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How do NdFeB neodymium magnets handle plating problems?
Time:11/30/2018
The Everbbeen neodymium iron boron magnet is obtained by mixing, pressing and sintering the ultrafine powder of cerium, lanthanum, iron and boron after screening. Machined into different shapes according to the needs of the product. Since the chemical properties of NdFeB materials are relatively active and easily oxidized, the finished products need to be electroplated. However, the quality of the electroplating coating is closely related to its pretreatment. This pretreatment process generally includes processes such as degreasing, rust removal, and activation. If such a pre-treatment process is not cleaned, it will bring latent defects to the final electroplating product, causing problems such as foaming and peeling of the plating layer. Defective magnetic material parts will lose their marketing value and be scrapped. If a magnetic material part with a concealed defect is applied to the equipment, it may cause the whole machine to malfunction due to the failure of the unqualified part. Even serious consequences.
 
Everbbeen neodymium iron boron magnets are not as dense as forged metal materials. It is a microporous material. Its porosity brings many difficulties and troubles to the pre-plating treatment. In addition to removing the alkaline, acidic substances on the surface of the workpiece and the dirt brought in by the process, the biggest difficulty is how to remove the dirt from the micropores.
 
 
Everbbeen neodymium iron boron magnet
For low-grade magnetic materials that are generally not demanding, the pre-treatment processes used in the past are: alkaline degreasing - washing - pickling (bleaching, neutralization) - washing - surface activation - electroplating. Although the process is simple, it has high requirements for degreasing agents, and it requires a special degreasing agent for deuterium-iron-boron. This degreasing and degreasing agent has a complicated formula and requires many kinds of raw materials. The user preparation process is very trouble. And once the ratio is improper, it will fail and the utility will be poor.
 
This problem has been solved since the advent of high-power ultrasonic cleaners in industrial production. The unique cavitation effect of ultrasonic cleaning enables the alkaline and acidic substances remaining in the micropores of magnetic materials to be completely removed.
 
 
Everbbeen magnet manufacturer
After ultrasonic cleaning, the pretreatment process of neodymium-iron-boron magnetic materials is generally:
 
(1) Alkaline degreasing - water bleaching - water bleaching - ultrasonic fine bleaching - dilute nitric acid treatment (neutralization, bleaching) - water rinsing - water rinsing - ultrasonic fine bleaching - activation treatment - electroplating
 
(2) Alkaline degreasing - water rinsing - water rinsing - ultrasonic fine bleaching - dilute nitric acid (neutralization, bleaching) treatment - water rinsing - water rinsing - ultrasonic fine bleaching - activation treatment - water rinsing - water rinsing - ultrasonic fine bleaching - plating
 
(3) Ultrasonic 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 -plating