At present, the patent technology of
sintered NdFeB has been thawing in Japan, Germany and the European Union. And with the concerted efforts of the major sintering factories in China, the grade of sintered NdFeB has been greatly improved. As the field of high technology application, its comprehensive performance has been constantly improved, and its requirements for surface treatment of sintered NdFeB have also been greatly improved. And the traditional processing methods can no longer meet the requirements of the industrial chain to product related products,such as
neodymium magnets. The University of Electronic Science and Technology, the Sichuan University, the Chiao Tung University, and the Swiss Academy of Scientific Research, starting with the micro molecular structure, have perfected the principle of surface treatment and the development of industrial application technology in essence. After 4 years' efforts, the breakthrough has been made in the key technology. The technology of non-coating treatment of Nanoscale (3010) Chelating film is an uncoated technology. The active group containing the nano film has a strong effect on moisture, oxygen, chloride ion (Cl) and carbon dioxide (CO2). Its excellent surface physical and chemical properties will have a significant impact on the application field.
In December 2013, the processing technology was tested by Sichuan University and the CAS system. It showed that its corrosion resistance could be used for 20-30 years under the marine climate, and could be widely used in the sea based wind power generation. Its surface bonding force is more than 20Mpa, and it can be widely used in high speed permanent magnet motor, special motor, electric motor motor, UHV, HVDC power supply system, fast charging system, Aerospace Military Industry and other fields.
Common methods of surface treatment:
1. Nanometer (Royce 3010) chelating film without coating treatment; (3010 refers to the film containing has more than three active chelating groups, and the film thickness is 10 nanometers)
2. Phosphorization.
3. Electroplating.
4. Electrophoresis.
5. Vacuum vapor deposition.
6. Chemical plating.
7. Organic spray.
