Nd-Fe-B permanent magnet material is the third generation of new functional materials developed in 1980s and has been widely used in microwave communication, audio and video, instrumentation, electrical engineering, computer magnetic separation, magnetic therapy and other fields, becoming a new technology application The important material basis.
Due to the high content of Nd in the material, the chemical nature of the material is extremely active, so the material is easily oxidized in humid air and strongly reacted with the acid. Nd-Fe-B Taijin grain boundary Nd-rich phase exists, easy to produce intergranular corrosion, severe, resulting in a large number of Nd oxides and hydrides make the material of the powder. Due to selective corrosion, resulting in decreased magnetic properties. In addition Nd-Fe-B permanent magnet material is sintered by powder metallurgy products, the structure of the gun. Porosity, poor surface condition, brittleness too. If you do not take measures, due to the combination of coating and corrosion resistance is poor, will seriously affect the coating's protective properties.
In view of the above, the design of neodymium iron iron boron plating pretreatment process and test, Australia I test each coating adhesion, porosity and salt spray corrosion time, by comparing the data and the appearance of the coating, get more Good neodymium. Iron-boron material nickel pretreatment process and process specifications.
Article from NdFeB Industry Network