Nickel electroplating method for bonded Nd-Fe-B magnet
A technology of neodymium iron boron and magnets, applied in the field of surface anticorrosion treatment, can solve the problems of poor coating, difficult electroplating, difficult to adopt, etc., and achieve the effect of improving the effect of nickel plating on the inner wall
Active Publication Date: 2008-10-08
溧阳常大技术转移中心有限公司
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Problems solved by technology
However, the above methods also have disadvantages. For example, after adding Cr element, the magnetic properties of the magnet will be lost and the dissolution of the magnet will be accelerated during strong cathodic polarization. Especially since July 1, 2006, after the implementation of the EU RoHS directive, Hexavalent chromium and divalent mercury are prohibited in electronic products, and the above methods are more difficult to adopt
However, the electroplating method for bonded NdFeB magnets has not been reported yet. The reason is that Shen Youzhi, how to solve the moisture-proof and anti-oxidation problem of bonded NdFeB magnets [J]. Micro-special Motor, 2005, (1), in 46 It is reported that because the conductivity of bonded NdFeB magnets is worse than that of sintered NdFeB magnets, it is easy to have poor coating or it is difficult to electroplate on its surface
Method used
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Embodiment 1
[0016] First, degrease and wash the bonded NdFeB magnet, then immerse it in Ni / Cu colloidal solution (Example 1 in Table 1) at 45°C for 5 minutes, wash it, and then put it into a barrel plating tank for nickel plating , the temperature of the plating solution in the barrel plating tank is controlled at about 45°C, and its initial current density is 0.5A / dm 2 , after 10 minutes of electroplating, change the current density to 2A / dm 2 , electroplated for 30 minutes, washed with water, and dried with hot air. The evaluation results after barrel nickel plating are shown in Table 2.
Embodiment 2
[0018] The operation method is as in Example 1, the composition of the Ni / Cu colloid solution is as shown in Example 2 in Table 1, and the evaluation results after barrel nickel plating are shown in Table 2.
Embodiment 3
[0020] The operation method is as in Example 1, the composition of the Ni / Cu colloidal solution is as shown in Example 3 in Table 1, and the evaluation results after barrel nickel plating are shown in Table 2.
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The invention relates to superficial antiseptic treatment which is suitable for the small-sized bonded NdFeB magnet parts of the electronic expansion valve, the air conditioner motor, etc., in particular to a bonded NdFeB magnet barrel nickel plating method. Ni / Cu colloidal solution is used to perform preliminary treatment, and is composed of 1 to 50g / L of nickel sulphate and 0.1 to 20g / L of copper sulphate; complexing agent is organic compound which can perform complexing with nickel ion and copper ion simultaneously, the complexing agent is citric acid, tartaric acid, iminodiacetic acid, oxalic acid or anthranilic acid, the concentration range of the complexing agent is 1 to 35g / L, and the pH value of the Ni / Cu colloidal solution is 5 to 9. The bonded NdFeB magnet barrel nickel plating method has the advantages that after the bonded NdFeB magnet is treated through the Ni / Cu colloidal solution and conductive film is formed on the surface of the bonded NdFeB magnet, the bonded NdFeB magnet can be directly used for the nickel electroplating (barrel plating), and especially the inner wall nickel plating of the tubular bonded NdFeB magnet is greatly improved.
Description
technical field [0001] The invention is suitable for surface anticorrosion treatment of small-sized bonded NdFeB magnet components such as electronic expansion valves and air conditioner motors, and particularly refers to a barrel nickel plating method for bonded NdFeB magnets. Background technique [0002] NdFeB magnets have high magnetic field strength, high coercive force and large magnetic energy level at room temperature, especially in my country, where they are rich in resources, and generally have been widely used in the fields of motors, generators, sensors and instruments application. However, NdFeB magnets have strong chemical activity and poor corrosion resistance, which affects their application, so the research on anti-corrosion of NdFeB magnets is of great significance. [0003] The anticorrosion of bonded NdFeB magnets is a research hotspot, and there are many patent reports in literature, such as Zhang Shoumin, Zhou Yongqia, Nd-Fe-B magnet anticorrosion resea...
Claims
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Inventor 陈智栋王文昌孔泳许娟韩国防王金峰于清露赵炜
Owner 溧阳常大技术转移中心有限公司