SmCo magnet is a high performance,low temperature coefficent permanent magnet made of samarium and cobalt and other rare-earth elements.Its biggest advantage is its high working temperature---350 degree centigrade.It needn't to be coated because it is difficult to be eroded and oxidized.SmCo magnet is widely used in motors,watch,transducers,instruments,positional detector,generators,radar and etc. NdFeB magnet is mainly made of Neodymium,Iron and Boron,with excellent magnetic property,abundant raw material and reasonable prices,NdFeB Magnet can be used as an ideal magnet in mini-motor,Permanent magnetic resonance,sound device magnetic suspension system,magnetic transmission machine and iatrical apparatus and etc.For NdFeB,its surface is usually treatd with some special methods.The surface treatment method include Zine,Nickel,Tin,Silver,Gold plating,Phosphor and Spray Epoxy Resin etc.