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NdFeB magnet is mainly made from neodymium, iron and boron. With excellent magnetic property, abundant raw material and reasonable prices, NdFeB Magnet is used as an ideal magnet in mini-motor, magnetic resonance imaging, sound device, magnetic suspension system, magnetic transmission machine and iatrical apparatus and etc. For NdFeB, if left it exposed, the iron in the magnet will rust. To protect the magnet from corrosion, it is usually preferable for the magnet to be coated. There are a variety of options for coatings, but nickel is the most common and usually preferred. Some other options for coating are zinc and epoxy.