Artificial magnets appeared in the eighteenth Century, but the process of making higher magnetic materials was slow until 1920s. Then, in 1948, made of ferrite, created in 70s (SmCo), samarium cobalt rare earth magnet Nd-Fe-B magnet was born in 1986, this is the world's strongest magnet up to now. The physical magnetic technology has been rapid development of NdFeB magnet materials also makes the components more compact, and quickly spread in the industry, China Nd-Fe-B magnet industry ushered in the rapid development of the new world. First, NdFeB , simply speaking, is a magnet, and we usually see the difference is that the magnet, because of its excellent magnetic properties and called "magnetic king."". Neodymium iron boron contains a large number of rare earth elements neodymium, iron and boron, its characteristics are hard and brittle. Because the surface is easily oxidized and corroded, NdFeB must be treated with surface coating. Surface ch...