed was 19.3 μm / h.

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Abstract

The invention discloses a neodymium-added Nd-Fe-B permanent-magnet material chemical plating solution and a use method. In the plating solution, nickel vitriol is used as the main salt, sodium hypophosphite is used as the reducer, sodium citrate or malic acid is used as the complexing agent, sodium acetate is used as the buffering agent, potash iodate is used as the stabilizing agent, and a small amount of neodymium is added. The use method comprises the following steps: the pH value of the chemical plating solution is adjusted by 5% to 10% of sodium hydroxide solution or ammonia to 9 to 10, the optimal pH value is 9 to 9.5, the plating solution is heated to 70 DEG C to 85 DEG C, the optimal constant temperature is 80 DEG C to 85 DEG C, oil-removed and activated Nd-Fe-B magnet is dipped into the plating solution, then a plating layer is acquired. According to the invention, because of the strong adsorption capacity, neodymium is aggregated on the surface of the magnet, the corrosion of neodymium-rich phase is inhabited, and the deposition speed is improved, the bonding force of the surface coating of the Nd-Fe-B magnet is obviously increased. In addition, coating got by the method has superior corrosion resistance, and the technical difficulty of poor bonding force of the surface coating of the Nd-Fe-B magnet is solved.

Description

technical field [0001] The invention relates to an electroless plating solution for NdFeB permanent magnet materials added with neodymium and a use method thereof. Background technique [0002] The third-generation rare earth permanent magnet NdFeB material has high saturation magnetization, magnetic energy product and coercive force. At the same time, due to its abundant resources and low price, it has been widely used in the electronics industry, automobile manufacturing, metallurgical industry, It has been widely used in instrument manufacturing industry and medical equipment manufacturing. However, in a humid environment, NdFeB materials are prone to intergranular corrosion due to the presence of Nd-rich phases, and their corrosion resistance is poor; in addition, NdFeB materials will oxidize under high temperature working conditions to cause hard magnetism Phase Nd 2 Fe 14 The loss of B seriously deteriorates its magnetic properties. Therefore, it is extremely impor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/36
Inventor 严密吴元騄
Owner ZHEJIANG UNIV
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