Nd-added nd-fe-b permanent-magnetic material chemical plating fluid and method of use thereof
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A technology of permanent magnet material and chemical plating solution
Inactive Publication Date: 2009-09-16
ZHEJIANG UNIV +1
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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
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Embodiment 1 1 example 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 an electroless plating solution for NdFeB permanent magnet materials added with neodymium and a use method thereof. It uses nickel sulfate as the main salt, sodium hypophosphite as the reducing agent, trisodium citrate or malic acid as the complexing agent, sodium acetate as the buffer, potassium iodate as the stabilizer, and a small amount of neodymium. How to use: first use 5% to 10% sodium hydroxide solution or ammonia water to adjust the pH value of the chemical plating solution to 9 to 10, the optimum pH value is 9 to 9.5, and then heat the plating solution to 70 to 85 ℃, the best constant temperature is 80-85 ℃, and the degreasing and activated NdFeB magnets are immersed in the plating solution to obtain the coating. The invention uses the strong adsorption capacity of neodymium to gather on the surface of the magnet, inhibits the corrosion of the neodymium-rich phase, increases the deposition speed, and significantly improves the binding force of the coating on the surface of the neodymium-iron-boron magnet. Moreover, the coating obtained from this formula has excellent corrosion resistance, which solves the technical problem of poor bonding force of the NdFeB surface coating.
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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