Neodymium or NdFeB is a new type of strong magnetic material, composed of neodymium, iron, boron and other elements. It is widely used in motors, generators, computers, communications, aerospace and other fields due to its high magnetic energy, high coercive force, high magnetic permeability and high stability.
In order to better use the performance of NdFeB, surface painting is required. Surface painting can not only improve the magnet corrosion resistance, but also improve its oxidation resistance, thereby improving its stability and service life.
Befor we start the actual painting, the magnet surface needs to be pretreated to remove surface dirt, oxide layer and impurities. The general pretreatment includes chemical degreasing, ultrasonic cleaning, electrolytic degreasing and other steps to remove surface dirt and oxide layer to achieve a certain surface roughness.
After pretreatment cleaning, spray painting can be performed. The coating materials that can be used for magenet painting are epoxy resin, polyester resin, acrylate, etc. These coating materials can form chemical bonds with the surface of NdFeB magenet to improve the coating adhesion, and also improve its corrosion resistance and oxidation resistance.
During the magnet painting process, we need pay attention to the paint uniformity and density. The coating should evenly cover the entire surface of NdFeB magnet, and there should be no defects such as pores and cracks inside the coating. At the same time, the thickness of the coating should also be controlled within a certain range to avoid adverse effects on the performance of NdFeB.
After painting done, curing should be followed seamlessly. Curing can be thermal heating or ultraviolet irradiation. Heating curing can improve the hardness, wear resistance, corrosion resistance and stability of the coating, ultraviolet irradiation curing can save energy and time, and will not pollute the environment but its limited to specific paint only.
After finished above steps, the magenet painting treatment is completed.
Magnetic painting equipment, mainly including NdFeB grain boundary diffusion equipment, magnetic material epoxy spraying production line, ferrite soft magnetic electrostatic spraying equipment, adopts high-precision spraying and precise temperature control to achieve uniform film thickness and meet the salt spray test standards. This equipment has very accurate control of coating thickness and can ensure the quality and stability of the coating.
With robotic paint group, we provide our clients a variety robotic painting solutions to meet with specific production needs. Each setup can be deeply tailored according to required treatment process and area space limitation etc. The final painted magnet is 100% fine with salt spray test standards. Our precise devices performing extremely well in coating thickness control, product quality and fine rate, energy saving and environmental protection, etc., can meet the market demand for high-quality magnetic materials painting production.
