... is mainly made of Neodymium, Iron and Boron,.The surface treatment method include Zine, Nickel, Tin, Silver, Gold p ... magnetic transmission machine and iatrical apparatus and etc. For NdFeB, its surface is usually treally treatd with some special methods ... .The surface treatment method include Zine, Nickel, Tin, Silver, Gold plating, Phosphor and Spray Epoxy Resin etc. NdFeB magnet ...