Artificially formed on the surface of the substrate material and the substrate of the mechanical, physical and chemical properties of the surface of different processes. The purpose of surface treatment is to meet the corrosion resistance, wear resistance, decoration or other special function requirements.
For metal castings, we are more commonly used surface treatment methods are mechanical grinding, chemical treatment, surface heat treatment, spraying the surface.
NdFeB magnetic material is neodymium, iron oxide and other alloys. Also known as magnet.
NdFeB magnetic material grades are: N30 ~ N52; 30H ~ 50H; 30SH ~ 50SH; 28UH ~ 40UH; 30EH ~ 35EH and so on.
The third generation of rare earth permanent magnet NdFeB is the most powerful permanent magnet in the contemporary magnet. Its BHmax value is 5-12 times that of ferrite magnets, 3-10 times that of AlNiCo magnets; its coercive force is equivalent to 5-10 times that of ferrite magnets, 5- 15 times its potential high magnetic properties, can absorb the weight equivalent to 640 times its own weight.
As the main raw material of NdFeB magnet iron is very cheap, the storage of rare earth neodymium 10-16 times more than samarium, so the price is much lower than the SmCo magnet.
The mechanical properties of neodymium-iron-boron magnets are better than those of samarium-cobalt magnets and alnico magnets, making them easier to cut and drill and complex shapes.
The disadvantage of the NdFeB magnet is its poor temperature performance, high magnetic loss at high temperature and high maximum working temperature. Generally about 80 ℃, after special treatment of the magnet, the maximum operating temperature up to 200 ℃.
As the material contains a lot of neodymium and iron, so easy to rust is also a major weakness. Therefore, NdFeB magnets must be surface coating. Electroless nickel (Ni), zinc (Zn), gold (Au), chromium (Cr), epoxy (Epoxy) and so on.
NdFeB surface passivation to prevent rust and produce speckle
The main components: metal surface passivation agent, film, surfactant, buffer, poly agent and so on.
Referred to as: Royce-799 series
Scope of application: Suitable for NdFeB materials, cast iron, powder metallurgy and other materials directly passivated surface
Physical Appearance Light yellow transparent liquid
Recoating agent> 20%
Other active agents> 4%
This product is Kunshan Ruishi Lesi company R & D department specifically for the NdFeB magnetic materials developed a new environmentally friendly environmentally friendly passivation indicators comply with the RoHS directive; Pharmacy with a special buffer system to overcome the corrosion of the workpiece surface and internal, blunt The performance is stable.
The product is easy to use, easy to use, with a long time placed in the air is not rusty characteristics, the passivation film uniform uniform metallic luster film, the passivation film lattice distortion of the plane Y-Fe3O4. After passivation ordinary steel salt spray test 96 hours, up to nine or more.
1. Using craft
The use of stock solution concentration
Processing temperature at room temperature
Treatment method soak
Processing time 100-300 seconds
2. Process flow (refer to the process operation instructions)
Workpiece Degreasing --------- Washing --------- Pickling ------- Washing ---------- Invade Royce-799 Passivating Agent (120 -180s) -------- Royce-789 blocking agent (10-20s) ---------- Baking.
1. No direct contact with acid and alkali
2. This product should not be in direct contact with the human body, see MSDS;
This product storage Note: dark, cool, dry.
Article from NdFeB Industry Network