It is well known that because the chemical properties of NdFeB-NdFeB magnet materials are relatively active and easily oxidized, their products must be electroplated. However, the quality of the electroplating coating is closely related to its pretreatment. This pretreatment process usually includes processes such as degreasing, derusting and activation. If there is a process in this pre-treatment process that is not clean, it will bring hidden defects to the electroplating products, resulting in the occurrence of foaming, optimization, and peeling. If a permanent magnet material part with a latent defect is applied to the equipment, it will probably cause the whole machine to malfunction due to the failure of the unqualified part. Even causing tense consequences.
The NdFeB NdFeB magnet material is not as dense as the forged metal material, and is a microporous material. Its porosity brings many difficulties and troubles to the pre-plating treatment. In addition to removing the alkaline, acidic substances and dirt introduced by the process, it is also necessary to consider how to remove the dirt in the micropores.
For low-grade permanent magnet materials that are not normally required, the pretreatment processes used in the past are: alkaline degreasing-washing-pickling-washing-appearance activation-plating. Although the process is simple, it has high requirements on the degreaser. It is necessary to use the degreaser degreaser for the NdFeBN-iron-boron magnet. The formula of the degreaser is complicated, and the necessary materials are various. The process is especially troublesome.
This problem has been solved since the advent of high-power ultrasonic cleaners in industrial production. The unique cavitation effect of ultrasonic cleaning can make the alkaline and acidic substances remaining in the micropores of permanent magnet materials get better eliminated!