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How to choose NdFeB magnet coating and demagnetization

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Strong neodymium iron boron magnets contain a large amount of iron, so they have poor corrosion resistance and are easy to rust when exposed to air. Therefore, it is generally necessary to perform phosphating treatment, namely electroplating, on the surface of the finished NdFeB magnet.


What kind of coating effect is good for neodymium iron boron strong magnet? First of all, we should know which coatings can be used for neodymium iron boron.


The common coatings of neodymium iron boron strong magnets are nickel, zinc, chromium, black zinc, black nickel, blue and white zinc, gold, silver, epoxy resin, etc. The different types of electroplating make the magnet surface color different, and the length of storage time is also different.


After comparative studies, the effect of nickel, zinc, epoxy resin and other coatings on the magnetic properties of neodymium iron boron magnets in three solutions shows that: in acid, alkali, and salt environments, polymer materials are coated with epoxy resin and nickel The protection effect of the magnet is very good, and the zinc coating is better. However, due to the complexity of the epoxy resin process and the high price and cost, in most cases, direct nickel coating can achieve good results. For products with strict requirements on product performance and appearance, nickel coating is a good choice; products that do not have high requirements are directly coated with zinc. The choice of coating should be selected mainly according to the environment in which the product is used, and the right one is the best! As the king of magnets, NdFeB will also cause demagnetization? Most people may not understand. It turns out that the reason why NdFeB demagnetizes in a high-temperature environment is determined by its physical structure.


Neodymium iron boron magnet


The reason why a magnet can generate a magnetic field is because the electrons carried by the substance itself rotate in a certain direction around the atom, thereby generating a certain magnetic field force, which in turn has an impact on the surrounding affairs.


But most people ignore the fact that there are certain temperature conditions for electrons to rotate around atoms in a given direction: different permanent magnetic materials can withstand different temperatures, and if the temperature is too high, the electrons will deviate. The original track causes chaos. At this time, the magnetic field of the magnetic substance itself will be disrupted, resulting in demagnetization.


The Curie temperature of neodymium iron boron is 320°C-460°C, and the temperature resistance is about 200°C, that is, demagnetization will occur if it exceeds this degree.


After we understand the effect of temperature resistance on NdFeB, we know how to deal with the demagnetization of NdFeB.


1. Don't put the NdFeB magnet product in excessively high temperature, especially pay attention to its critical temperature, and adjust its working environment temperature in time to minimize the occurrence of demagnetization.


2. Starting with technology, improve the performance of the product, so that it can have a structure that is more suitable for temperature, and is not easily affected by the environment.


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