Processing technology of NdFeB magnet surface coating

What is the treatment process for the surface coating of NdFeB magnets? NdFeB permanent magnet material is a highly active powder metallurgy material, which is prone to corrosion. Therefore, when surface treatment, appropriate pretreatment and electroplating processes should be carefully selected. Before the sintered NdFeB permanent magnet material is electroplated, it must go through chamfering, degreasing, pickling, ultrasonic cleaning and other processes that can stabilize and clean the surface, so as to obtain a coating with good bonding, low porosity and long-lasting corrosion resistance.

When choosing an electroplating process, it is necessary to consider not only the protection and production practicability of the process, but also the impact and degree of damage caused by electroplating emissions to the environment.

The main components of NdFeB are neodymium and iron, which are easy to rust. Therefore, NdFeB must be surface-coated. Surface chemical passivation is one of the best solutions at present. We have advanced epoxy technology, which can meet the salt spray test for 500-1000 hours. NdFeB has the advantages of extremely high magnetic energy product and coercive force, as well as high energy density, high cost performance, and good mechanical properties; the disadvantage is that the magnetic transition point is low, the temperature characteristics are poor, and it is easy to pulverize and corrode. It must be adjusted by adjusting Its chemical composition and surface treatment methods can be improved to meet the requirements of practical applications.

In the descaling and anti-scaling industry of NdFeB magnets, after the water is treated by high-strength NdFeB magnetization, the water molecular bonds are deformed at the same time in the firing angle and length, and the hydrogen bond angle is reduced from 105 degrees to about 103 degrees. The physical and chemical properties have undergone a series of changes, and the activity and ablation degree of water have been greatly improved. Calcium carbonate in the water is flatly decomposed to form a relatively solid calcium bicarbonate during the cooking process, which is not easy to accumulate on the wall and is easily taken away by water. The degree of polymerization of other water increases, and the dissolved solid materials become finer particles. After the particles are refined, the distance between the two ions is small, and it is not easy to agglomerate on the wall, and then achieve the effect of descaling.

Rare earth functions are mainly based on high-performance NdFeB permanent magnet materials in the industry, and high-performance NdFeB permanent magnet materials are mainly used in high-end application markets such as new energy and energy conservation and environmental protection, such as EPS, new energy vehicles, etc.