Magnethome

     As we all know, electroplating the surface of neodymium magnets is a common method to extend their service life. However, when operating in humidity or sea water, the coating on the surface of neodymium magnets may also fall off or be corroded. Among them, for custom epoxy-coated neodymium magnets, salt dissolution reaction is one of the common reasons.          Next we are going to introduce some reasons that may cause the epoxy coating to peel off. We hope it will be helpful to you.      1.Improper surface preparation:        The adhesion of epoxy coatings is highly dependent on the quality of the surface preparation. If there are impurities such as oil, water vapor, and dust on the surface of the neodymium magnet, it will seriously affect the adhesion between the paint and the base layer, causing the epoxy resin to fall off.        2. Improper operation：        Neodymium magnets with epoxy plating may be subject to physical damage during use or handling, such as being struck, scratched, or bent, which may cause the coating to peel off. If the thickness of the epoxy resin coating is too thin, or the coating is exposed to water without being fully cured, it will cause the epoxy resin texture to crack and fall off.        3. Poor raw materials：        The quality of paint is directly related to the adhesion performance of the coating. If there are problems with the coating formula, production process, raw material selection, etc., such as containing volatile organic compounds and water, and inappropriate viscosity and solid content, it will easily cause the epoxy resin to fall off.          4.Bad working environment：        First of all, the construction of epoxy resin coatings requires that the ambient temperature is generally no less than 5°C. Exceeding the construction temperature range or improper air flow control may cause the epoxy resin to fall off. Secondly, in a humid environment, epoxy resin easily absorbs moisture, resulting in longer curing time or incomplete curing, which can easily lead to falling off. Finally, strong epoxy coated neodymium magnets may react when in contact with certain chemicals, causing damage to the coating. In particular, strong acids, alkalis or corrosive solutions may damage the coating.        To reduce the risk of coating peeling, choose neodymium magnets with good coating quality to ensure high durability and coating adhesion; handle magnets with care and avoid hitting, scratching or bending them; avoid Exposing neodymium magnets to chemicals such as strong acids, alkalis, or corrosive solutions, etc.          If you find that the coating of a neodymium magnet is peeling off, you should stop using it and consider recoating or replacing the neodymium magnet to ensure its proper functioning and protection, welcome to consult with professional neodymium magnet manufacturers.            

     The core of a magnetic field is the area around a magnet where magnetic forces are exerted. Magnetic fields are usually generated both through magnetic materials and through moving electric charges. Magnetic fields are invisible but can be detected using certain tools and materials. For example, in strong neodymium magnet materials, the magnetic field is generated by the arrangement of the magnetic moments of electrons within the material and is an inherent property of substances such as iron, nickel and cobalt.    Common magnetic field applications in life        1. Magnetic cards and magnetic strips: Commonly used magnetic cards such as bank cards, credit cards, access control cards, etc. all contain magnetic strips. These magnetic strips contain specific magnetic field codes used to store and read data.        2. Speaker: The speaker generates vibration in the magnetic field through electric current, thereby producing sound. They are widely used in audio systems, televisions, computers and other equipment.        3. Electronic devices: Storage devices such as hard drives and magnetic tapes use magnetic fields to read and write data, and are widely used in computers and data storage.        4. Motors and generators: Motors and generators are devices that convert electrical energy into mechanical energy using magnetic fields generated by custom curved neodymium magnets. Widely used in power tools, household appliances, transportation and other fields.        5. Magnetic Resonance Imaging (MRI): MRI uses powerful magnetic fields and harmless radio waves to produce detailed images of the inside of the body, which is important for diagnosis and medical research.          Magnetic fields are not just theoretical or used in advanced science. They are used in many aspects of modern life.        Different magnetic fields of magnets        1. Magnetic field of independent neodymium magnet in free space        For a custom strong ndfeb magnet in an independent space, the magnetic field is generated by two polarities (north and south poles) and forms magnetic field lines in the space. Magnetic field lines flow from the south pole of the magnet to the north pole, forming a closed loop. Near the magnet, the magnetic field lines will be denser, indicating a stronger magnetic field; while farther away from the magnet, the magnetic field lines will become sparse, indicating a smaller magnetic field. The strength of the magnetic field gradually weakens with distance.        2. The magnetic field generated by the neodymium magnet on the steel plate        On the steel plate, the magnetic field of the magnet will be affected by the shielding effect of the steel plate, and the magnetic field distribution becomes more complex. The strength and distribution of the magnetic field will depend on the material and thickness of the steel plate and the distance between the magnet and the steel plate.        3. The magnetic field generated between two magnets        Depending on the relative position and polarity of the magnets, an attraction or repulsion effect may occur between the two magnets.   (1) Attraction effect: When the north and south poles of two magnets are close to each other, an attraction effect occurs between them. Magnetic field lines exit one magnetic pole and enter the other, forming a closed loop.   (2) Repulsion effect: When two magnets of the same polarity (two north poles or two south poles) are close to each other, a repulsion effect will occur between them. Magnetic field lines will try to spread out to minimize magnetic energy, so the magnets will push each other away.  

