NdFeB magnetic material, as a result of the latest development of rare earth permanent magnet material, because of its excellent magnetic properties and are called "Magneto." NdFeB magnetic material is an alloy of praseodymium neodymium metal, such as iron and boron. Also known as magnet. NdFeB has high energy product and coercive force, while the advantages of high energy density make NdFeB been widely used in modern industrial and electronic technology, so that the instrumentation, electro-acoustic motors, magnetic magnetization and other equipment of small, lightweight, thin as possible. NdFeB advantage is cost-effective, with good mechanical properties; downside is that the low point of the Curie temperature, the temperature characteristics are poor, and easy-powder corrosion, must be improved so that by adjusting the chemical composition and surface treatment method adopted in order to achieve practical application. NdFeB, simply, is a magnet, and we usually see the magnet is different, its excellent magnetic properties and are called "Magneto." NdFeB contains large amounts of rare earth elements neodymium, iron and boron, which feature a hard and brittle. Since the surface easily oxidized corrosion, NdFeB must surface coating. Surface chemical passivation is one good solution. As a rare earth permanent magnet NdFeB material has a very high energy product and coercive force, while the advantages of high energy density make NdFeB been widely used in modern industrial and electronic technology, so that the instrument miniaturized instruments, electro-acoustic motors, magnetic separation equipment such as magnetic, lightweight, thin as possible. NdFeB advantage is cost-effective, with good mechanical properties; downside is that the low temperature, the temperature characteristics are poor, and easy-powder corrosion, must be improved so that by adjusting the chemical composition and surface treatment method adopted to meet the requirements of practical application.