A deplating solution for deplating nickel-tungsten-phosphorus electroplating layer on the surface of sintered NdFeB magnets, application of deplating solution and deplating process

Abstract

The invention discloses a deplating solution for deplating a nickel-tungsten-phosphorus electroplating layer on the surface of a sintered NdFeB magnet, an application of the deplating solution and a deplating process. The present invention finds that the deplating solution mixed with oxalic acid solution and phosphoric acid solution can be used as an electrolytic working solution for anodic electrolytic deplating of the nickel-tungsten-phosphorus electroplating layer on the surface of a sintered NdFeB magnet; the deplating process is in the deplating solution, The NdFeB magnet coated with nickel-tungsten-phosphorus electroplating on the surface is used as the anode, and the inert electrode is used as the cathode for anode electrolytic deplating; using the deplating solution of the present invention for electrolytic deplating can directly use the traditional electrolytic process without additional operations , the process is simple and mature, and it is safe and environmentally friendly; it can quickly and effectively remove the nickel-tungsten-phosphorus electroplating layer, and does not cause corrosion on the surface of the sintered NdFeB magnet, which meets the requirements for the reuse of electroplated defective products of the sintered NdFeB magnet. Realize the goal of zero product scrap.

Description

technical field [0001] The invention relates to a deplating solution for deplating a nickel-tungsten-phosphorus electroplating layer on the surface of a sintered NdFeB magnet, an application of the deplating solution and a deplating process, and belongs to the field of surface treatment of metal materials. Background technique [0002] NdFeB magnetic material, as the latest result of the development of rare earth permanent magnet materials, is known as the "Magnetic King" because of its excellent magnetic properties. At the same time, due to our country's rich resources and relatively low prices, it has been widely used in the fields of electronics, machinery, transportation, communications, national defense, medical treatment, petroleum, environmental protection, and agriculture in just a few years. However, due to its strong chemical activity, the surface is easily oxidized and corroded, resulting in changes in the surface and structure of the magnet, and a sharp drop in m...

AI Technical Summary

Problems solved by technology

The weakness of poor corrosion resistance of NdFeB magnets can be greatly improved by electroplating NiWP coatings, but some defective parts will inevitably appear in the process of industrial electroplating NiWP alloy coatings on NdFeB magnets in large quantities, and NdFeB magnets are expensive and expensive. Resources are scarce. In order to recycle the defective or waste products, it is necessary to remove the NiWP plating layer and re-plating

At present, most of the stripping solutions for removing the NiWP electroplating layer are for steel substrates. When this type of stripping solution is used for the NiWP electroplating layer on the surface of sintered NdFeB, it will cause too much damage to the sintered NdFeB substrate. , the intrinsic macroscopic size of the magnet changes too much, which will affect its reuse, or even make it impossible to reuse