     Strong sintered neodymium magnets are widely used in household appliances, transportation, medical health, aerospace and other fields due to its ultra-high magnetic energy density (currently up to 1.5T on the market) and good service characteristics. In order to meet the use requirements of neodymium magnets in different fields and objectively evaluate the applicability and quality of the magnets, it is usually necessary to conduct various index tests on neodymium magnets. Generally speaking, we divide the testing content into three Aspects: First, product appearance size and physical properties; second, product magnetic properties; and third, product performance auxiliary testing items.     1. Appearance size and physical performance testing        The appearance size and physical properties of neodymium products are the basic requirements for product use. A good product must not only meet the magnetic performance requirements, but also need various sizes, coatings, mechanical properties, etc. that conform to actual needs to meet basic assembly and use requirements in different environments.         Product dimensions and tolerances not only affect the assembly effect, but also affect the consistency deviation of magnetic properties, motor operation stability and energy consumption. In actual use, they have attracted more and more customer attention.     2. Magnetic performance testing        The magnetic properties of neodymium are the main requirements for use. Only products that strictly meet the magnetic properties requirements can fully exert their effectiveness in the fields we need and carry out stable applications. This requires us to strictly test the magnetic performance indicators of neodymium.        In terms of magnetic properties, in the early days, everyone focused on the two indicators of remanence Br and intrinsic coercive force Hcj. Now, more and more users are paying attention to magnetic moment and thermal demagnetization. In fact, we use neodymium magnets mainly for its two important characteristics, one is the magnetic energy density per unit volume, and the other is the magnetic stability of high-temperature operation. It is more reasonable to use magnetic moment and thermal demagnetization to evaluate. High performance NdFeB magnets selected using thermal demagnetization indicators will undoubtedly have better service reliability and higher cost performance.   NdFeB Magnets Performance Parameters Grade Br Hcb Hcj (Bh)max Tw Grade mT kGs kA/m kOe kA/m kOe kJ/m3 MGOe ℃ N35 1170-1220 11.7-12.2 >868 >10.9 >955 >12 263-287 33-36 ＜80 N38 1220-1250 12.2-12.5 >899 >11.3 >955 >12 287-310 38-39 ＜80 N40 1250-1280 12.5-12.8 >907 >11.4 >955 >12 302-326 38-41 ＜80 N42 1280-1320 12.8-13.2 >915 >11.5 >955 >12 318-342 40-43 ＜80 N48 1380-1420 13.8-14.2 >923 >11.6 >955 >12 366-390 46-49 ＜80 N50 1400-1450 14.0-14.5 >796 >10 >876 >11 382-406 48-49 ＜80 N52 1430-1480 14.3-14.8 >796 >10 >876 >11 398-422 50-53 ＜80   3. Auxiliary testing items        The auxiliary testing items of neodymium are mainly to check whether the product performance meets expectations during the production process and to verify whether there are any defects in the production process; when abnormal conditions occur or new products are developed, the product composition and appearance are analyzed and confirmed.        The above are the common testing items for neodymium magnets. We are a professional neodymium magnets manufacturer. If you want to know more about neodymium magnets, please feel free to contact us.    

     In our daily work and life, we cannot avoid coming into contact with powerful neodymium magnets. For example, we often use and carry home appliances, digital products, vehicles, mechanical equipment that we operate every day at work, and magnetic resonance imaging that we need to use when going to the hospital for physical examinations. Various magnetic fields are always around us. Many people are always worried about the impact of neodymium magnets on their health. Here is some popular science about whether powerful neodymium rare earth magnets are harmful to the human body, and how harmful they are!          The first is physical damage from powerful magnets. When you use neodymium magnets with relatively strong magnetic force at work, be careful not to get your hands caught. Otherwise, your skin and flesh may be injured at least, or your bones may be broken at worst. Because the powerful neodymium magnet is a permanent rare earth magnetic material, it is very fragile. Be careful to prevent falling and collision. There is also the need to keep it at a certain temperature.          Powerful neodymium magnet magnetic field and AC magnetic field radiation problems. Many people clearly feel their ears feel hot and have localized headaches after talking on the phone for more than half an hour. This is the harm caused by alternating current magnetic fields to the human body. In particular, high-frequency magnetic fields are more harmful to the body. However, even N52 strong neodymium magnets may have a magnetic field strength less than 10,000 Gauss. No scientific researchers have suggested that it will harm the human body or have other abnormal effects. The specific situation needs further verification.        When you go to the hospital for a physical examination and have a magnetic resonance imaging, the doctor will ask you to use a piece of radiation-proof cloth to cover key parts. Therefore, I personally think that magnetic radiation has some impact on the body. If your body is equipped with medical electronic equipment such as a pacemaker, it is recommended not to do work related to strong neodymium magnets, as this will cause great harm to the body.          Through the above analysis, we are usually inseparable from various magnetic materials and magnetic fields. How to protect ourselves from magnetic field interference and harm is to stay away from high-intensity magnetic fields as much as possible. Be extra careful when using powerful neodymium magnets at work to avoid harm to your body. In fact, various weak magnetic fields and permanent magnetic materials cause very little harm to the human body, so there is no need to be overly afraid.