As a rare earth permanent magnet ndfeb magnet a magnetic energy product and high coercive force, high energy density at the same time make the advantages of ndfeb permanent magnet material in modern industry and the wide application of electronic technology, so that the instruments and meters, electronic motor, magnetization of the magnetic separation equipment miniaturization, lightweight, thin become possible.
The advantage of ndfeb is cost-effective, good mechanical properties;
Ndfeb contains a large number of rare earth elements, neodymium iron and boron, its characteristics of hard and brittle.
At the same time, such as neodymium rare earth metals is very lively, make the material is easy to be pulverization corrosion, must take through surface treatment or adjust its chemical composition to improve, to reach the requirements of practical application.
Because adjusting composition will change its properties, the surface treatment is more important.
Ndfeb using chloride commonly used galvanized galvanized, look from domestic production, is the biggest plating galvanized, especially electric bicycle magnetic steel plating is more outstanding.
Zinc plating advantage is cheap, convenient, not ferromagnetic.
The disadvantage is that wear resistance, weatherability than nickel plating layer.
After galvanized coating generally must carry on the passivation, eliminated hexavalent chromium passivation, because at present commonly used passivation is trivalent chromium passivation and trivalent chromium passivation colour blue and white.
Galvanized passivation, of course, also can be like hardware more rich;
But, at present the mainstream is trivalent chromium passivation of white and blue.