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Sintered NdFeB magnets is mainly made from neodymium, iron and boron. With excellent magnetic properties, abundant raw meterial and reasonable price, NdFeB Magnet is used as an ideal magnet in mini motor, permanent magnet instrument,  electronics industry, automotive industry, petrochemical, magnetic resonance imaging,sound device, magnetic suspension system, magnetic transmission machine and medical apparatus etc. For NdFeB, if let 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, but nickel is the most common and usually preferred. Some other options for coating are zinc and epoxy etc.