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How to clean impurities in NdFeB permanent magnet materials when finishing?
Mar 29, 2018

How to clean impurities in NdFeB permanent magnet materials when finishing?

We all know that the process of neodymium-iron-boron magnets is basically carried out in a vacuum environment, and impurities are not easily mixed in. Because the chemical properties of NdFeB permanent magnet materials are relatively active, impurities are incorporated in the oxidation of metals. Therefore, the finished product needs to be plated and coated. However, the quality of electroplating coating has a close relationship with its pretreatment. This processing technology generally includes: degreasing, derusting, and activation. In this pretreatment process, if one of the processes is not clean, it will cause problems such as blistering and flaking of the plating layer. If such defective NdFeB magnet parts are installed on the equipment, it is likely to cause the entire machine to malfunction.

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Forging metal materials are more precise than neodymium-iron-boron permanent magnet materials, and neodymium-iron-boron permanent magnet materials are microporous materials, and its porosity brings many difficulties and time-consuming to electroplating pretreatment. In addition to removing the alkaline, acidic substances on the surface of the workpiece and the dirt brought into the process, consider how to remove the dirt from the pores.

 

For low-grade permanent magnetic materials, which are generally not required, the previous pretreatment processes are: alkaline degreasing - water washing - pickling - water washing - surface activation - electroplating. This process is relatively simple, but it has high requirements for degreasing agent, and it needs special degreasing agent for neodymium iron and boron. The formulation of this degreasing and degreasing agent is complicated, and there are many types of raw materials needed. The user's preparation process is very troublesome. . Since the emergence of high-power ultrasonic cleaners in industrial production, these problems have been solved one by one. The unique cavitations effect of ultrasonic cleaning can make the alkaline and acidic substances in the pores of the permanent magnetic material get better clearance!