Method for removing electroplating nickel on surface of neodymium iron boron permanent magnet material

Abstract

The invention provides a method removing electroplating nickel on the surface of a neodymium iron boron permanent magnet material. According to the method, oil removal and adhesive removal are firstly carried out on a neodymium iron boron permanent magnet material with an electroplating nickel layer on the surface by a cooking method; rust on the surface of the material is removed by the use of a rust cleaning solution; an activating treatment is carried out on the neodymium iron boron permanent magnet material by the use of an activating solution at room temperature; one or two of Resist K and sodium 3-nitrobenzenesulfonate are used as main salt chemical reagents, and two or three of sodium hydride, chlorine water or sodium hydroxide are used as auxiliary catalysts; one or two of sodium dodecyl sulfate and sodium citrate are used as stabilizing agents; a wetting fluid is added to prepare a mixed liquor; and by an ultrasonics sonochemistry method and under the mechanical energy action of ultrasonic vibrating, a nickel-removal chemical treatment of neodymium iron boron is carried out on the nickel layer on the metal surface by the use of the main salt chemical reagents and under the catalytic action. According to the invention, the method is efficient, the technology is simple, and production cost is low.

Description

technical field [0001] The invention relates to the field of surface chemical treatment of materials, in particular to a method for removing electroplated nickel on the surface of NdFeB permanent magnet materials. Background technique [0002] NdFeB permanent magnet material is a kind of magnetic material with good magnetic properties in modern times. After it is magnetized, it can pick up objects whose volume is more than 60 times its own volume. However, because NdFeB permanent magnet materials contain about 30% Neodymium is an element that is easily oxidized and forms gray powder on the surface. Therefore, NdFeB permanent magnet materials cannot be directly used to make magnetic parts, especially the magnetic pieces of computer hard drive magnetic components in the high-tech field. This magnetic component is used The magnetic sheet requires that its surface must have a good protective layer to meet the requirements. At present, the surface of the NdFeB permanent magnet ma...

AI Technical Summary

Problems solved by technology

However, in the actual production process of large-scale electroplating NdFeB permanent magnet materials, there will be many defects in NdFeB products. Problems in the electroplating process lead to uneven coating or large pores of NdFeB products, etc. Therefore, these NdFeB products that have been electroplated or partially electroplated need to be recycled and reused

[0003] However, due to the special electroplating nickel layer process on the surface of NdFeB permanent magnet materials, the nickel layer on the surface is often not cleaned cleanly. When the product is recycled (smelting process), the non-magnetic nickel element remains, resulting in the regeneration of NdFeB permanent magnet materials. Low magnetic properties

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