NdFeB is the screening of praseodymium, neodymium, iron, boron ultrafine powder after mixing, pressing, sintering. According to the needs of product use, machining into different shapes. As NdFeB material is relatively active in terms of chemical properties and is easily oxidized, NdFeB needs to be electroplated and coated. However, the quality of electroplating coating is closely related to its pretreatment. This pretreatment process generally includes degreasing, rust removal, activation and other processes. If there is a link in the pretreatment process is not clean, will bring latent defects to the final electroplating products, resulting in the plating layer blister, peeling and other problems. Defective magnetic material parts will lose their market value and be scrapped. If the magnetic material parts with hidden defects once applied to the equipment, may be due to this unqualified parts on the machine caused by the failure of the whole machine. There are even serious consequences.
NdFeB is not as dense as the wrought metal materials. It is a microporous material. Its porosity brings many difficulties and troubles to electroplating pretreatment. In addition to the workpiece surface to remove alkaline, acidic substances and processing brought into the dirt, the biggest difficulty is, how to remove the dirt in the micro hole clean.
For low-grade magnetic materials with low general requirements, the previous pretreatment processes used are: alkaline degreasing - washing - pickling (bleaching, neutralization) - washing - surface activation - electroplating. Although this process is simple, but it has a high requirement for degreasing agent, NdFeB special degreasing agent needs to be used. The formula of this kind of degreasing agent is complex and requires many kinds of raw materials. Therefore, the user's preparation process is very troublesome. And once match proportion is improper, can invalidate, practical poorer.
Since the industrial production of high-power ultrasonic cleaning machine, this problem will be readily solved. Ultrasonic cleaning unique cavitation effect can make residual in the magnetic material pores of the alkaline, acidic substances to be more thoroughly cleared.
After using ultrasonic cleaning, NdFeB magnetic material pretreatment process is generally:
(1) alkaline degreasing -- water bleaching -- water bleaching -- ultrasonic fine bleaching -- dilute nitric acid treatment (neutralization, bleaching) -- water bleaching -- ultrasonic fine bleaching -- activation treatment -- electroplating
(2) alkaline degreasing -- water rinse -- water rinse -- ultrasonic fine bleaching -- dilute nitric acid (neutralization, bleaching) treatment -- water rinse -- water rinse -- ultrasonic fine bleaching -- activation treatment -- water rinse -- water rinse -- ultrasonic fine bleaching -- electroplating
(3) ultrasonic basic degreasing -- water rinse -- water rinse -- ultrasonic fine bleaching -- dilute nitric acid (neutralization, bleaching) treatment -- water rinse -- water rinse -- ultrasonic fine bleaching -- activation treatment -- water rinse -- water rinse -- ultrasonic fine bleaching -- electroplating
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