Semi-conducting magnets NdFeB magnets must be rust after the procedure, the initial approach is to use a number of high-performance rust cleaning agent to rust, another one is emulsified oil rust, but the rust is not a long time to save At present the best rust methods: electroplating layer of protection, electroplating is divided into: Zinc / Nickel / Tin / epoxy coating / Parylene five kinds of plating methods.