Device for coating electrophoretic paint on cathode made of neodymium-iron-boron magnetic material under condition of zero emission and electrophoretic coating method

Abstract

The invention provides a device for coating an electrophoretic paint on a cathode made of a neodymium-iron-boron magnetic material under the condition of zero emission and a cathodic electrophoretic coating method by using the same. The device comprises a pretreatment tank, an electrophoresis tank, an overflow tank, an aftertreatment tank, a hanging tool, an ultrafiltrate storage tank, an ultrafilter, a spray tank, a collector and an ultrafiltrate cleaning tank. By the device, a product is subjected to spray cleaning and three-stage countercurrent cleaning by ultrafiltrate after being subjected to electrophoresis, the surface of the product is clean, and the product can be dried after being subjected to next deionized water spray cleaning, so that the problem that a cleaning agent is retained on the surface of a magnet to pollute the electrophoretic paint is solved, treatment work on an electrophoresis line is finished on the basis of environmental friendliness, the electrophoretic paint is recycled, and the zero emission of electrophoretic paint cleaning solution is realized.

Description

technical field [0001] The invention relates to the field of cathodic electrophoretic coating of NdFeB magnetic materials, in particular to a device for cathodic electrophoretic coating of NdFeB magnetic materials with zero discharge of electrophoretic paint and a cathodic electrophoretic coating method using the device. technical background [0002] NdFeB magnetic material is a magnet with high saturation magnetization, high coercive force and large magnetic energy product at room temperature. It is rich in resources and has a high cost performance. NdFeB permanent magnet materials are mainly made of rare earth metals such as neodymium, iron and boron through powder metallurgy technology. widely used. However, NdFeB magnets have the disadvantage of poor corrosion resistance, which seriously affects their application, so the anti-corrosion of NdFeB magnets is of great significance. [0003] NdFeB permanent magnet material is a porous material prepared by powder metallurgy ...

AI Technical Summary

Problems solved by technology

However, the electrophoresis production line of NdFeB permanent magnet materials is relatively small, and it is impossible to directly use the ultrafiltrate (UF liquid) in the electrophoresis tank for cleaning. Instead, the magnetic parts are cleaned with water, and the cleaning water of the electrophoretic paint is directly discharged, or after precipitation electrophoresis. After the paint is washed with water, it is discharged and treated, which pollutes the environment, so it does not meet the requirements of environmental protection

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