Sintering process of iron boron magnet materials

Sintering process of iron boron magnet materials
Before sintering and electroplating, NdFeB magnet materials must go through chamfering, degreasing, pickling, ultrasonic cleaning and other processes to obtain a stable and clean surface. Magnet manufacturers can obtain a coating with good bonding, low porosity and durable corrosion resistance.
Chamfering Small parts can be chamfered by centrifugal finishing machine, and larger parts can be chamfered by spiral vibration or centrifugal vortex finishing machine after grinding edges with grinding machine. The chamfering of the magnet manufacturer shall be carried out in neutral or slightly alkaline medium. It is prohibited to use acidic or corrosive medium for chamfering.
Degreasing should be carried out in neutral and weakly alkaline degreasers. In order to avoid oxidation or hydrogen permeation, it is better not to conduct anodic or cathodic electrolytic treatment. The magnet manufacturer shall conduct acid pickling with dilute nitric acid solution or weak organic acid for a short time, but shall not conduct acid pickling in strong halogen acid, and must not conduct acid pickling in high concentration strong acid, otherwise, the material surface will be rapidly roughened or even powdery